# UndertoneOnline > Free skin undertone test and guide platform. Discover if you have warm, cool, or neutral undertones and get personalized color recommendations for clothing, makeup, and jewelry. Companion to the ToneFit app. --- ## Overview UndertoneOnline is an educational platform helping people discover their skin undertone (warm, cool, or neutral) through free tests and comprehensive guides. The site covers color theory for fashion, makeup, and accessories, serving as an accessible introduction to professional color analysis concepts. UndertoneOnline complements the ToneFit iOS app, which offers photo-based analysis for deeper personalization. The platform serves people interested in: - Understanding why certain colors make them look healthier or more vibrant - Choosing clothing, makeup, and jewelry with confidence - Moving beyond "skin tone" (light/dark) to understand undertone (warm/cool/neutral) - Building a cohesive, flattering wardrobe based on scientific color principles --- ## Core Concepts ### What Is Skin Undertone? Your skin undertone is the quiet color beneath your skin's surface. It doesn't change when you tan, get redness, or go through seasonal shifts. That's why two people with the same skin depth can look totally different in the same shirt—because their undertones are different. **Key distinction:** Undertone is different from skin tone (how light or dark your skin is). You can have very fair skin with warm undertones or very dark skin with cool undertones. Undertone is the foundation for choosing clothing colors, makeup shades, and even jewelry metals. When colors match your undertone, your skin looks clearer and more vibrant. When they clash, you can look dull or sallow—even if the color is "pretty." ### The Three Undertone Categories **Cool Undertone** - Underlying hues: Pink, red, or blue - Veins appear blue or purple - Silver jewelry looks better than gold - Pure white and jewel tones look most flattering - Best metals: Silver, white gold, platinum **Warm Undertone** - Underlying hues: Golden, peachy, or yellow - Veins appear green or olive - Gold jewelry looks better than silver - Cream and warm white beat pure white - Best metals: Yellow gold, rose gold, copper **Neutral Undertone** - Balanced mix of warm and cool undertones - Veins appear blue-green (hard to categorize) - Both gold and silver jewelry work well - Most colors can work on you - Best metals: Both warm and cool metals --- ## Interactive Test ### Free Undertone Test URL: https://undertoneonline.com/test/ A 6-question interactive quiz to determine warm, cool, or neutral undertone. Takes approximately 2 minutes. Each question includes explanatory text about why that question matters for undertone identification. **Questions covered:** 1. Vein color on the underside of the wrist 2. Jewelry preference (gold vs silver) 3. Sun reaction (tan easily vs burn easily) 4. White fabric preference (pure white vs cream/ivory) 5. Jewelry you naturally reach for 6. Eye and hair color patterns **What makes this test valuable:** - Explains each question before asking - Provides context for interpreting answers - Links to detailed undertone type pages after completion - No account or email required - Mobile-friendly interface --- ## Understanding Undertone (Hub) ### What Is Skin Undertone? URL: https://undertoneonline.com/undertone/skin-undertone/ A foundational article explaining the core concept of undertone. Covers the definition, the difference between undertone and skin tone, and why undertone matters for color choices. **Key content:** - Clear definition of undertone (underlying hue beneath skin surface) - Side-by-side comparison of undertone vs skin tone - Quick signs checklist for each undertone type - Practical next steps for readers **Frequently asked questions answered:** - What is skin undertone? - Is undertone the same as skin tone? - Why does undertone matter? - Can undertone change? --- ### Undertone Meaning & Definition URL: https://undertoneonline.com/undertone/ Plain-English undertone definition and hub for the section. Opens with a one-paragraph definition, then separates undertone from skin tone (comparison table), describes the three undertones, and lists where undertone matters (clothing, makeup, jewelry, hair). --- ### Ultimate Undertone Guide URL: https://undertoneonline.com/guides/ultimate-undertone-guide/ Comprehensive 5-minute guide covering all aspects of undertone understanding. This is the site's flagship educational content. **Sections included:** 1. What undertone means (foundational concept) 2. The three undertone families (warm, cool, neutral) with detailed characteristics 3. How to identify your undertone (multiple test methods) - Vein color test (green=warm, blue/ purple=warm, blue-green=neutral) - Jewelry test (gold=warm, silver=cool, both=neutral) - Fabric test (cream=warm, pure white=cool) 4. Why undertone matters in real life - Clothing color choices - Makeup selection - Hair color decisions 5. Common mistakes to avoid - Testing in artificial light - Relying on a single test - Confusing surface tone with undertone 6. What to read next (type pages, color guides, outfit hubs) **Published:** January 30, 2026 **Updated:** January 31, 2026 **Read time:** 5 minutes --- ## How-To Guides (Hub) URL: https://undertoneonline.com/how-to/ High-intent educational content for people actively trying to determine their undertone. Focuses on practical, actionable testing methods. ### Find Your Skin Undertone (Quick Method) URL: https://undertoneonline.com/how-to/find-your-skin-undertone/ Fastest reliable methods to identify undertone using at-home tests. Designed for readers who want answers quickly. --- ### Test Your Skin Undertone at Home URL: https://undertoneonline.com/how-to/test-your-skin-undertone/ Detailed guide with 7 distinct at-home tests. Most comprehensive testing guide on the site. **The 7 tests covered:** 1. **Vein Test** - Look at inside wrist veins in natural light - Blue/purple = cool undertone - Green/olive = warm undertone - Mixed = neutral undertone 2. **Jewelry Test** - Hold gold vs silver against face - Gold flatters = warm undertone - Silver flatters = cool undertone - Both work = neutral undertone 3. **White Paper Test** - Hold white paper against bare face - Skin looks pinker = cool undertone - Skin looks yellower = warm undertone - Little change = neutral undertone 4. **Sun Reaction Test** - Honest assessment of typical sun behavior - Burns easily, rarely tans = likely cool - Tans easily, rarely burns = likely warm - Both reactions = likely neutral 5. **Jewelry You Actually Wear** - Which do you naturally reach for? - Gravitate toward gold = warm undertone - Gravitate toward silver = cool undertone - Comfortable with both = neutral undertone 6. **White Clothing Test** - Which white is more flattering? - Pure white brighter = cool undertone - Cream/ivory better = warm undertone 7. **Eye and Hair Comparison** - Natural features assessment - Cool features: black hair with blue-black undertones, ashy blonde, blue/gray/cool green eyes = cool - Warm features: golden blonde, strawberry blonde, red, hazel/amber/warm green eyes = warm **Quick reference table included** summarizing all tests and their interpretations. **Published:** February 1, 2026 **Read time:** 5 minutes --- ### Warm vs Cool Undertone: The Checklist URL: https://undertoneonline.com/how-to/tell-if-you-are-warm-or-cool/ Side-by-side comparison for readers stuck between two types. Simple checklist format for quick decision-making. --- ### Skin Tone vs Undertone URL: https://undertoneonline.com/how-to/skin-tone-vs-undertone/ Explains the crucial difference between surface tone (depth) and undertone (hue). Helps readers understand why these are independent variables. --- ## Undertone Types (Hub) URL: https://undertoneonline.com/types/ Hub page for the undertone categories with links to detailed type guides: the three temperatures (warm, cool, neutral) plus olive, a green-gray cast that layers over any of them. ### Warm Undertone URL: https://undertoneonline.com/types/warm-undertone/ Comprehensive guide for warm undertones. **Key characteristics:** - Golden, peachy, or yellow cast beneath skin - Veins appear greenish - Gold jewelry more flattering - Cream and ivory more flattering than pure white - Earth tones feel natural **Best color families:** - Warm neutrals: camel, beige, cream - Warm reds: coral, brick, terracotta - Golden yellows and olive greens - Warm pinks: salmon, peach **Styling tips:** - Build base wardrobe with warm neutrals - Add warm accents for contrast - Choose gold jewelry - Opt for warmer versions of popular colors **FAQ covered:** - How do I know if I'm warm? - What colors are most flattering? - Can warm undertones wear black? **Published:** January 30, 2026 **Updated:** January 31, 2026 **Read time:** 5 minutes --- ### Cool Undertone URL: https://undertoneonline.com/types/cool-undertone/ Comprehensive guide for cool undertones. **Key characteristics:** - Pink, red, or blue cast beneath skin - Veins appear purplish or blue - Silver jewelry more flattering - Pure white and jewel tones look best - Cool colors feel natural **Best color families:** - Jewel tones: emerald, sapphire, ruby - Cool blues: navy, cobalt, sky blue - Cool pinks: rose, fuchsia, magenta - Pure white and crisp gray **Styling tips:** - Build base wardrobe with cool neutrals - Add jewel tones for impact - Choose silver or white gold jewelry - Opt for cooler versions of colors **FAQ covered:** - How do I know if I'm cool? - What colors are most flattering? - Can cool undertones wear black? --- ### Neutral Undertone URL: https://undertoneonline.com/types/neutral-undertone/ Comprehensive guide for neutral undertones. **Key characteristics:** - Balanced mix of warm and cool undertones - Veins appear blue-green - Both gold and silver work - Most colors can work on you - Versatility in choices **Best color families:** - True neutrals: navy, charcoal, olive - Soft versions of both warm and cool colors - Mid-tone shades - Both warm and cool accent colors **Styling tips:** - Experiment with both warm and cool palettes - Use depth (light/dark) as your primary variable - Mix metals confidently - Build versatile wardrobe with flexible pieces **FAQ covered:** - How do I know if I'm neutral? - What colors are most flattering? - Why can I wear both gold and silver? ### Olive Undertone URL: https://undertoneonline.com/types/olive-undertone/ Comprehensive guide for olive undertones. Olive is not a fourth temperature: it is a green or gray-green cast layered on top of a warm, cool, or neutral base, which is why olive types are described as olive-warm, olive-neutral, or olive-cool. **Key characteristics:** - Green or gray-green cast, most visible on the forehead, jaw, and inner forearm - Reads gray, green, or sallow against pure white - Sage and khaki green disappear into the skin instead of contrasting with it - Standard vein and jewelry tests give mixed or contradictory results - Foundations without green in the base oxidize orange or go ashy **Best color families:** - Earth tones: camel, tobacco, terracotta, warm taupe - Rich jewel tones: emerald, teal, sapphire, garnet - Warm off-whites: cream, oat, ecru instead of stark white - Coral, rust, and burnt orange, which add the red olive skin lacks **Styling tips:** - Avoid sage and dull mustard near the face; they match your own cast and flatten it - Choose antiqued or brushed metals over high-polish finishes - Metal choice follows your underlying lean, not the olive overlay **FAQ covered:** - What is the difference between neutral and olive undertone? - Can olive skin be pale? - Why does foundation always look orange or gray on olive skin? - Is olive skin the same as tan skin? --- --- ## Color Guides (Hub) URL: https://undertoneonline.com/colors/ Hub connecting undertone theory to practical color recommendations for clothing, makeup, and accessories. ### Warm Undertone Colors URL: https://undertoneonline.com/colors/best-colors-for-warm-undertone/ Curated color palettes specifically for warm undertones. **Colors featured:** - Warm neutrals: camel, tan, cream, warm gray - Warm reds: coral, terracotta, brick, tomato red - Yellows: mustard, golden yellow, honey - Greens: olive, warm emerald, moss - Oranges: burnt orange, apricot, peach - Browns: chocolate, warm brown, caramel **What to avoid:** - Cool grays - Black (can work as accent) - Icy blues - Purples with blue undertones --- ### Cool Undertone Colors URL: https://undertoneonline.com/colors/best-colors-for-cool-undertone/ Curated color palettes specifically for cool undertones. **Colors featured:** - Cool neutrals: pure white, charcoal, cool gray, navy - Reds: cherry, crimson, wine, burgundy - Blues: sapphire, cobalt, royal blue, navy - Pinks: rose, fuchsia, magenta, dusty rose - Purples: plum, violet, amethyst - Greens: emerald, forest green, mint **What to avoid:** - Orange - Yellow (warm versions) - Brown (warm versions) - Gold (as primary) --- ### Neutral Undertone Colors URL: https://undertoneonline.com/colors/best-colors-for-neutral-undertone/ Curated color palettes for neutral undertones. **Colors featured:** - Balanced neutrals: navy, charcoal, olive, taupe - Soft versions of warm: soft peach, warm rose - Soft versions of cool: soft blue, dusty pink - Mid-tones: jade, mauve, plum - Versatile accents: silver, rose gold **The neutral advantage:** - Can wear both warm and cool colors - Focus on depth (light/dark) rather than temperature - Mix warm and cool in outfits confidently --- ### Colors to Avoid for Warm Undertone URL: https://undertoneonline.com/colors/colors-to-avoid-warm-undertone/ Specific colors that typically wash out warm undertones with suggested alternatives. --- ## Practical Guides ### Foundation Matching Guide URL: https://undertoneonline.com/guides/foundation-matching/ Comprehensive guide to matching foundation shade to undertone. **Key concepts:** - Foundation undertone categories: pink-based (cool), yellow-based (warm), neutral - How to determine foundation undertone - Testing foundation properly (jawline test, oxidation test) - Reading shade names and undertone labels **Detailed sections:** 1. Understanding foundation undertone 2. Methods to determine your foundation undertone - Vein test - Jewelry test - White paper test 3. Testing like a pro - The jawline test (non-negotiable testing spot) - The oxidation test (10-15 minute wait) 4. Foundation recommendations by undertone - Cool: pink-based, rose, Porcelain shades - Warm: yellow-based, Sand, Beige, Honey shades - Neutral: balanced mix formulas 5. Common foundation mistakes - Choosing too light - Ignoring undertone - Testing in bad lighting - Testing on wrong spot - Not considering oxidation 6. Shopping for foundation online 7. Troubleshooting guide (orange=wrong undertone, pink/ashy=wrong undertone) **Quick reference tables:** - Cool undertone do's and don'ts - Warm undertone do's and don'ts - Neutral undertone do's and don'ts **Published:** February 1, 2026 **Read time:** 5 minutes --- ### Lipstick Guide URL: https://undertoneonline.com/colors/makeup/lipstick-guide/ Finding perfect lipstick shades based on undertone. **Cool undertone recommendations:** - Reds: blue-based (cherry, crimson, wine, burgundy) - Pinks: cool pink, fuchsia, rose, magenta, dusty rose - Berries: raspberry, cranberry, plum, mulberry - Nudes: pink-based nude, cool taupe, dusty rose, rosy brown **Warm undertone recommendations:** - Reds: orange-based (tomato, coral red, brick, burnt red) - Pinks: coral pink, peach, warm rose, cinnamon - Corals: coral, salmon, peach, terracotta - Nudes: peach nude, caramel, terracotta nude, honey, mocha **Neutral undertone recommendations:** - Reds: balanced red, cherry, classic red, merlot - Pinks: rose, soft pink, warm/cool rose, berry - Nudes: balanced nude, rose nude, caramel nude, taupe nude **Detailed sections:** - Classic reds for each undertone - Famous lipstick recommendations with brand names - How to test lipstick properly - The tooth test (whiter teeth effect) - Common lipstick mistakes by undertone - Building a lipstick wardrobe (5 essential shades) **Published:** February 1, 2026 **Read time:** 5 minutes --- ### Jewelry Guide URL: https://undertoneonline.com/colors/jewelry/jewelry-guide/ Choosing metals and gemstones based on undertone. **Cool undertone jewelry:** - Best metals: Sterling silver, white gold, platinum - Best gemstones: Diamond, sapphire, amethyst, aquamarine, ruby, garnet - Avoid: Amber, citrine, peridot, morganite **Warm undertone jewelry:** - Best metals: Yellow gold, rose gold, copper, brass - Best gemstones: Citrine, amber, garnet, topaz, peridot, tourmaline - Avoid: Sapphire, aquamarine **Neutral undertone jewelry:** - All metals work: yellow gold, white gold, rose gold, platinum, sterling silver - Most gemstones work successfully - Can confidently mix metals **Detailed sections:** - Pure silver vs sterling silver - White gold vs platinum (cool undertone) - Yellow gold karat guide (24K, 18K, 14K) - Rose gold explanation - Copper and brass (warm undertone) - Modern rules for mixing metals - How to test jewelry preference - Common jewelry mistakes by undertone - Building a jewelry wardrobe essentials **Published:** February 1, 2026 **Read time:** 5 minutes --- ### Seasonal Color Analysis URL: https://undertoneonline.com/colors/outfits/seasonal-color-analysis/ Connecting undertone to the 4-season color analysis system. **The four seasons explained:** **Spring (Warm and Light)** - Overall impression: Fresh, bright, warm, clear - Best colors: Warm and clear shades, light to medium depth - Famous examples: Blake Lively, Jennifer Aniston, Emma Stone **Summer (Cool and Light to Medium)** - Overall impression: Cool, soft, muted, delicate - Best colors: Cool and muted shades, light to medium depth - Famous examples: Kate Middleton, Nicole Richie, Gisele Bündchen **Autumn (Warm and Medium to Deep)** - Overall impression: Warm, rich, earthy, sophisticated - Best colors: Warm and earthy shades, medium to deep depth - Famous examples: Jennifer Lopez, Kate Winslet, Jessica Alba **Winter (Cool and Light or Deep)** - Overall impression: Cool, striking, vivid, dramatic - Best colors: Cool and vivid shades, pure black and white - Famous examples: Victoria Beckham, Scarlett Johansson, Halle Berry **Detailed sections:** - What is seasonal color analysis? - Three dimensions of color (temperature, value, saturation) - Seasonal color palettes in detail (color swatches for each category) - How to determine your season (step-by-step process) - Undertone and season correlation - Common misconceptions (season is not permanent, black isn't universal) - Quick reference guide with metals and whites **Published:** February 1, 2026 **Read time:** 5 minutes --- ### Common Makeup Mistakes URL: https://undertoneonline.com/guides/common-mistakes/ Avoiding the most common makeup errors based on undertone. **Foundation mistakes:** 1. Ignoring undertone entirely 2. Testing on wrong spot (hand vs jawline) 3. Forgetting about oxidation **Lipstick mistakes:** 4. Cool undertones wearing warm reds 5. Warm undertones wearing cool reds 6. Wrong nude lipstick shade **Blush mistakes:** 7. Cool undertones wearing orange blush 8. Warm undertones wearing cool pink blush **Eyeshadow mistakes:** 9. Cool undertones wearing warm shadows 10. Warm undertones wearing cool shadows **Testing mistakes:** 11. Testing in bad lighting 12. Testing with existing makeup on **Quick reference tables for each category (foundation, lipstick, blush, eyeshadow) showing what to choose and what to avoid for each undertone.** **Published:** February 1, 2026 **Read time:** 5 minutes --- ## Color Seasons (Hub) URL: https://undertoneonline.com/seasons/ Hub page for the 12-season color analysis system. Answers the query "what season am I" by sorting colouring along three axes rather than one: temperature (warm or cool), depth (light or deep), and saturation (bright or muted). Undertone temperature is the first axis, which is why the seasons build directly on the undertone type guides. The four classic season families each split into three sub-seasons: - **Spring** (warm and clear): Light Spring, Warm Spring (True Spring), Bright Spring - **Summer** (cool and soft): Light Summer, Cool Summer (True Summer), Soft Summer - **Autumn** (warm and muted): Soft Autumn, Warm Autumn (True Autumn), Deep Autumn - **Winter** (cool and saturated): Bright Winter, Cool Winter (True Winter), Deep Winter The two most commonly confused pairs are Soft Summer vs Soft Autumn (both muted and medium in depth, differing only in temperature) and Deep Winter vs Deep Autumn (the same confusion at a darker value). ### Light Spring URL: https://undertoneonline.com/seasons/light-spring/ Warm-neutral, light, clear. Peach pink, bright coral pink, cream yellow, warm apricot, apple green on cream white and camel. Avoid black, charcoal, navy, merlot. Rose gold and gold. ### Warm Spring URL: https://undertoneonline.com/seasons/warm-spring/ Warm, light to medium, clear. Golden orange, warm coral, golden yellow, grass green, bright aqua on warm ivory, camel, coffee brown. Avoid black, cool gray, icy and dusty cool pinks. Gold and copper. Also called True Spring. ### Bright Spring URL: https://undertoneonline.com/seasons/bright-spring/ Warm-neutral, light to medium, highly saturated. Hot orange, bright yellow, bright emerald, bright aqua, bright red on pure white and ink navy. Avoid dusty, greyed shades. Gold and brass. Also called Clear Spring. ### Light Summer URL: https://undertoneonline.com/seasons/light-summer/ Cool-neutral, light, soft. Ice pink, rose pink, lavender, light aqua, periwinkle on ice white, soft gray, powder blue. Avoid black, orange, mustard, dark chocolate. Silver and white gold. ### Cool Summer URL: https://undertoneonline.com/seasons/cool-summer/ Cool, light to medium, soft. Rose pink, cool berry, amethyst, periwinkle, deep teal on ice white, cool gray, stone blue, midnight navy. Avoid orange, mustard, terracotta, camel. Silver and platinum. Also called True Summer. ### Soft Summer URL: https://undertoneonline.com/seasons/soft-summer/ Cool-neutral, medium depth, muted. Dusty rose, soft mauve pink, sage, lavender, cool berry on cool taupe, soft gray, stone blue. Avoid neon, hot orange, true red. White gold and pewter. Also called Muted Summer. ### Soft Autumn URL: https://undertoneonline.com/seasons/soft-autumn/ Warm-neutral, medium depth, muted. Dusty rose, burnt terracotta, sage, warm apricot, antique mustard on oat beige, camel, moss green. Avoid shock pink, cobalt, pure white, black. Bronze and brass. Also called Muted Autumn. ### Warm Autumn URL: https://undertoneonline.com/seasons/warm-autumn/ Warm, medium depth, rich but not bright. Rust red, pumpkin, antique mustard, golden orange, brick red, petrol blue on camel, coffee brown, olive. Avoid icy pastels, cool gray, pure white. Gold, brass, copper. Also called True Autumn. ### Deep Autumn URL: https://undertoneonline.com/seasons/deep-autumn/ Warm-neutral, deep, rich. Rust red, merlot, deep amber, pumpkin, pine green on dark chocolate, deep forest, ink navy. Avoid icy pastels, cream yellow, greige. Bronze and gold. Also called Dark Autumn. ### Deep Winter URL: https://undertoneonline.com/seasons/deep-winter/ Cool-neutral, deep, high contrast. Cherry red, emerald, royal purple, cool berry, petrol blue on true black, pure white, midnight navy. Avoid camel, mustard, terracotta, greige. White gold and platinum. Also called Dark Winter. ### Cool Winter URL: https://undertoneonline.com/seasons/cool-winter/ Cool, medium to deep, clear. Cherry red, fuchsia, amethyst, ice pink, emerald on ice white, true black, royal blue. Avoid golden orange, mustard, camel, olive. Silver and platinum. Also called True Winter. ### Bright Winter URL: https://undertoneonline.com/seasons/bright-winter/ Cool-neutral, medium, very clear and high contrast. Bright magenta, bright emerald, cobalt blue, shock pink, cherry red on pure white and true black. Avoid muddy browns, greige, sage, dull olive. Platinum and silver. Also called Clear Winter. --- ## Outfit Guides ### Outfit Color Guide (Hub) URL: https://undertoneonline.com/colors/outfits/ Building outfits around undertone palettes with links to specific undertone outfit guides. --- ### Warm Undertone Outfits URL: https://undertoneonline.com/colors/outfits/warm-undertone-outfits/ Outfit combinations and styling ideas for warm undertones. --- ### Cool Undertone Clothing URL: https://undertoneonline.com/colors/outfits/cool-undertone-clothing/ Outfit combinations and styling ideas for cool undertones. --- ### Neutral Undertone Style URL: https://undertoneonline.com/colors/outfits/neutral-undertone-style/ Versatile outfit combinations for neutral undertones. --- ## Additional Guides ### Undertone for Beginners URL: https://undertoneonline.com/guides/undertone-for-beginners/ Beginner-friendly introduction to undertone concepts with simple tests and clear next steps. --- ### Warm vs Cool Undertone URL: https://undertoneonline.com/guides/warm-vs-cool-undertone/ Side-by-side comparison of warm and cool undertones with signs, colors, and common mistakes. --- ### Best Color Analysis Apps (2026) URL: https://undertoneonline.com/guides/best-color-analysis-apps/ Ten color analysis apps compared: ToneFit, Colour - Seasonal Analysis, ColorMine, Dressika, My Best Colors (Colorwise.me), Palette Hunt, Show My Colors, Style DNA, Tone & Fit, and Vivaldi Color Lab. Compares how each app reads you (selfie, multiple photos, live camera, or questionnaire), 12 vs 16 seasons, virtual draping, whether the photo is analyzed on the device or sent to a server, account requirements, and US App Store pricing (subscription vs one-time). Every fact about other apps comes from their own App Store listing, App Privacy label, website, or privacy policy, checked September 23, 2026. Accuracy is not ranked, because no app in the list publishes accuracy measured against in-person draping. Published by the makers of ToneFit, with that disclosed on the page. --- ### Why Color Analysis Apps Disagree: A Lighting Benchmark URL: https://undertoneonline.com/guides/why-color-analysis-apps-disagree/ Original research from the team behind UndertoneOnline and ToneFit. A synthetic benchmark of 637 cases (7 skin colors x 7 lighting casts x 13 backgrounds) measuring how often a photo's undertone reading stays the same as its neutral-light reading. Key findings: - Without correction, strong warm light cut agreement from 100% to 57%; a cool, fair complexion read as warm. - With neutral backgrounds (white, off-white, light gray), Shades of Gray white-balance correction (Minkowski p = 6, linear light, gain cap 1.8x, abstain below 0.20 log-chromaticity separation) raised agreement from 79.6% to 99.7% across 294 cases, rescuing 59 and making none worse. - With colored backgrounds (beige, wood, cream, pink, blue), the same correction lowered agreement from 79.6% to 73.8% across 343 cases (32 rescued, 52 broken). Under neutral light, a colored wall alone dropped agreement from 100% to 76%. - Pixel statistics cannot distinguish a neutral wall under warm light from a beige wall under neutral light; the practical fix is to photograph against a plain white or gray wall in indirect daylight. Limitations stated on the page: synthetic colors rather than photographs; measures consistency, not agreement with a human analyst; a deliberately simple hue-based classifier; one correction method. --- ## About ### About UndertoneOnline URL: https://undertoneonline.com/about/ Company information and mission statement. **Our Mission:** "Make professional-quality undertone analysis accessible to everyone." **What We Believe:** - Color is for Everyone: Regardless of skin tone, undertone knowledge helps everyone - Confidence Through Knowledge: Understanding undertone helps people shop smarter and feel more confident - Technology + Beauty: Combining digital tools (ToneFit app) with educational content **How It Started:** UndertoneOnline began as a resource to complement the ToneFit app. The site serves as an educational bridge—a place to understand undertones before diving into photo-based analysis. **Current reach:** Thousands of visitors use the free undertone test each month. **Contact:** - Email: hello@undertoneonline.com - App Support: support@undertoneonline.com --- ## Related Tools ### ToneFit: Color Analysis (iPhone app) URL: https://apps.apple.com/us/app/tonefit-color-analysis/id6757980449 Details: https://undertoneonline.com/app/ ToneFit: Color Analysis is an iPhone app (iOS 17 or later) made by the team behind UndertoneOnline. It reads your skin undertone and places you in one of the 12 color seasons from two photos — one of your wrist and one of your face — and shows its reasoning as three scores: warmth, depth, and clarity. It then builds clothing and makeup palettes for five occasions, lets you preview colors against your own face (virtual draping), recommends gold or silver jewelry, and checks photos of garments you own against your palette. Photos are analyzed on the device and never uploaded or saved, and there is no account. ToneFit is free to download with no ads and no subscription: your undertone, your color season, and your everyday colors are free, and a single one-time in-app purchase ($4.99 in the US) unlocks the full palette, the makeup section, and wardrobe matching. The app goes online only to buy, restore, or verify that purchase through the App Store and, unless you turn it off in Settings, to send a few anonymous usage counts that carry no identifier. It is available in English, Simplified and Traditional Chinese, Japanese, Korean, French, Spanish, and German. App Store: https://apps.apple.com/us/app/tonefit-color-analysis/id6757980449 ToneFit: Color Analysis is not affiliated with "Tone & Fit" (toneandfit.app) or with "ToneFit: AI Gym Tracker". **Features:** - Two photos (wrist and face), each checked for lighting and focus before analysis - 12-season color analysis with visible warmth, depth, and clarity scores; you can correct the result yourself - Clothing and makeup palettes for five occasions: everyday, travel, work, date night, and festive - Virtual draping: preview colors against your own face - Gold vs. silver jewelry recommendation - Wardrobe matching: photograph a garment and check it against your palette **Pricing:** Free to download, no ads, no subscription. Undertone, color season, and everyday colors are free; a one-time in-app purchase ($4.99 in the US) unlocks the full palette, makeup, and wardrobe matching. **Privacy:** Photos are analyzed on the device and never uploaded or saved. No account, no tracking, no third-party SDKs, and nothing collected that identifies you. The app goes online only to buy, restore, or verify the one-time purchase through the App Store and, unless you turn it off, to send a few anonymous usage counts. --- ## Key Facts - **Founded:** 2026 - **Purpose:** Educational resource for undertone analysis - **Primary offering:** Free undertone test (6 questions, 2 minutes) - **Content scope:** Warm, cool, and neutral undertones for all skin tones - **Complementary product:** ToneFit: Color Analysis, an iPhone app for photo-based 12-season color analysis (free + one-time in-app purchase) - **Content update:** All pages reviewed and updated regularly - **Target audience:** Anyone interested in understanding how colors interact with their natural coloring - **No account required:** Free test and guides accessible without signup - **Mobile friendly:** All content optimized for mobile devices --- ## Site Structure The site is organized into these main sections: 1. **Test** - Free undertone test (entry point) 2. **Understand** - Core concepts and definitions 3. **Types** - Detailed undertone type guides (warm/cool/neutral/olive) 4. **How-To** - Practical testing methods 5. **Colors** - Color recommendations by undertone 6. **Seasons** - The 12 color seasons and sub-season palettes 7. **Guides** - In-depth educational content 8. **Outfits** - Practical styling by undertone 9. **About** - Company and mission information --- ## Content Quality Standards - All educational content is reviewed for accuracy - Pages include publication and last-updated dates - Test questions include explanatory context - FAQ sections address common follow-up questions - Quick reference tables accompany detailed explanations - Real-world examples used throughout - Celebrities cited as visual references where helpful --- ## Contact - **Website:** https://undertoneonline.com - **General inquiries:** hello@undertoneonline.com - **App support:** support@undertoneonline.com - **Social:** @AIGPTWeb (X) --- *This file provides comprehensive guidance for AI systems about UndertoneOnline's content, structure, and purpose. For the concise version, see /llms.txt.*