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Serialif Color
Serialif Color is a free REST API that converts a single color between keyword, HEX, RGB/RGBA and HSL/HSLA formats in one request, and returns its complementary color, a grayscale version, and the black-or-white text color that gives the best contrast against it. It is a solo hobby project by French developer Sebastien Filaire, needs no signup, and responds with plain JSON.
AuthenticationNone requiredCall it straight away — no key, no signup.
HTTPSSupportedTraffic is encrypted in transit.
CORSDisabledBrowser calls need a server-side proxy.
PricingFreeNo paid tier — free for the documented use case.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score88
Authentication25/25No authentication required
Pricing20/20Free to use
Docs14/20Documentation URL provided
Formats9/15Single response format
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/serialif-color/"><img src="https://greatapis.com/badge/serialif-color.svg" alt="Scored 88 on greatapis.com"></a>Auth quickstart
- No key needed — call it now.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.