Free Color Tools, Generators and Converters for Developers and Designers

AI Tools: the AI Cost Calculator shows what an app that uses AI would cost a month on every Claude, GPT, Gemini, Grok, Mistral and DeepSeek model, from prices updated every day. Color Tools: the Color Explorer reads any hex in every color space, finds the nearest RAL Classic color, checks WCAG and APCA contrast and simulates color blindness. The Contrast Checker tests a text and background pair for AA and AAA and finds the closest colors that pass, and the Color Blindness Simulator shows any picture through eight color vision deficiencies. Generators: build color palettes and CSS gradients and turn them into procedural wallpapers. Converters: 30 converters between HEX and RGB, HSL, HSV, HWB, CMYK, OKLAB, OKLCH, CIELAB, CIELCH, CIELUV, Display P3, XYZ, Yxy and Hunter Lab, both ways. Everything Codigrate uses to build its IDE themes, free for you to use too.