> For the complete documentation index, see [llms.txt](/llms.txt).
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# Dev API

5 endpoints — Same auth, same credit pool, same JSON envelope. Use them directly from apps, content sites, workflows, or agents without rebuilding formulas, validation, and docs for each tool.
[Start free →](/billing/checkout/?plan=free) [View OpenAPI](/v1/docs) [All categories](/tools/)
Color
[
CMYK to Hex Converter cmyk-to-hex-converter
Convert CMYK percentages to RGB, HEX, HSL, HSV, and contrast text color.
1cr · v2026-04-22
](/tools/cmyk-to-hex-converter/) [
Hex to CMYK Converter hex-to-cmyk-converter
Convert a hex color to CMYK print percentages.
1cr · v2026-04-22
](/tools/hex-to-cmyk-converter/) [
Hex to RGB Converter hex-to-rgb-converter
Convert a hex color to RGB, HSL, CMYK, and contrast metrics.
1cr · v2026-04-22
](/tools/hex-to-rgb-converter/) [
RGB to Hex Converter rgb-to-hex-converter
Convert RGB channels to hex, HSL, HSV, CMYK, and relative luminance.
1cr · v2026-04-22
](/tools/rgb-to-hex-converter/)
Encoding
[
Base64 Decoder base64-decoder
Decode standard or URL-safe Base64 text and return byte and character analysis.
1cr · v2026-04-22
](/tools/base64-decoder/)
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