Crayon Box
Open in tool →Red, teal and yellow at crayon saturation — joyful, but on white with black type so it stays readable for grown-ups.
Color
#21c7ca
#21c7ca
hex
#21c7cargb
rgb(33, 199, 202)hsl
hsl(181, 72%, 46%)oklch
oklch(0.755 0.124 196.9)Closest name: darkturquoise (#00ced1)Relative luminance 0.4543
Colors that go with #21c7ca
Charcoal, Dodger Blue and Midnight Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #21c7ca: softer than #000 and cool enough to feel like part of the same palette.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #21c7ca: 4 real palettes, including Patreon's brand system and Figma's brand system, as the accent.
Midnight Blue #191970
shipped6 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #21c7ca, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21c7ca in 7 real palettes, including Khan Academy's brand system and Confluent's brand system, as the accent.
Steel Blue #4682b4
shippedDesigners have shipped Steel Blue with #21c7ca: 4 real palettes, including Deep Water and Ford's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #21c7ca in 13 real palettes, including Crayon Box and Resort, as the text colour against it.
Tomato #ff6347
shipped4 real palettes, including Crayon Box and Fresh Juice put Tomato beside #21c7ca, as the lead colour.
Light Coral #f08080
complementaryLight Coral sits directly opposite #21c7ca on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #21c7ca
Tints & shades
Harmonies
Contrast
| #21c7ca as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.08:1 | fail | fail | fail | |
Aaon black | 10.09:1 | pass | pass | pass | Passes AAA — no fix needed. |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21c7ca as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#21c7ca reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21c7ca
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #21c7ca and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21c7ca-a2babe-d45992-1f272d-e9f1ed?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md