Color
#21c8ed
#21c8edrgb(33, 200, 237)hsl(191, 85%, 53%)oklch(0.771 0.134 218.3)Colors that go with #21c8ed
Charcoal, Midnight Blue and Royal 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 #21c8ed: softer than #000 and cool enough to feel like part of the same palette.
Midnight Blue #191970
shipped7 real palettes, including Confluent's brand system and Telehealth put Midnight Blue beside #21c8ed, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21c8ed in 6 real palettes, including 1password's brand system and Confluent's brand system, as the accent.
Steel Blue #4682b4
shippedDesigners have shipped Steel Blue with #21c8ed: 4 real palettes, including Astro's brand system and Deep Water, as the lead colour.
Taupe #483c32
shippedTaupe is paired with #21c8ed in 10 real palettes, including Astro's brand system and Crayon Box, as the text colour against it.
Salmon #fa8072
complementarySalmon sits directly opposite #21c8ed on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Light Coral #f08080
split-complementshippedLight Coral is a split-complement of #21c8ed: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #21c8ed in 3 real palettes, including Blueprint and Salesforce's brand system, as the accent.
Real palettes that use #21c8ed
Tints & shades
Harmonies
Contrast
| #21c8ed as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.99:1 | fail | fail | fail | |
Aaon black | 10.55:1 | 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 #21c8ed as the background.
Brands using this color
Fonts for this mood
#21c8ed reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #21c8ed and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21c8ed-a2b6be-df4e7a-1f252d-e9f1ef?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