Color
#51bda4
#51bda4rgb(81, 189, 164)hsl(166, 45%, 53%)oklch(0.728 0.106 175.5)Colors that go with #51bda4
Charcoal, Hot Pink and 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 #51bda4: softer than #000 and cool enough to feel like part of the same palette.
Hot Pink #ff69b4
complementaryshippedHot Pink sits directly opposite #51bda4 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped5 real palettes, including Unity's brand system and Canva's brand system put Blue beside #51bda4, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #51bda4 in 4 real palettes, including DuckDuckGo's brand system and Riot Games's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #51bda4: 4 real palettes, including Unity's brand system and Playground, as the lead colour.
Midnight Blue #191970
shipped7 real palettes, including Fintech Trust and Ford's brand system put Midnight Blue beside #51bda4, as the text colour against it.
Mustard Yellow #ffdb58
shipped6 real palettes, including Crayon Box and Fresh Juice put Mustard Yellow beside #51bda4, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #51bda4 in 4 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Real palettes that use #51bda4
Tints & shades
Harmonies
Contrast
| #51bda4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.29:1 | fail | fail | fail | |
Aaon black | 9.16:1 | 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 #51bda4 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #51bda4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51bda4-a2bebb-d459b1-1f2a2d-e9f1ec?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