Color
#51bbbd
#51bbbdrgb(81, 187, 189)hsl(181, 45%, 53%)oklch(0.732 0.097 197)Colors that go with #51bbbd
Charcoal, Blue and Crimson 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 #51bbbd: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped4 real palettes, including Canva's brand system and Unity's brand system put Blue beside #51bbbd, as the accent.
Crimson #dc143c
shippedCrimson is paired with #51bbbd in 4 real palettes, including Riot Games's brand system and Tiffany & Co.'s brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #51bbbd: 5 real palettes, including Open House and Coca-Cola's brand system, as the lead colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #51bbbd: 5 real palettes, including Patreon's brand system and Unity's brand system, as the accent.
Midnight Blue #191970
shipped9 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #51bbbd, as the lead colour.
Mustard Yellow #ffdb58
shipped4 real palettes, including Crayon Box and Lido put Mustard Yellow beside #51bbbd, as the accent.
Light Coral #f08080
complementaryLight Coral sits directly opposite #51bbbd 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 #51bbbd
Tints & shades
Harmonies
Contrast
| #51bbbd as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.28:1 | fail | fail | fail | |
Aaon black | 9.19:1 | 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 #51bbbd as the background.
Brands using this color
Fonts for this mood
#51bbbd reads as cool, modern. 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 #51bbbd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51bbbd-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