Color
#51bbdb
#51bbdbrgb(81, 187, 219)hsl(194, 66%, 59%)oklch(0.743 0.107 221)Colors that go with #51bbdb
Charcoal, Dark Salmon and Denim 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 #51bbdb: softer than #000 and cool enough to feel like part of the same palette.
Dark Salmon #e9967a
complementaryshippedDark Salmon sits directly opposite #51bbdb on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Denim #1560bd
shippedDesigners have shipped Denim with #51bbdb: 5 real palettes, including Coca-Cola's brand system and UEFA's brand system, as the accent.
Midnight Blue #191970
shipped8 real palettes, including Confluent's brand system and First Snow put Midnight Blue beside #51bbdb, as the lead colour.
Periwinkle #ccccff
shippedPeriwinkle shows up next to #51bbdb in 4 real palettes, including Mistral AI's brand system and Calendly's brand system, as the accent.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #51bbdb: 5 real palettes, including First Snow and Calendly's brand system, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #51bbdb in 9 real palettes, including Confluent's brand system and Elastic's brand system, as the supporting colour.
Slate Gray #708090
shipped4 real palettes, including Still Water and Graphite put Slate Gray beside #51bbdb, as the lead colour.
Real palettes that use #51bbdb
Tints & shades
Harmonies
Contrast
| #51bbdb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.21:1 | fail | fail | fail | |
Aaon black | 9.48:1 | 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 #51bbdb as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#51bbdb 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 #51bbdb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51bbdb-9cb6c4-df4e72-1f242d-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