Color
#51b7fb
#51b7fbrgb(81, 183, 251)hsl(204, 96%, 65%)oklch(0.748 0.136 241.2)Colors that go with #51b7fb
Charcoal, Dark Orange and Amber 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 #51b7fb: softer than #000 and cool enough to feel like part of the same palette.
Dark Orange #ff8c00
complementaryshippedDark Orange sits directly opposite #51b7fb on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #51b7fb in 5 real palettes, including Blueprint and Salesforce's brand system, as the accent.
Blue #0000ff
shipped5 real palettes, including Warp's brand system and Canva's brand system put Blue beside #51b7fb, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #51b7fb: 6 real palettes, including Venmo's brand system and Coca-Cola's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #51b7fb: 4 real palettes, including Venmo's brand system and Figma's brand system, as the lead colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #51b7fb in 4 real palettes, including Terminal and Telehealth, as the lead colour.
Midnight Blue #191970
shipped9 real palettes, including Kraken's brand system and Blue Mono put Midnight Blue beside #51b7fb, as the lead colour.
Real palettes that use #51b7fb
Tints & shades
Harmonies
Contrast
| #51b7fb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.21:1 | fail | fail | fail | |
Aaon black | 9.52:1 | 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 #51b7fb as the background.
Brands using this color
Fonts for this mood
#51b7fb 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 #51b7fb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51b7fb-9cafc4-df4e5a-1f222d-e9f1f0?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