Color
#51aefb
#51aefbrgb(81, 174, 251)hsl(207, 96%, 65%)oklch(0.728 0.143 246.5)Colors that go with #51aefb
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 #51aefb: softer than #000 and cool enough to feel like part of the same palette.
Dark Orange #ff8c00
complementaryshippedDark Orange sits directly opposite #51aefb 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 #51aefb in 7 real palettes, including NBA's brand system and Salesforce's brand system, as the lead colour.
Blue #0000ff
shipped5 real palettes, including Warp's brand system and Canva's brand system put Blue beside #51aefb, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #51aefb: 8 real palettes, including Venmo's brand system and Coca-Cola's brand system, as the accent.
Gold #ffd700
shippedGold shows up next to #51aefb in 4 real palettes, including Prime Video's brand system and Miro's brand system, as the lead colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #51aefb in 4 real palettes, including Terminal and Spotify's brand system, as the lead colour.
Midnight Blue #191970
shipped9 real palettes, including Blue Mono and Kraken's brand system put Midnight Blue beside #51aefb, as the text colour against it.
Real palettes that use #51aefb
Tints & shades
Harmonies
Contrast
| #51aefb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.39:1 | fail | fail | fail | |
Aaon black | 8.8:1 | 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 #51aefb as the background.
Brands using this color
Fonts for this mood
#51aefb 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 #51aefb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51aefb-9cadc4-df4e53-1f212d-e9f1f1?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