Color
#3f9cd9
#3f9cd9rgb(63, 156, 217)hsl(204, 67%, 55%)oklch(0.664 0.126 241.2)Colors that go with #3f9cd9
Charcoal, Tomato and Bronze 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 #3f9cd9: softer than #000 and cool enough to feel like part of the same palette.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #3f9cd9: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Bronze #cd7f32
complementaryshippedBronze sits directly opposite #3f9cd9 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 #3f9cd9 in 9 real palettes, including Salesforce's brand system and Heatwave, as the accent.
Blue #0000ff
shipped6 real palettes, including Unity's brand system and Qualcomm's brand system put Blue beside #3f9cd9, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #3f9cd9 in 5 real palettes, including NASCAR's brand system and Riot Games's brand system, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #3f9cd9 in 4 real palettes, including Elastic's brand system and Learning App, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #3f9cd9: 11 real palettes, including Gopro's brand system and Coca-Cola's brand system, as the lead colour.
Real palettes that use #3f9cd9
Tints & shades
Harmonies
Contrast
| #3f9cd9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.01:1 | fail | pass | fail | |
Aaon black | 6.97:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3f9cd9 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
#3f9cd9 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 #3f9cd9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f9cd9-9cafc4-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