Color
#3f9ff3
#3f9ff3rgb(63, 159, 243)hsl(208, 88%, 60%)oklch(0.685 0.153 248.6)Colors that go with #3f9ff3
Charcoal, Medium Sea Green and Tomato 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 #3f9ff3: softer than #000 and cool enough to feel like part of the same palette.
Medium Sea Green #3cb371
triadicshippedMedium Sea Green completes a triad with #3f9ff3 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #3f9ff3: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #3f9ff3 in 7 real palettes, including NBA's brand system and Heatwave, as the lead colour.
Blue #0000ff
shipped9 real palettes, including Unity's brand system and Qualcomm's brand system put Blue beside #3f9ff3, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #3f9ff3 in 4 real palettes, including Elastic's brand system and Learning App, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #3f9ff3: 9 real palettes, including Apple's brand system and Gopro's brand system, as the accent.
Gold #ffd700
shippedGold shows up next to #3f9ff3 in 4 real palettes, including Miro's brand system and Star Wars's brand system, as the lead colour.
Real palettes that use #3f9ff3
Tints & shades
Harmonies
Contrast
| #3f9ff3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.81:1 | fail | fail | fail | |
Aaon black | 7.46:1 | 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 #3f9ff3 as the background.
Brands using this color
Fonts for this mood
#3f9ff3 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 #3f9ff3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f9ff3-9cadc4-df4e51-1f212d-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