Color
#3f55fd
#3f55fdrgb(63, 85, 253)hsl(233, 98%, 62%)oklch(0.547 0.247 269.8)Colors that go with #3f55fd
Charcoal, Crimson and Sea Green 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 #3f55fd: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #3f55fd — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3f55fd — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #3f55fd in 6 real palettes, including Walmart's brand system and Mastodon hosted on mastodon.social's brand system, as the accent.
Blue #0000ff
shipped9 real palettes, including Signal's brand system and Dropbox's brand system put Blue beside #3f55fd, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3f55fd: 9 real palettes, including Nivea's brand system and Nokia's brand system, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #3f55fd: 7 real palettes, including Roblox's brand system and Webflow's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #3f55fd: 4 real palettes, including Elastic's brand system and Calm's brand system, as the supporting colour.
Real palettes that use #3f55fd
Tints & shades
Harmonies
Contrast
| #3f55fd as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.34:1 | pass | pass | fail |
|
Aaon black | 3.93:1 | fail | 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 #3f55fd as the background.
Brands using this color
Fonts for this mood
#3f55fd 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 #3f55fd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f55fd-9c9cc4-df884e-241f2d-e9eef1?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