Color
#3f37cd
#3f37cdrgb(63, 55, 205)hsl(243, 60%, 51%)oklch(0.456 0.22 275.5)Colors that go with #3f37cd
Charcoal, Sea Green 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 #3f37cd: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3f37cd — 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 #3f37cd in 4 real palettes, including Warner Bros.'s brand system and Binance's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Cornflower Blue #6495ed
shippedCornflower Blue is paired with #3f37cd in 5 real palettes, including Qualcomm's brand system and Blue Mono, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Crimson #dc143c
shippedCrimson is paired with #3f37cd in 9 real palettes, including Behance's brand system and Chase's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Dodger Blue #1e90ff
shippedDodger Blue is paired with #3f37cd in 5 real palettes, including Cargo's brand system and Readymag's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Firebrick #b22222
shippedFirebrick is paired with #3f37cd in 4 real palettes, including Nissan's brand system and Datadog's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Light Sky Blue #87cefa
shippedLight Sky Blue is paired with #3f37cd in 4 real palettes, including Telehealth and Calm's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #3f37cd
Tints & shades
Harmonies
Contrast
| #3f37cd as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.96:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.64:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3f37cd 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
#3f37cd 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 #3f37cd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f37cd-a39cc4-dfa04e-261f2d-e9edf1?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