Color
#1f1fef
#1f1fefrgb(31, 31, 239)hsl(240, 87%, 53%)oklch(0.452 0.283 267.3)Colors that go with #1f1fef
Charcoal, Crimson and Cobalt Blue 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 #1f1fef: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #1f1fef — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #1f1fef: 10 real palettes, including CVS's brand system and Procter & Gamble's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #1f1fef: 6 real palettes, including Qualcomm's brand system and Canva's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #1f1fef: 6 real palettes, including Activision's brand system and Pixar's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #1f1fef: 7 real palettes, including Cargo's brand system and Readymag's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #1f1fef: 4 real palettes, including 3M's brand system and MLB's brand system, as the supporting colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #1f1fef in 5 real palettes, including Spotify's brand system and Unity's brand system, as the lead colour.
Real palettes that use #1f1fef
Tints & shades
Harmonies
Contrast
| #1f1fef as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.4:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.5:1 | 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 #1f1fef as the background.
Brands using this color
Fonts for this mood
#1f1fef 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 #1f1fef and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/1f1fef-a19cc4-df994e-251f2d-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