Color
#1d37fc
#1d37fcrgb(29, 55, 252)hsl(233, 97%, 55%)oklch(0.491 0.281 266.3)Colors that go with #1d37fc
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 #1d37fc: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #1d37fc — 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 #1d37fc: 11 real palettes, including Zillow's brand system and NHL's brand system, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #1d37fc: 7 real palettes, including Qualcomm's brand system and Canva's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #1d37fc: 7 real palettes, including Pixar's brand system and Dairy Queen's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #1d37fc: 9 real palettes, including Unity's brand system and Cargo's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #1d37fc: 4 real palettes, including Bose's brand system and 3M's brand system, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #1d37fc in 6 real palettes, including Unity's brand system and Spotify's brand system, as the accent.
Real palettes that use #1d37fc
Tints & shades
Harmonies
Contrast
| #1d37fc as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.99:1 | pass | pass | fail |
|
Aaon black | 3:1 | 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 #1d37fc as the background.
Brands using this color
Fonts for this mood
#1d37fc 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 #1d37fc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/1d37fc-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