Color
#3d57db
#3d57dbrgb(61, 87, 219)hsl(230, 69%, 55%)oklch(0.519 0.203 269.4)Colors that go with #3d57db
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 #3d57db: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3d57db — 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 #3d57db in 9 real palettes, including Walmart's brand system and Wikipedia's brand system, as the accent.
Blue #0000ff
shipped13 real palettes, including Headspace's brand system and Pixar's brand system put Blue beside #3d57db, as the accent.
Blue Violet #8a2be2
analogousshippedBlue Violet is #3d57db's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3d57db: 13 real palettes, including NHL's brand system and Warbyparker's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #3d57db: 8 real palettes, including NBA's brand system and Coca-Cola's brand system, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3d57db in 17 real palettes, including Chase's brand system and Foot Locker's brand system, as the accent.
Real palettes that use #3d57db
Tints & shades
Harmonies
Contrast
| #3d57db as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.86:1 | pass | pass | fail |
|
Aaon black | 3.58:1 | 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 #3d57db as the background.
Brands using this color
Fonts for this mood
#3d57db 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 #3d57db and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3d57db-9c9ec4-df814e-231f2d-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