Color
#3151e3
#3151e3rgb(49, 81, 227)hsl(229, 76%, 54%)oklch(0.51 0.223 267.6)Colors that go with #3151e3
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 #3151e3: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3151e3 — 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 #3151e3 in 7 real palettes, including Walmart's brand system and NBA's brand system, as the accent.
Blue #0000ff
shipped8 real palettes, including Headspace's brand system and Dropbox's brand system put Blue beside #3151e3, as the accent.
Blue Violet #8a2be2
analogousshippedBlue Violet is #3151e3'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 #3151e3: 12 real palettes, including NHL's brand system and Warbyparker's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #3151e3: 10 real palettes, including Roblox's brand system and NBA's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #3151e3 in 18 real palettes, including Chase's brand system and Coinbase's brand system, as the accent.
Real palettes that use #3151e3
Tints & shades
Harmonies
Contrast
| #3151e3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.15:1 | pass | pass | fail |
|
Aaon black | 3.42:1 | 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 #3151e3 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
#3151e3 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 #3151e3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3151e3-9c9fc4-df7e4e-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