Color
#213fd4
#213fd4rgb(33, 63, 212)hsl(230, 73%, 48%)oklch(0.46 0.228 266.7)Colors that go with #213fd4
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 #213fd4: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #213fd4 — 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 #213fd4 in 5 real palettes, including Walmart's brand system and Binance's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #213fd4: 9 real palettes, including Qualcomm's brand system and Blue Mono, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #213fd4 in 15 real palettes, including Behance's brand system and Chase's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #213fd4: 10 real palettes, including Coursera's brand system and Cargo's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #213fd4: 5 real palettes, including MLB's brand system and 3M's brand system, as the supporting colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #213fd4 in 7 real palettes, including Indigo SaaS and Spotify's brand system, as the accent.
Real palettes that use #213fd4
Tints & shades
Harmonies
Contrast
| #213fd4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.7:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.73:1 | 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 #213fd4 as the background.
Brands using this color
Fonts for this mood
#213fd4 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 #213fd4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/213fd4-9c9ec4-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