Color
#306ed9
#306ed9rgb(48, 110, 217)hsl(218, 69%, 52%)oklch(0.558 0.176 260.5)Colors that go with #306ed9
Charcoal, Crimson 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 #306ed9: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #306ed9 — 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 #306ed9 in 11 real palettes, including Walmart's brand system and Wikipedia's brand system, as the accent.
Blue #0000ff
shipped16 real palettes, including BBC's brand system and EA's brand system put Blue beside #306ed9, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #306ed9: 13 real palettes, including Carrefour's brand system and Unilever's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #306ed9: 6 real palettes, including NBA's brand system and Webflow's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #306ed9: 8 real palettes, including Astro's brand system and Venmo's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #306ed9: 7 real palettes, including Campbell's's brand system and Nissan's brand system, as the supporting colour.
Real palettes that use #306ed9
Tints & shades
Harmonies
Contrast
| #306ed9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.82:1 | pass | pass | fail |
|
Aaon black | 4.36:1 | 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 #306ed9 as the background.
Brands using this color
Fonts for this mood
#306ed9 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 #306ed9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/306ed9-9ca6c4-df644e-201f2d-e9f0f1?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