Color
#306af3
#306af3rgb(48, 106, 243)hsl(222, 89%, 57%)oklch(0.569 0.215 263.6)Colors that go with #306af3
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 #306af3: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #306af3 — 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 #306af3 in 10 real palettes, including Walmart's brand system and NBA's brand system, as the accent.
Blue #0000ff
shipped14 real palettes, including MongoDB's brand system and EA's brand system put Blue beside #306af3, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #306af3: 13 real palettes, including Behance's brand system and Nokia's brand system, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #306af3: 6 real palettes, including Webflow's brand system and Roblox's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #306af3: 8 real palettes, including Elastic's brand system and Calm's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #306af3: 6 real palettes, including Bose's brand system and Nissan's brand system, as the accent.
Real palettes that use #306af3
Tints & shades
Harmonies
Contrast
| #306af3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.69:1 | pass | pass | fail |
|
Aaon black | 4.48:1 | 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 #306af3 as the background.
Brands using this color
Fonts for this mood
#306af3 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 #306af3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/306af3-9ca3c4-df6e4e-211f2d-e9eff1?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