Color
#0306ba
#0306bargb(3, 6, 186)hsl(239, 97%, 37%)oklch(0.36 0.244 264.5)Colors that go with #0306ba
Charcoal, Crimson and Cobalt Blue 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 #0306ba: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #0306ba — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #0306ba: 6 real palettes, including Tide's brand system and Unilever's brand system, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #0306ba: 5 real palettes, including Canva's brand system and Spotify's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #0306ba: 5 real palettes, including Unilever's brand system and Activision's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #0306ba: 5 real palettes, including Absolut's brand system and Cargo's brand system, as the supporting colour.
Midnight Blue #191970
shipped6 real palettes, including Monzo's brand system and Sketch's brand system put Midnight Blue beside #0306ba, as the lead colour.
Orange Red #ff4500
shippedOrange Red is paired with #0306ba in 7 real palettes, including Intercom's brand system and Tide's brand system, as the supporting colour.
Real palettes that use #0306ba
Tints & shades
Harmonies
Contrast
| #0306ba as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 12.08:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.74:1 | 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 #0306ba as the background.
Brands using this color
Fonts for this mood
#0306ba 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 #0306ba and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0306ba-a09cc4-df964e-251f2d-e9edf1?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