Color
#306ec5
#306ec5rgb(48, 110, 197)hsl(215, 61%, 48%)oklch(0.544 0.15 257.6)Colors that go with #306ec5
Charcoal, Crimson and Sea Green 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 #306ec5: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #306ec5 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #306ec5 — 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 #306ec5 in 9 real palettes, including Wikipedia's brand system and Warner Bros.'s brand system, as the accent.
Blue #0000ff
shipped15 real palettes, including Pixar's brand system and BBC's brand system put Blue beside #306ec5, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #306ec5: 10 real palettes, including Intel's brand system and General Mills's brand system, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #306ec5: 6 real palettes, including Coca-Cola's brand system and NBA's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #306ec5: 5 real palettes, including Astro's brand system and Deep Water, as the supporting colour.
Real palettes that use #306ec5
Tints & shades
Harmonies
Contrast
| #306ec5 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.05:1 | pass | pass | fail |
|
Aaon black | 4.16:1 | 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 #306ec5 as the background.
Brands using this color
Fonts for this mood
#306ec5 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 #306ec5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/306ec5-9ca8c4-df5d4e-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