Color
#307cab
#307cabrgb(48, 124, 171)hsl(203, 56%, 43%)oklch(0.561 0.104 239.7)Colors that go with #307cab
Charcoal, Royal Blue and Sienna 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 #307cab: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #307cab's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #307cab on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #307cab in 9 real palettes, including Wired's brand system and Beach Hut, as the accent.
Blue #0000ff
shipped5 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #307cab, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #307cab: 8 real palettes, including Glacier and Hershey's's brand system, as the accent.
Crimson #dc143c
shippedCrimson is paired with #307cab in 16 real palettes, including Retro Pop and Wendy's's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #307cab: 5 real palettes, including Deep Water and Astro's brand system, as the lead colour.
Real palettes that use #307cab
Tints & shades
Harmonies
Contrast
| #307cab as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.57:1 | pass | pass | fail |
|
Aaon black | 4.6:1 | pass | 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 #307cab as the background.
Brands using this color
Fonts for this mood
#307cab reads as cool, modern. 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 #307cab and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/307cab-9cb0c4-df4e5d-1f222d-e9f1f0?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