Color
#313f77
#313f77rgb(49, 63, 119)hsl(228, 42%, 33%)oklch(0.386 0.097 270.7)Colors that go with #313f77
Steel Blue, Crimson and Denim 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #313f77's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Crimson #dc143c
shippedCrimson is paired with #313f77 in 6 real palettes, including Marvel's brand system and Casper Sleep's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #313f77: 11 real palettes, including Hasbro's brand system and Hinge's brand system, as the supporting colour.
Midnight Blue #191970
shipped12 real palettes, including Microsoft's brand system and First Snow put Midnight Blue beside #313f77, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #313f77 in 4 real palettes, including Tumblr's brand system and Tide's brand system, as the accent.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #313f77: 6 real palettes, including First Snow and Glacier, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #313f77 in 11 real palettes, including Zoom's brand system and Confluent's brand system, as the lead colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #313f77: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #313f77
Tints & shades
Harmonies
Contrast
| #313f77 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.96:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.11:1 | 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 #313f77 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#313f77 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 #313f77 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/313f77-9c9fc4-df7c4e-231f2d-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