Color
#343d79
#343d79rgb(52, 61, 121)hsl(232, 40%, 34%)oklch(0.385 0.102 274.2)Colors that go with #343d79
Steel Blue, Blue and Crimson 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 #343d79's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped5 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #343d79, as the accent.
Crimson #dc143c
shippedCrimson is paired with #343d79 in 8 real palettes, including Marvel's brand system and Casper Sleep's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #343d79: 17 real palettes, including Hasbro's brand system and Hinge's brand system, as the supporting colour.
Midnight Blue #191970
shipped14 real palettes, including Microsoft's brand system and First Snow put Midnight Blue beside #343d79, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #343d79 in 5 real palettes, including NASA's brand system and Tumblr's brand system, as the supporting colour.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #343d79: 6 real palettes, including First Snow and Glacier, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #343d79: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #343d79
Tints & shades
Harmonies
Contrast
| #343d79 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.05:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.09:1 | 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 #343d79 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
#343d79 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 #343d79 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/343d79-9c9dc4-df864e-231f2d-e9eef1?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