Color
#397fb1
#397fb1rgb(57, 127, 177)hsl(205, 51%, 46%)oklch(0.574 0.104 242.7)Colors that go with #397fb1
Charcoal, Royal Blue and Rust 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 #397fb1: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #397fb1's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Rust #b7410e
split-complementshippedRust is a split-complement of #397fb1: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Copper #b87333
complementaryshippedCopper sits directly opposite #397fb1 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 #397fb1 in 10 real palettes, including Beach Hut and Wired's brand system, as the supporting colour.
Blue #0000ff
shipped7 real palettes, including Activision's brand system and Qualcomm's brand system put Blue beside #397fb1, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #397fb1: 8 real palettes, including Hershey's's brand system and Glacier, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #397fb1 in 16 real palettes, including Retro Pop and NASCAR's brand system, as the lead colour.
Real palettes that use #397fb1
Tints & shades
Harmonies
Contrast
| #397fb1 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.33:1 | fail | pass | fail | |
Aaon black | 4.84:1 | 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 #397fb1 as the background.
Brands using this color
Fonts for this mood
#397fb1 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 #397fb1 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/397fb1-9cafc4-df4e58-1f212d-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