Color

#397ad5

#397ad5
hex#397ad5
rgbrgb(57, 122, 213)
hslhsl(215, 65%, 53%)
oklchoklch(0.584 0.155 257.4)
Closest name: Haddock’s Sweater (#277aba)Relative luminance 0.1959

Colors that go with #397ad5

Charcoal, Copper and Amber 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.

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#d59439

#39c8d5 · #4639d5

#d5397a · #7ad539

Split-complementary

Open in tool →

#d54639 · #c8d539

#d539c8 · #d59439 · #39d546

Contrast

#397ad5 as textRatioAAAA largeAAAFix
Aaon white
4.27:1failpassfail
  • AA: use #3175d3 as the text (4.55:1)
  • AAA: use #2256a0 as the text (7.22:1)
  • AA: or shift the background to #0d0d0d (4.55:1)
Aaon black
4.92:1passpassfail
  • AAA: use #6899df as the text (7.21:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #397ad5 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

#397ad5 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #397ad5
live endpoint

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.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #397ad5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/397ad5-9ca8c4-df5d4e-201f2d-e9f0f1?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md