Color

#397dea

#397dea
hex#397dea
rgbrgb(57, 125, 234)
hslhsl(217, 81%, 57%)
oklchoklch(0.604 0.179 259.5)
Closest name: Blue Öyster Cult (#5577ee)Relative luminance 0.2148

Tints & shades

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

Harmonies

Complementary

Open in tool →

#eaa639

#39d5ea · #4d39ea

#ea397d · #7dea39

Split-complementary

Open in tool →

#ea4d39 · #d5ea39

#ea39d5 · #eaa639 · #39ea4d

Contrast

#397dea as textRatioAAAA largeAAAFix
Aaon white
3.97:1failpassfail
  • AA: use #2670e8 as the text (4.6:1)
  • AAA: use #1353b9 as the text (7.08:1)
  • AA: or shift the background to #171717 (4.52:1)
Aaon black
5.3:1passpassfail
  • AAA: use #6298ef as the text (7.26:1)

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

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

mcpConnect your agent — build around #397dea
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

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

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

tool url/palettes/new/397dea-9ca7c4-df624e-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