Color

#ff3a33

#ff3a33
hex#ff3a33
rgbrgb(255, 58, 51)
hslhsl(2, 100%, 60%)
oklchoklch(0.654 0.232 27.9)
Closest name: Blood Burst (#ff474c)Relative luminance 0.2453

Tints & shades

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

Harmonies

Complementary

Open in tool →

#33f8ff

#ff3392 · #ffa033

#33ff3a · #3a33ff

Split-complementary

Open in tool →

#33ffa0 · #3392ff

#92ff33 · #33f8ff · #a033ff

Contrast

#ff3a33 as textRatioAAAA largeAAAFix
Aaon white
3.56:1failpassfail
  • AA: use #eb0800 as the text (4.6:1)
  • AAA: use #b30600 as the text (7.14:1)
  • AA: or shift the background to #212121 (4.53:1)
Aaon black
5.91:1passpassfail
  • AAA: use #ff615c as the text (7.12:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #ff3a33 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#ff3a33 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #ff3a33
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 #ff3a33 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/ff3a33-c4a29c-62cb9c-2d261f-f1e9ed?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