CSS color

rebeccapurple

#663399

hex#663399

rgbrgb(102, 51, 153)

hslhsl(270, 50%, 40%)

oklchoklch(0.44 0.16 303.4)

Relative luminance 0.0749

Cool Modern

Open in palette tool Check contrast

Rebeccapurple on this page is the real value, not a screenshot: exact hex, RGB, HSL and OKLCH, ten tints and ten shades, classic harmonies, and WCAG contrast with fixes — plus the curated palettes it appears in and any public brand that adopts it.

Tints & shades

Tints — toward white

753bb0 8547c2 915bc8 a171d0 b088d7 bf9fdf cfb6e7 dbc9ed ebe0f5 faf7fc

Shades — toward black

5c2e8a 542a7e 4a256f 422163 381c54 2e1745 261339 1c0e2a 140a1f 0a050f

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

Harmonies

Complementary

Open in tool →

663399 669933

#669933

Analogous

Open in tool →

663399 333399 993399

#333399 · #993399

Triadic

Open in tool →

663399 996633 339966

#996633 · #339966

Split-complementary

Open in tool →

663399 999933 339933

#999933 · #339933

Tetradic

Open in tool →

663399 993333 669933 339999

#993333 · #669933 · #339999

Contrast

rebeccapurple as text	Ratio	AA	AA large	AAA	Fix
Aaon white	8.41:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	2.5:1	fail	fail	fail	AA: use #915bc8 as the text (4.53:1) AAA: use #ad85d6 as the text (7.1:1) AA: or shift the background to #bfbfbf (4.57:1) AAA: or shift the background to #ebebeb (7.05:1)

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

rebeccapurple reads as cool, modern. The font library is tagged with the same vocabulary:

Modern fonts →

mcpConnect your agent — build around rebeccapurple

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 #663399 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/663399-b59cc4-c9cb62-2c1f2d-eae9f1?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