brandsweets

Brand color

Slack Primary

#1264a3
hex#1264a3
rgbrgb(18, 100, 163)
hslhsl(206, 80%, 35%)
oklchoklch(0.491 0.124 248.1)
From Slack brand colorsRelative luminance 0.1189
CoolVividTechnicalModern
Open in palette toolCheck contrast

Slack Primary 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 2 public brands that use it and the palettes it appears in.

Tints & shades

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

Harmonies

Complementary

Open in tool →
1264a3a15012

#a15012

Analogous

Open in tool →
1264a312a197121ba1

#12a197 · #121ba1

Triadic

Open in tool →
1264a3a1126363a112

#a11263 · #63a112

Split-complementary

Open in tool →
1264a3a1121ba19712

#a1121b · #a19712

Tetradic

Open in tool →
1264a39712a1a150121ba112

#9712a1 · #a15012 · #1ba112

Contrast

Slack Primary as textRatioAAAA largeAAAFix
Aaon white
6.22:1passpassfail
  • AAA: use #105a93 as the text (7.23:1)
Aaon black
3.38:1failpassfail
  • AA: use #1679c5 as the text (4.58:1)
  • AAA: use #359be9 as the text (7.02:1)
  • AA: or shift the background to #dedede (4.62:1)

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

Brands using this color

Fonts for this mood

Slack Primary reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

Technical fonts →Modern fonts →
mcpConnect your agent — build around Slack Primary
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 #1264a3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1264a3-9caec4-df4e56-1f212d-e9f1f1?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