Color
#3b8591
#3b8591rgb(59, 133, 145)hsl(188, 42%, 40%)oklch(0.575 0.075 209.6)Colors that go with #3b8591
Charcoal, Copper and Rust 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #3b8591: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
split-complementshippedCopper is a split-complement of #3b8591: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Rust #b7410e
complementaryshippedRust sits directly opposite #3b8591 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #3b8591 in 4 real palettes, including Beach Hut and Lemon Squeezy's brand system, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3b8591: 6 real palettes, including Ink & Paper and Glacier, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3b8591 in 11 real palettes, including Redfin's brand system and Retro Pop, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #3b8591: 4 real palettes, including Deep Water and Telegram's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #3b8591: 13 real palettes, including Peacock and Campus, as the supporting colour.
Real palettes that use #3b8591
Tints & shades
Harmonies
Contrast
| #3b8591 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.24:1 | fail | pass | fail | |
Aaon black | 4.95:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3b8591 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
#3b8591 reads as cool, modern. The font library is tagged with the same vocabulary:
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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #3b8591 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3b8591-a2b7be-df4e81-1f252d-e9f1ee?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md