Circuit
Open in tool →Violet plus cyan is the current AI-product signal — pair it with pure black type to keep it from going candy.
Color
#15bcd5
#15bcd5
hex
#15bcd5rgb
rgb(21, 188, 213)hsl
hsl(188, 82%, 46%)oklch
oklch(0.731 0.125 211.8)Closest name: Blue Bobbin (#52b4ca)Relative luminance 0.4093
Colors that go with #15bcd5
Charcoal, Blue and Dark Orange 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 #15bcd5: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped4 real palettes, including Canva's brand system and Warp's brand system put Blue beside #15bcd5, as the accent.
Dark Orange #ff8c00
split-complementshippedDark Orange is a split-complement of #15bcd5: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Denim #1560bd
shippedDesigners have shipped Denim with #15bcd5: 6 real palettes, including Coca-Cola's brand system and Venmo's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #15bcd5: 5 real palettes, including Patreon's brand system and Figma's brand system, as the accent.
Midnight Blue #191970
shipped8 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #15bcd5, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #15bcd5 in 8 real palettes, including Confluent's brand system and Elastic's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #15bcd5 in 9 real palettes, including Crayon Box and Cursor's brand system, as the text colour against it.
Real palettes that use #15bcd5
Tints & shades
Harmonies
Contrast
| #15bcd5 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.29:1 | fail | fail | fail | |
Aaon black | 9.19:1 | pass | pass | pass | Passes AAA — no fix needed. |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #15bcd5 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#15bcd5 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #15bcd5
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #15bcd5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/15bcd5-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