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
#39b1d5
#39b1d5
hex
#39b1d5rgb
rgb(57, 177, 213)hsl
hsl(194, 65%, 53%)oklch
oklch(0.71 0.115 222.3)Closest name: Aquarius (#2db0ce)Relative luminance 0.3712
Colors that go with #39b1d5
Charcoal, Amber 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 #39b1d5: softer than #000 and cool enough to feel like part of the same palette.
Amber #ffbf00
shippedAmber is paired with #39b1d5 in 4 real palettes, including Blueprint and Salesforce's brand system, as the accent.
Dark Orange #ff8c00
shippedDark Orange shows up next to #39b1d5 in 4 real palettes, including Elastic's brand system and Learning App, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #39b1d5: 7 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 #39b1d5: 4 real palettes, including Figma's brand system and Patreon's brand system, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #39b1d5 in 4 real palettes, including Terminal and Khan Academy's brand system, as the lead colour.
Midnight Blue #191970
shipped9 real palettes, including Confluent's brand system and SoFi's brand system put Midnight Blue beside #39b1d5, as the lead colour.
Coral #ff7f50
complementaryCoral sits directly opposite #39b1d5 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #39b1d5
Tints & shades
Harmonies
Contrast
| #39b1d5 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.49:1 | fail | fail | fail | |
Aaon black | 8.42:1 | 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 #39b1d5 as the background.
Brands using this color
Palettes built around it
Deep Water
Open in tool →Cyan and mid-blue on abyss navy with a foam highlight — the ocean at depth; the darker the surface, the brighter the water.
Lagoon
Open in tool →Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef.
Fonts for this mood
#39b1d5 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #39b1d5
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 #39b1d5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/39b1d5-9cb6c4-df4e72-1f242d-e9f1ef?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