Learning App
Open in tool →Green, blue and orange at full saturation: the gamified-learning look, where every color is a reward.
Color
#39b3f9
#39b3f9
hex
#39b3f9rgb
rgb(57, 179, 249)hsl
hsl(202, 94%, 60%)oklch
oklch(0.731 0.145 239.1)Closest name: Cerulean (#55aaee)Relative luminance 0.3995
Colors that go with #39b3f9
Charcoal, Dark Orange and Amber 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 #39b3f9: softer than #000 and cool enough to feel like part of the same palette.
Dark Orange #ff8c00
complementaryshippedDark Orange sits directly opposite #39b3f9 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 #39b3f9 in 5 real palettes, including Salesforce's brand system and Blueprint, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #39b3f9: 5 real palettes, including Coca-Cola's brand system and Apple's brand system, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #39b3f9 in 4 real palettes, including Terminal and Telehealth, as the lead colour.
Midnight Blue #191970
shipped7 real palettes, including Kraken's brand system and Blue Mono put Midnight Blue beside #39b3f9, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #39b3f9 in 8 real palettes, including NBA's brand system and Elastic's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #39b3f9 in 6 real palettes, including Astro's brand system and Cursor's brand system, as the text colour against it.
Real palettes that use #39b3f9
Tints & shades
Harmonies
Contrast
| #39b3f9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.34:1 | fail | fail | fail | |
Aaon black | 8.99:1 | 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 #39b3f9 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#39b3f9 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #39b3f9
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 #39b3f9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/39b3f9-9cb1c4-df4e5f-1f222d-e9f1f0?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