Color
#138fc9
#138fc9rgb(19, 143, 201)hsl(199, 83%, 43%)oklch(0.616 0.13 237)Colors that go with #138fc9
Charcoal, Red and Royal Blue 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 #138fc9: softer than #000 and cool enough to feel like part of the same palette.
Red #ff0000
split-complementshippedRed is a split-complement of #138fc9: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
analogousshippedRoyal Blue is #138fc9's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Copper #b87333
complementaryshippedCopper sits directly opposite #138fc9 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 #138fc9 in 8 real palettes, including Beach Hut and Wired's brand system, as the supporting colour.
Blue #0000ff
shipped8 real palettes, including Readymag's brand system and Qualcomm's brand system put Blue beside #138fc9, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #138fc9: 7 real palettes, including Hershey's's brand system and Glacier, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #138fc9 in 6 real palettes, including Retro Pop and State Farm's brand system, as the lead colour.
Real palettes that use #138fc9
Tints & shades
Harmonies
Contrast
| #138fc9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.62:1 | fail | pass | fail | |
Aaon black | 5.8:1 | 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 #138fc9 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
#138fc9 reads as cool, vivid, technical. 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 #138fc9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/138fc9-9cb3c4-df4e66-1f232d-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