Color
#538df9
#538df9rgb(83, 141, 249)hsl(219, 93%, 65%)oklch(0.657 0.172 261.6)Colors that go with #538df9
Charcoal, Medium Sea Green and Tomato 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 #538df9: softer than #000 and cool enough to feel like part of the same palette.
Medium Sea Green #3cb371
triadicshippedMedium Sea Green completes a triad with #538df9 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Tomato #ff6347
triadicshippedTomato completes a triad with #538df9 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #538df9 in 9 real palettes, including Google's brand system and Heatwave, as the accent.
Blue #0000ff
shipped11 real palettes, including Unity's brand system and Qualcomm's brand system put Blue beside #538df9, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #538df9: 5 real palettes, including Blue Mono and Carrefour's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #538df9 in 7 real palettes, including Behance's brand system and NASCAR's brand system, as the accent.
Dark Orange #ff8c00
shippedDark Orange shows up next to #538df9 in 4 real palettes, including Playground and Ahrefs's brand system, as the lead colour.
Real palettes that use #538df9
Tints & shades
Harmonies
Contrast
| #538df9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.21:1 | fail | pass | fail | |
Aaon black | 6.55:1 | 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 #538df9 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
#538df9 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 #538df9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/538df9-9ca5c4-df664e-211f2d-e9f0f1?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