Blue Mono
Open in tool →One blue at four lightnesses — monochromatic in the colour-theory sense; the deep step is the text, the pale step the surface tint.
Color
#659ff1
#659ff1
hex
#659ff1rgb
rgb(101, 159, 241)hsl
hsl(215, 83%, 67%)oklch
oklch(0.698 0.136 257.2)Closest name: cornflowerblue (#6495ed)Relative luminance 0.3391
Colors that go with #659ff1
Charcoal, Medium Sea Green and Peru 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 #659ff1: 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 #659ff1 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Peru #cd853f
complementaryshippedPeru sits directly opposite #659ff1 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 #659ff1 in 7 real palettes, including NBA's brand system and Ahrefs's brand system, as the lead colour.
Blue #0000ff
shipped6 real palettes, including Unity's brand system and Canva's brand system put Blue beside #659ff1, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #659ff1 in 4 real palettes, including Ahrefs's brand system and Learning App, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #659ff1: 7 real palettes, including Coca-Cola's brand system and Venmo's brand system, as the accent.
Emerald Green #50c878
shippedEmerald Green is paired with #659ff1 in 4 real palettes, including Playground and Obsidian's brand system, as the accent.
Real palettes that use #659ff1
Tints & shades
Harmonies
Contrast
| #659ff1 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.7:1 | fail | fail | fail | |
Aaon black | 7.78:1 | 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 #659ff1 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#659ff1 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #659ff1
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 #659ff1 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/659ff1-9ca8c4-df5d4e-201f2d-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