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
#4fa3f3
#4fa3f3
hex
#4fa3f3rgb
rgb(79, 163, 243)hsl
hsl(209, 87%, 63%)oklch
oklch(0.699 0.143 249.6)Closest name: Cerulean (#55aaee)Relative luminance 0.3433
Colors that go with #4fa3f3
Charcoal, Amber and 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 #4fa3f3: softer than #000 and cool enough to feel like part of the same palette.
Amber #ffbf00
shippedAmber is paired with #4fa3f3 in 6 real palettes, including NBA's brand system and Salesforce's brand system, as the lead colour.
Blue #0000ff
shipped5 real palettes, including Unity's brand system and Warp's brand system put Blue beside #4fa3f3, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #4fa3f3 in 5 real palettes, including Learning App and Elastic's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #4fa3f3: 6 real palettes, including Coca-Cola's brand system and Apple's brand system, as the accent.
Medium Sea Green #3cb371
triadicshippedMedium Sea Green completes a triad with #4fa3f3 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Midnight Blue #191970
shipped7 real palettes, including Blue Mono and Kraken's brand system put Midnight Blue beside #4fa3f3, as the text colour against it.
Orange Red #ff4500
shippedOrange Red is paired with #4fa3f3 in 7 real palettes, including Figma's brand system and Cursor's brand system, as the lead colour.
Real palettes that use #4fa3f3
Tints & shades
Harmonies
Contrast
| #4fa3f3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.67:1 | fail | fail | fail | |
Aaon black | 7.87:1 | 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 #4fa3f3 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
#4fa3f3 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #4fa3f3
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 #4fa3f3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/4fa3f3-9cacc4-df4e4e-1f212d-e9f1f1?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