Terminal
Open in tool →Green for success, blue for links, pink for emphasis — the dark-mode developer family, tuned to sit on near-black without glare.
Color
#42a4ff
#42a4ff
hex
#42a4ffrgb
rgb(66, 164, 255)hsl
hsl(209, 100%, 63%)oklch
oklch(0.703 0.161 249.9)Closest name: Cerulean (#55aaee)Relative luminance 0.3493
Colors that go with #42a4ff
Charcoal, Tomato 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 #42a4ff: softer than #000 and cool enough to feel like part of the same palette.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #42a4ff: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #42a4ff in 7 real palettes, including NBA's brand system and Salesforce's brand system, as the lead colour.
Blue #0000ff
shipped8 real palettes, including Unity's brand system and Warp's brand system put Blue beside #42a4ff, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #42a4ff in 5 real palettes, including Learning App and Elastic's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #42a4ff: 5 real palettes, including Apple's brand system and Venmo's brand system, as the accent.
Gold #ffd700
shippedGold shows up next to #42a4ff in 4 real palettes, including Miro's brand system and Prime Video's brand system, as the lead colour.
Medium Sea Green #3cb371
triadicshippedMedium Sea Green completes a triad with #42a4ff — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #42a4ff
Tints & shades
Harmonies
Contrast
| #42a4ff as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.63:1 | fail | fail | fail | |
Aaon black | 7.99:1 | 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 #42a4ff as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#42a4ff reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #42a4ff
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 #42a4ff and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/42a4ff-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