Crayon Box
Open in tool →Red, teal and yellow at crayon saturation — joyful, but on white with black type so it stays readable for grown-ups.
Color
#ff5757
#ff5757
hex
#ff5757rgb
rgb(255, 87, 87)hsl
hsl(0, 100%, 67%)oklch
oklch(0.685 0.204 24.3)Closest name: Blood Burst (#ff474c)Relative luminance 0.2876
Colors that go with #ff5757
Charcoal, Light Sea Green 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 body-text near-black for #ff5757: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Light Sea Green #20b2aa
complementaryshippedLight Sea Green sits directly opposite #ff5757 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 #ff5757 in 7 real palettes, including Heatwave and Ember, as the supporting colour.
Blue #0000ff
shipped7 real palettes, including Monzo's brand system and Readymag's brand system put Blue beside #ff5757, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #ff5757: 5 real palettes, including NASA's brand system and Tide's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #ff5757 in 9 real palettes, including Snyk's brand system and Wise's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #ff5757: 13 real palettes, including Strava's brand system and Soundcloud's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #ff5757: 7 real palettes, including Heatwave and Readymag's brand system, as the accent.
Real palettes that use #ff5757
Tints & shades
Harmonies
Contrast
| #ff5757 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.11:1 | fail | pass | fail | |
Aaon black | 6.75:1 | 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 #ff5757 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#ff5757 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #ff5757
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 #ff5757 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/ff5757-c4a19c-62cb98-2d251f-f1e9ed?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