Heatwave
Open in tool →Blaze orange and hot yellow with one cold blue — the high-noon palette; use the blue where the eye needs to rest.
Color
#fb5523
#fb5523
hex
#fb5523rgb
rgb(251, 85, 35)hsl
hsl(14, 96%, 56%)oklch
oklch(0.671 0.21 36.2)Closest name: orangered (#ff4500)Relative luminance 0.2713
Colors that go with #fb5523
Cadet Blue, Charcoal 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.
Cadet Blue #5f9ea0
complementaryshippedCadet Blue sits directly opposite #fb5523 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #fb5523: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Amber #ffbf00
shippedAmber is paired with #fb5523 in 8 real palettes, including Heatwave and Ember, as the supporting colour.
Blue #0000ff
shipped7 real palettes, including Readymag's brand system and Monzo's brand system put Blue beside #fb5523, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #fb5523: 4 real palettes, including Tide's brand system and NASA's brand system, as the lead colour.
Cornflower Blue #6495ed
split-complementshippedCornflower Blue is a split-complement of #fb5523: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Crimson #dc143c
shippedCrimson is paired with #fb5523 in 9 real palettes, including Pizza Hut's brand system and Wise's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #fb5523: 15 real palettes, including Strava's brand system and Soundcloud's brand system, as the accent.
Real palettes that use #fb5523
Tints & shades
Harmonies
Contrast
| #fb5523 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.27:1 | fail | pass | fail | |
Aaon black | 6.43:1 | 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 #fb5523 as the background.
Brands using this color
- Prepare your taste buds...primary · #fc5404 · Δ1.028
- Stravaprimary · #fc5404 · Δ1.028
- Substackprimary · #fc5404 · Δ1.028
- Readymagaccent · #ff5000 · Δ1.224
- Soundcloudsecondary · #ff5500 · Δ1.322
- Intercomsecondary · #ff5600 · Δ1.398
- Together AIprimary · #fc4c02 · Δ1.441
- Tideaccent · #fb4c06 · Δ1.453
- PlanetScaleprimary · #f35815 · Δ1.736
- PlanetScalesecondary · #f35815 · Δ1.736
- HubSpotsecondary · #ff4800 · Δ1.854
- Cloudflaresecondary · #ff5e1f · Δ1.914
- Cursorprimary · #f54e00 · Δ1.99
- Cursorsecondary · #f54e00 · Δ1.99
Palettes built around it
Fonts for this mood
#fb5523 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #fb5523
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 #fb5523 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/fb5523-c4aa9c-62cbb1-2d291f-f1e9eb?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