#B7231A
Closest named color: Firebrick (#B22222). oklch(50.6% 0.185 29.1), rgb(183, 35, 26).
Aa
White text reads best on this color (6.42:1).
About this color
#B7231A is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.185 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.013 away. White text reads best on it, at 6.42:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.185) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.26:1 |
| White text | 6.42:1 |
Values
| HEX | #B7231A |
| RGB | rgb(183, 35, 26) |
| HSL | hsl(3, 75%, 41%) |
| OKLCH | oklch(50.6% 0.185 29.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #B7231A | 6.42:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #B7231A | 3.26:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #B7231A text on white | 6.42:1 | AA | Lc 80.2 | Fine for body text |
| #B7231A text on black | 3.26:1 | AA large text | Lc -21.6 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FBE4E0
oklch(93.6% 0.026 29.4)
-
Step 200
200
#F8CEC6
oklch(88.5% 0.049 30.7)
-
Step 300
300
#F5AB9F
oklch(80.9% 0.09 29.4)
-
Step 400
400
#EC7B6B
oklch(70.7% 0.142 29.4)
-
Step 500
500
#E35243
oklch(63.2% 0.183 29.1)
-
Step 600
600
#CE2D22
oklch(55.6% 0.198 29.1)
-
Step 700
700 (this color)
#B7231A
oklch(50.6% 0.185 29.1)
-
Step 800
800
#901C14
oklch(42.6% 0.153 29.2)
-
Step 900
900
#742018
oklch(37.8% 0.119 29.2)
-
Step 950
950
#44140F
oklch(26.9% 0.075 28.9)
#B7231A with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #544A16 | 0.199 |
| Deuteranopia (no green cones) | #776A10 | 0.181 |
| Tritanopia (no blue cones) | #CA0023 | 0.041 |
| Achromatopsia (no color) | #5F5F5F | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B7231A
#B7231A
oklch(50.6% 0.185 29.1)
- #007280
#007280
oklch(50.6% 0.087 209.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #B7231A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.013
- Rufous #AE2012 ΔE 0.021
- Scarlet #BE0119 ΔE 0.023
- Rusty Red #AF2F0D ΔE 0.023
- Rust Red #AA2704 ΔE 0.030
- Lipstick Red #C0022F ΔE 0.036
- Brown #A52A2A ΔE 0.037
- Sinopia #BB3E03 ΔE 0.047
Use #B7231A in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.