#B5151F
Closest named color: Firebrick (#B22222). oklch(49.4% 0.19 25.8), rgb(181, 21, 31).
Aa
White text reads best on this color (6.79:1).
About this color
#B5151F is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.190 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.011 away. White text reads best on it, at 6.79:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.190) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.09:1 |
| White text | 6.79:1 |
Values
| HEX | #B5151F |
| RGB | rgb(181, 21, 31) |
| HSL | hsl(356, 79%, 40%) |
| OKLCH | oklch(49.4% 0.19 25.8) |
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 #B5151F | 6.79:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #B5151F | 3.09:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #B5151F text on white | 6.79:1 | AA | Lc 81.4 | Fine for body text |
| #B5151F text on black | 3.09:1 | AA large text | Lc -20.5 | 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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FBE4E1
oklch(93.7% 0.026 26.5)
-
Step 200
200
#F9CDC8
oklch(88.5% 0.05 25.7)
-
Step 300
300
#F7AAA2
oklch(81% 0.092 25.9)
-
Step 400
400
#EE786F
oklch(70.6% 0.147 25.9)
-
Step 500
500
#E54E49
oklch(63.1% 0.188 25.9)
-
Step 600
600
#D0252B
oklch(55.5% 0.205 25.8)
-
Step 700
700 (this color)
#B5151F
oklch(49.4% 0.19 25.8)
-
Step 800
800
#92171B
oklch(42.7% 0.157 25.8)
-
Step 900
900
#751D1C
oklch(37.7% 0.122 25.8)
-
Step 950
950
#451311
oklch(27% 0.077 26)
#B5151F 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) | #4E451D | 0.208 |
| Deuteranopia (no green cones) | #746716 | 0.189 |
| Tritanopia (no blue cones) | #C8001C | 0.038 |
| Achromatopsia (no color) | #5B5B5B | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B5151F
#B5151F
oklch(49.4% 0.19 25.8)
- #006F79
#006F79
oklch(49.5% 0.085 205.7)
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 #B5151F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.011
- Scarlet #BE0119 ΔE 0.018
- Rufous #AE2012 ΔE 0.020
- Lipstick Red #C0022F ΔE 0.029
- Rust Red #AA2704 ΔE 0.033
- Brown #A52A2A ΔE 0.033
- Rusty Red #AF2F0D ΔE 0.035
- Rouge #AB1239 ΔE 0.038
Use #B5151F 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.