#B23939
Closest named color: Dull Red (#BB3F3F). oklch(52.1% 0.157 24.4), rgb(178, 57, 57).
Aa
White text reads best on this color (5.93:1).
About this color
#B23939 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.157 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.023 away. White text reads best on it, at 5.93:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.157) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.53:1 |
| White text | 5.93:1 |
Values
| HEX | #B23939 |
| RGB | rgb(178, 57, 57) |
| HSL | hsl(0, 51%, 46%) |
| OKLCH | oklch(52.1% 0.157 24.4) |
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 #B23939 | 5.93:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #B23939 | 3.53:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #B23939 text on white | 5.93:1 | AA | Lc 78.7 | Fine for body text |
| #B23939 text on black | 3.53:1 | AA large text | Lc -23.1 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F8E5E3
oklch(93.7% 0.021 24.8)
-
Step 200
200
#F4CFCB
oklch(88.5% 0.042 25.3)
-
Step 300
300
#EEAEA8
oklch(80.9% 0.076 24.9)
-
Step 400
400
#E2817B
oklch(70.7% 0.121 24.3)
-
Step 500
500
#D75D59
oklch(63.1% 0.155 24.4)
-
Step 600
600
#C33E3E
oklch(55.6% 0.17 24.5)
-
Step 700
700 (this color)
#B23939
oklch(52.1% 0.157 24.4)
-
Step 800
800
#882929
oklch(42.7% 0.13 24.5)
-
Step 900
900
#6E2725
oklch(37.8% 0.102 24.8)
-
Step 950
950
#411816
oklch(27.1% 0.064 25.1)
#B23939 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) | #5A5338 | 0.169 |
| Deuteranopia (no green cones) | #786D35 | 0.155 |
| Tritanopia (no blue cones) | #C3183A | 0.046 |
| Achromatopsia (no color) | #646464 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B23939
#B23939
oklch(52.1% 0.157 24.4)
- #007881
#007881
oklch(52.2% 0.089 204)
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 #B23939, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.023
- Firebrick #B22222 ΔE 0.034
- Dusty Red #B9484E ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.037
- Brown #A52A2A ΔE 0.041
- Rufous #AE2012 ΔE 0.045
- Brick #A03623 ΔE 0.045
- Sinopia #BB3E03 ΔE 0.047
Use #B23939 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.