#B3373B
Closest named color: Dull Red (#BB3F3F). oklch(52.1% 0.16 22.9), rgb(179, 55, 59).
Aa
White text reads best on this color (5.95:1).
About this color
#B3373B is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.160 and its hue 23°. 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 5.95:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.160) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.52:1 |
| White text | 5.95:1 |
Values
| HEX | #B3373B |
| RGB | rgb(179, 55, 59) |
| HSL | hsl(358, 53%, 46%) |
| OKLCH | oklch(52.1% 0.16 22.9) |
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 #B3373B | 5.95:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #B3373B | 3.52:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #B3373B text on white | 5.95:1 | AA | Lc 78.7 | Fine for body text |
| #B3373B text on black | 3.52:1 | 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
#F9E4E3
oklch(93.5% 0.023 20.9)
-
Step 200
200
#F5CFCC
oklch(88.6% 0.043 23.3)
-
Step 300
300
#EFADA9
oklch(80.8% 0.078 22.8)
-
Step 400
400
#E3807C
oklch(70.7% 0.123 23.1)
-
Step 500
500
#D85B5B
oklch(63% 0.158 22.7)
-
Step 600
600
#C43C41
oklch(55.6% 0.172 22.8)
-
Step 700
700 (this color)
#B3373B
oklch(52.1% 0.16 22.9)
-
Step 800
800
#89272A
oklch(42.7% 0.133 23.2)
-
Step 900
900
#6E2626
oklch(37.7% 0.103 23.4)
-
Step 950
950
#411717
oklch(27% 0.066 22.5)
#B3373B 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) | #59533A | 0.173 |
| Deuteranopia (no green cones) | #786D37 | 0.159 |
| Tritanopia (no blue cones) | #C5133A | 0.046 |
| Achromatopsia (no color) | #646464 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B3373B
#B3373B
oklch(52.1% 0.16 22.9)
- #007880
#007880
oklch(52.2% 0.089 203)
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 #B3373B, 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 0.033
- Dusty Red #B9484E ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.040
- Brown #A52A2A ΔE 0.041
- Rufous #AE2012 ΔE 0.045
- Light Burgundy #A8415B ΔE 0.046
- Lipstick Red #C0022F ΔE 0.046
Use #B3373B 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.