#B43740
Closest named color: Dull Red (#BB3F3F). oklch(52.4% 0.161 20.7), rgb(180, 55, 64).
Aa
White text reads best on this color (5.89:1).
About this color
#B43740 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.161 and its hue 21°. 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 5.89:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.161) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.56:1 |
| White text | 5.89:1 |
Values
| HEX | #B43740 |
| RGB | rgb(180, 55, 64) |
| HSL | hsl(356, 53%, 46%) |
| OKLCH | oklch(52.4% 0.161 20.7) |
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 #B43740 | 5.89:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #B43740 | 3.56:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #B43740 text on white | 5.89:1 | AA | Lc 78.4 | Fine for body text |
| #B43740 text on black | 3.56:1 | AA large text | Lc -23.4 | 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 600.
-
Step 50
50
#FCF3F3
oklch(97.1% 0.01 17.3)
-
Step 100
100
#F8E5E4
oklch(93.7% 0.021 21.2)
-
Step 200
200
#F3CFCE
oklch(88.5% 0.041 19.8)
-
Step 300
300
#ECAFAD
oklch(81% 0.072 20.9)
-
Step 400
400
#E08281
oklch(70.8% 0.116 21.1)
-
Step 500
500
#D45F62
oklch(63.1% 0.148 20.7)
-
Step 600
600 (this color)
#B43740
oklch(52.4% 0.161 20.7)
-
Step 700
700
#A4323A
oklch(49% 0.149 20.7)
-
Step 800
800
#862B30
oklch(42.7% 0.124 21)
-
Step 900
900
#6C282B
oklch(37.7% 0.097 20.4)
-
Step 950
950
#3F1819
oklch(26.8% 0.061 20.5)
#B43740 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) | #59533F | 0.174 |
| Deuteranopia (no green cones) | #786E3C | 0.161 |
| Tritanopia (no blue cones) | #C5153B | 0.043 |
| Achromatopsia (no color) | #646464 | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B43740
#B43740
oklch(52.4% 0.161 20.7)
- #00797F
#00797F
oklch(52.4% 0.089 200.9)
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 #B43740, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.023
- Dusty Red #B9484E ΔE 0.034
- Firebrick #B22222 ΔE 0.038
- Light Burgundy #A8415B ΔE 0.041
- Dark Rose #B5485D ΔE 0.042
- Brown #A52A2A ΔE 0.045
- Lipstick Red #C0022F ΔE 0.046
- Light Maroon #A24857 ΔE 0.046
Use #B43740 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.