#A3303B
Closest named color: Brown (#A52A2A). oklch(48.6% 0.15 19.5), rgb(163, 48, 59).
Aa
White text reads best on this color (6.90:1).
About this color
#A3303B is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.150 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.020 away. White text reads best on it, at 6.90:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.150) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.04:1 |
| White text | 6.90:1 |
Values
| HEX | #A3303B |
| RGB | rgb(163, 48, 59) |
| HSL | hsl(354, 55%, 41%) |
| OKLCH | oklch(48.6% 0.15 19.5) |
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 #A3303B | 6.90:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #A3303B | 3.04:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #A3303B text on white | 6.90:1 | AA | Lc 82.8 | Fine for body text |
| #A3303B text on black | 3.04:1 | AA large text | Lc -19.1 | 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
#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
#ECAEAE
oklch(80.8% 0.073 18.8)
-
Step 400
400
#E08283
oklch(70.8% 0.116 19.7)
-
Step 500
500
#D45F64
oklch(63.2% 0.148 19.7)
-
Step 600
600
#BF414B
oklch(55.5% 0.161 19.6)
-
Step 700
700 (this color)
#A3303B
oklch(48.6% 0.15 19.5)
-
Step 800
800
#862B32
oklch(42.8% 0.124 19.7)
-
Step 900
900
#6C282C
oklch(37.7% 0.097 19.5)
-
Step 950
950
#3F181A
oklch(26.9% 0.061 19)
#A3303B 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) | #4F4B3B | 0.164 |
| Deuteranopia (no green cones) | #6C6338 | 0.151 |
| Tritanopia (no blue cones) | #B31035 | 0.040 |
| Achromatopsia (no color) | #5A5A5A | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A3303B
#A3303B
oklch(48.6% 0.15 19.5)
- #006D71
#006D71
oklch(48.6% 0.083 199.2)
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 #A3303B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.020
- Brick #A03623 ΔE 0.034
- Rouge #AB1239 ΔE 0.034
- Auburn #9B2226 ΔE 0.035
- Firebrick #B22222 ΔE 0.038
- Rufous #AE2012 ΔE 0.042
- Rust Red #AA2704 ΔE 0.046
- Burnt Red #9F2305 ΔE 0.048
Use #A3303B 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.