#E03403
Closest named color: Tomato Red (#EC2D01). oklch(59.2% 0.213 33.8), rgb(224, 52, 3).
Aa
Black text reads best on this color (4.66:1).
About this color
#E03403 is a medium-dark, vivid red. In OKLCH its lightness is 59%, its chroma 0.213 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Tomato Red (#EC2D01), ΔE 0.023 away. Black text reads best on it, at 4.66:1.
| Hue family | Reds |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.213) |
| Temperature | warm |
| Nearest name | Tomato Red (#EC2D01) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #E03403 |
| RGB | rgb(224, 52, 3) |
| HSL | hsl(13, 97%, 45%) |
| OKLCH | oklch(59.2% 0.213 33.8) |
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 #E03403 | 4.50:1 | AA | Lc -75.1 | Fine for body text |
| Black text on #E03403 | 4.66:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #E03403 text on white | 4.50:1 | AA | Lc 69.6 | Content text, not long reading |
| #E03403 text on black | 4.66:1 | AA | Lc -32.1 | Non-text elements, placeholder text |
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
#FEF3F0
oklch(97.2% 0.013 35.7)
-
Step 100
100
#FCE4DE
oklch(93.7% 0.028 34.3)
-
Step 200
200
#FACDC2
oklch(88.4% 0.053 34)
-
Step 300
300
#F8AA98
oklch(80.9% 0.096 33.5)
-
Step 400
400
#F0785E
oklch(70.6% 0.153 33.5)
-
Step 500
500
#E74D2C
oklch(63% 0.196 33.7)
-
Step 600
600 (this color)
#E03403
oklch(59.2% 0.213 33.8)
-
Step 700
700
#AF2500
oklch(49.1% 0.178 33.7)
-
Step 800
800
#901D00
oklch(42.6% 0.154 33.8)
-
Step 900
900
#771C08
oklch(37.7% 0.128 33.5)
-
Step 950
950
#461308
oklch(27% 0.081 33.9)
#E03403 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) | #6C5E00 | 0.224 |
| Deuteranopia (no green cones) | #968400 | 0.199 |
| Tritanopia (no blue cones) | #F7002E | 0.057 |
| Achromatopsia (no color) | #777777 | 0.214 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #E03403
#E03403
oklch(59.2% 0.213 33.8)
- #008DA3
#008DA3
oklch(59.1% 0.104 213.7)
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 #E03403, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Tomato Red #EC2D01 ΔE 0.023
- Deep Orange #DC4D01 ΔE 0.036
- Vermillion #F4320C ΔE 0.039
- Imperial Red #E63946 ΔE 0.047
- Red Pantone #EF233C ΔE 0.051
- Cherry Red #F7022A ΔE 0.055
- Faded Red #D3494E ΔE 0.056
- Crimson #DC143C ΔE 0.057
Use #E03403 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.