#E5310C
Closest named color: Tomato Red (#EC2D01). oklch(59.9% 0.219 32.4), rgb(229, 49, 12).
Aa
Black text reads best on this color (4.77:1).
About this color
#E5310C is a medium-dark, vivid red. In OKLCH its lightness is 60%, its chroma 0.219 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Tomato Red (#EC2D01), ΔE 0.013 away. Black text reads best on it, at 4.77:1.
| Hue family | Reds |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.219) |
| Temperature | warm |
| Nearest name | Tomato Red (#EC2D01) |
| Black text | 4.77:1 |
| White text | 4.39:1 |
Values
| HEX | #E5310C |
| RGB | rgb(229, 49, 12) |
| HSL | hsl(10, 90%, 47%) |
| OKLCH | oklch(59.9% 0.219 32.4) |
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 #E5310C | 4.39:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #E5310C | 4.77:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #E5310C text on white | 4.39:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #E5310C text on black | 4.77:1 | AA | Lc -33.0 | 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 500.
-
Step 50
50
#FFF2EF
oklch(97.1% 0.015 33.1)
-
Step 100
100
#FEE3DD
oklch(93.6% 0.031 32.6)
-
Step 200
200
#FECCC1
oklch(88.6% 0.059 32.6)
-
Step 300
300
#FEA795
oklch(81% 0.107 32.3)
-
Step 400
400
#F87158
oklch(70.6% 0.171 32.2)
-
Step 500
500 (this color)
#E5310C
oklch(59.9% 0.219 32.4)
-
Step 600
600
#D12700
oklch(55.6% 0.208 32.5)
-
Step 700
700
#B11F00
oklch(49.1% 0.184 32.4)
-
Step 800
800
#931800
oklch(42.8% 0.16 32.4)
-
Step 900
900
#7B1200
oklch(37.6% 0.141 32.3)
-
Step 950
950
#490E05
oklch(27% 0.09 32.2)
#E5310C 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) | #6C5F00 | 0.234 |
| Deuteranopia (no green cones) | #988600 | 0.208 |
| Tritanopia (no blue cones) | #FD002D | 0.055 |
| Achromatopsia (no color) | #787878 | 0.220 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #E5310C
#E5310C
oklch(59.9% 0.219 32.4)
- #0090A4
#0090A4
oklch(60% 0.104 211.8)
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 #E5310C, closest first.
No curated palette has a color within ΔE 0.04 of #E5310C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Tomato Red #EC2D01 ΔE 0.013
- Vermillion #F4320C ΔE 0.030
- Deep Orange #DC4D01 ΔE 0.041
- Imperial Red #E63946 ΔE 0.041
- Red Pantone #EF233C ΔE 0.042
- Cherry Red #F7022A ΔE 0.046
- Fire Engine Red #FE0002 ΔE 0.049
- Red #FF0000 ΔE 0.050
Use #E5310C 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.