#E3531F
Closest named color: Deep Orange (#DC4D01). oklch(63% 0.189 38.2), rgb(227, 83, 31).
Aa
Black text reads best on this color (5.52:1).
About this color
#E3531F is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.189 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Deep Orange (#DC4D01), ΔE 0.021 away. Black text reads best on it, at 5.52:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.189) |
| Temperature | warm |
| Nearest name | Deep Orange (#DC4D01) |
| Black text | 5.52:1 |
| White text | 3.80:1 |
Values
| HEX | #E3531F |
| RGB | rgb(227, 83, 31) |
| HSL | hsl(16, 78%, 51%) |
| OKLCH | oklch(63% 0.189 38.2) |
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 #E3531F | 3.80:1 | AA large text | Lc -70.0 | Content text, not long reading |
| Black text on #E3531F | 5.52:1 | AA | Lc 39.6 | Non-text elements, placeholder text |
| #E3531F text on white | 3.80:1 | AA large text | Lc 64.5 | Content text, not long reading |
| #E3531F text on black | 5.52:1 | AA | Lc -37.2 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FBE4DD
oklch(93.6% 0.027 37.6)
-
Step 200
200
#F9CEC1
oklch(88.5% 0.052 37.5)
-
Step 300
300
#F5AC95
oklch(80.8% 0.092 38.2)
-
Step 400
400
#ED7C58
oklch(70.7% 0.148 38.3)
-
Step 500
500 (this color)
#E3531F
oklch(63% 0.189 38.2)
-
Step 600
600
#C63E00
oklch(55.6% 0.181 38.2)
-
Step 700
700
#A73300
oklch(49% 0.16 38.2)
-
Step 800
800
#8A2900
oklch(42.7% 0.139 38.4)
-
Step 900
900
#742100
oklch(37.7% 0.122 38.4)
-
Step 950
950
#451505
oklch(27.1% 0.078 38.4)
#E3531F 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) | #7D6E15 | 0.190 |
| Deuteranopia (no green cones) | #A08F16 | 0.173 |
| Tritanopia (no blue cones) | #FA294A | 0.082 |
| Achromatopsia (no color) | #838383 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #E3531F
#E3531F
oklch(63% 0.189 38.2)
- #0099B7
#0099B7
oklch(63.1% 0.114 218.3)
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 #E3531F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Orange #DC4D01 ΔE 0.021
- Pale Red #D9544D ΔE 0.044
- Rusty Orange #CD5909 ΔE 0.044
- Orangey Red #FA4224 ΔE 0.046
- Orange Pant #FB5607 ΔE 0.047
- Vermillion #F4320C ΔE 0.048
- Tomato Red #EC2D01 ΔE 0.049
- Blood Orange #FE4B03 ΔE 0.049
Use #E3531F 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.