#AE251B
Closest named color: Rufous (#AE2012). oklch(49.1% 0.175 29.3), rgb(174, 37, 27).
Aa
White text reads best on this color (6.81:1).
About this color
#AE251B is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.175 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.007 away. White text reads best on it, at 6.81:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.175) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 3.08:1 |
| White text | 6.81:1 |
Values
| HEX | #AE251B |
| RGB | rgb(174, 37, 27) |
| HSL | hsl(4, 73%, 39%) |
| OKLCH | oklch(49.1% 0.175 29.3) |
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 #AE251B | 6.81:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #AE251B | 3.08:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #AE251B text on white | 6.81:1 | AA | Lc 82.0 | Fine for body text |
| #AE251B text on black | 3.08:1 | AA large text | Lc -19.9 | 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FAE4E1
oklch(93.6% 0.025 26.9)
-
Step 200
200
#F7CEC7
oklch(88.5% 0.048 29.4)
-
Step 300
300
#F2ACA1
oklch(80.8% 0.084 29)
-
Step 400
400
#E97D6E
oklch(70.7% 0.136 29.2)
-
Step 500
500
#DE5747
oklch(63.1% 0.172 29.5)
-
Step 600
600
#CA3528
oklch(55.6% 0.188 29.4)
-
Step 700
700 (this color)
#AE251B
oklch(49.1% 0.175 29.3)
-
Step 800
800
#8D2219
oklch(42.7% 0.144 29.3)
-
Step 900
900
#72231B
oklch(37.8% 0.113 29.2)
-
Step 950
950
#431610
oklch(27% 0.071 30)
#AE251B 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) | #514818 | 0.187 |
| Deuteranopia (no green cones) | #726613 | 0.171 |
| Tritanopia (no blue cones) | #C00025 | 0.041 |
| Achromatopsia (no color) | #5B5B5B | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AE251B
#AE251B
oklch(49.1% 0.175 29.3)
- #006D7B
#006D7B
oklch(49% 0.085 210.2)
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 #AE251B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.007
- Firebrick #B22222 ΔE 0.011
- Rust Red #AA2704 ΔE 0.016
- Rusty Red #AF2F0D ΔE 0.019
- Brown #A52A2A ΔE 0.021
- Brick #A03623 ΔE 0.032
- Scarlet #BE0119 ΔE 0.035
- Burnt Red #9F2305 ΔE 0.035
Use #AE251B 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.