#AA1731
Closest named color: Rouge (#AB1239). oklch(47.7% 0.178 19.4), rgb(170, 23, 49).
Aa
White text reads best on this color (7.30:1).
About this color
#AA1731 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.178 and its hue 19°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.012 away. White text reads best on it, at 7.30:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.178) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.87:1 |
| White text | 7.30:1 |
Values
| HEX | #AA1731 |
| RGB | rgb(170, 23, 49) |
| HSL | hsl(349, 76%, 38%) |
| OKLCH | oklch(47.7% 0.178 19.4) |
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 #AA1731 | 7.30:1 | AAA | Lc -88.5 | Fine for body text |
| Black text on #AA1731 | 2.87:1 | Fails | Lc 20.5 | Dividers and decoration only |
| #AA1731 text on white | 7.30:1 | AAA | Lc 83.5 | Fine for body text |
| #AA1731 text on black | 2.87:1 | Fails | Lc -18.4 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E3
oklch(93.6% 0.024 20.7)
-
Step 200
200
#F7CDCC
oklch(88.4% 0.048 19.7)
-
Step 300
300
#F3ABAA
oklch(80.9% 0.085 20)
-
Step 400
400
#EA7A7D
oklch(70.7% 0.138 19.5)
-
Step 500
500
#E0525D
oklch(63.1% 0.177 19.3)
-
Step 600
600
#CB2E43
oklch(55.6% 0.192 19.4)
-
Step 700
700 (this color)
#AA1731
oklch(47.7% 0.178 19.4)
-
Step 800
800
#8E1D2C
oklch(42.7% 0.147 19.5)
-
Step 900
900
#722028
oklch(37.7% 0.115 19.2)
-
Step 950
950
#431418
oklch(26.9% 0.073 18.4)
#AA1731 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) | #484331 | 0.197 |
| Deuteranopia (no green cones) | #6B612C | 0.180 |
| Tritanopia (no blue cones) | #BB0023 | 0.036 |
| Achromatopsia (no color) | #565656 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AA1731
#AA1731
oklch(47.7% 0.178 19.4)
- #006A6E
#006A6E
oklch(47.6% 0.081 199.4)
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 #AA1731, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.012
- Brown #A52A2A ΔE 0.026
- Firebrick #B22222 ΔE 0.031
- Auburn #9B2226 ΔE 0.034
- Rufous #AE2012 ΔE 0.035
- Cranberry #9E003A ΔE 0.039
- Raspberry #B00149 ΔE 0.040
- Carmine #9D0216 ΔE 0.042
Use #AA1731 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.