#AA2100
Closest named color: Rust Red (#AA2704). oklch(47.9% 0.176 33.1), rgb(170, 33, 0).
Aa
White text reads best on this color (7.17:1).
About this color
#AA2100 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.176 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Rust Red (#AA2704), ΔE 0.007 away. White text reads best on it, at 7.17:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.176) |
| Temperature | warm |
| Nearest name | Rust Red (#AA2704) |
| Black text | 2.92:1 |
| White text | 7.17:1 |
Values
| HEX | #AA2100 |
| RGB | rgb(170, 33, 0) |
| HSL | hsl(12, 100%, 33%) |
| OKLCH | oklch(47.9% 0.176 33.1) |
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 #AA2100 | 7.17:1 | AAA | Lc -88.2 | Fine for body text |
| Black text on #AA2100 | 2.92:1 | Fails | Lc 20.8 | Dividers and decoration only |
| #AA2100 text on white | 7.17:1 | AAA | Lc 83.2 | Fine for body text |
| #AA2100 text on black | 2.92:1 | Fails | Lc -18.7 | 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
#FAE4DF
oklch(93.5% 0.025 32.9)
-
Step 200
200
#F7CFC5
oklch(88.6% 0.047 34.3)
-
Step 300
300
#F2AD9D
oklch(80.9% 0.085 33.5)
-
Step 400
400
#E97E67
oklch(70.7% 0.137 33.3)
-
Step 500
500
#DF583D
oklch(63.2% 0.174 33.2)
-
Step 600
600
#CA3617
oklch(55.6% 0.189 33.2)
-
Step 700
700 (this color)
#AA2100
oklch(47.9% 0.176 33.1)
-
Step 800
800
#8D230C
oklch(42.7% 0.145 33.4)
-
Step 900
900
#722314
oklch(37.7% 0.114 32.8)
-
Step 950
950
#43160D
oklch(27% 0.072 33.1)
#AA2100 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) | #4F4400 | 0.185 |
| Deuteranopia (no green cones) | #706200 | 0.165 |
| Tritanopia (no blue cones) | #BC001D | 0.044 |
| Achromatopsia (no color) | #575757 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AA2100
#AA2100
oklch(47.9% 0.176 33.1)
- #006979
#006979
oklch(47.8% 0.084 212.8)
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 #AA2100, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rust Red #AA2704 ΔE 0.007
- Rufous #AE2012 ΔE 0.012
- Burnt Red #9F2305 ΔE 0.023
- Rusty Red #AF2F0D ΔE 0.023
- Firebrick #B22222 ΔE 0.027
- Brown #A52A2A ΔE 0.028
- Brick #A03623 ΔE 0.032
- Russet #A13905 ΔE 0.037
Use #AA2100 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.