#21172A
Closest named color: Rich Black (#0D1B2A). oklch(22.7% 0.038 307.7), rgb(33, 23, 42).
Aa
White text reads best on this color (17.20:1).
About this color
#21172A is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.038 and its hue 308°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.036 away. White text reads best on it, at 17.20:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.038) |
| Temperature | in between |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.20:1 |
Values
| HEX | #21172A |
| RGB | rgb(33, 23, 42) |
| HSL | hsl(272, 29%, 13%) |
| OKLCH | oklch(22.7% 0.038 307.7) |
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 #21172A | 17.20:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #21172A | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #21172A text on white | 17.20:1 | AAA | Lc 104.0 | Preferred for body text |
| #21172A text on black | 1.22:1 | Fails | Lc 0.0 | Not readable |
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 950.
-
Step 50
50
#F6F4F9
oklch(97% 0.007 304.2)
-
Step 100
100
#ECE8F1
oklch(93.7% 0.013 306)
-
Step 200
200
#DED5E6
oklch(88.5% 0.025 309.3)
-
Step 300
300
#C9B9D8
oklch(80.9% 0.046 308.5)
-
Step 400
400
#AD95C4
oklch(70.7% 0.072 307.8)
-
Step 500
500
#997AB5
oklch(63.1% 0.093 307.9)
-
Step 600
600
#8462A1
oklch(55.6% 0.102 308.2)
-
Step 700
700
#6F518A
oklch(49% 0.095 307.5)
-
Step 800
800
#5B4370
oklch(42.8% 0.078 307.9)
-
Step 900
900
#4A395B
oklch(37.8% 0.06 306.6)
-
Step 950
950 (this color)
#21172A
oklch(22.7% 0.038 307.7)
#21172A 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) | #131B2B | 0.028 |
| Deuteranopia (no green cones) | #151B29 | 0.026 |
| Tritanopia (no blue cones) | #201A1E | 0.029 |
| Achromatopsia (no color) | #1B1B1B | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21172A
#21172A
oklch(22.7% 0.038 307.7)
- #171F0B
#171F0B
oklch(22.5% 0.037 127.1)
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 #21172A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.036
- Dark #1B2431 ΔE 0.043
- Jet #212529 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.053
- Very Dark Purple #2A0134 ΔE 0.064
- Eggplant #380835 ΔE 0.065
- Midnight Purple #280137 ΔE 0.065
- Dark Purple #35063E ΔE 0.070
Use #21172A 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.