#21173B
Closest named color: Oxford Blue (#1B263B). oklch(23.8% 0.067 293.5), rgb(33, 23, 59).
Aa
White text reads best on this color (16.79:1).
About this color
#21173B is a very dark, muted purple. In OKLCH its lightness is 24%, its chroma 0.067 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.048 away. White text reads best on it, at 16.79:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | muted (0.067) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.25:1 |
| White text | 16.79:1 |
Values
| HEX | #21173B |
| RGB | rgb(33, 23, 59) |
| HSL | hsl(257, 44%, 16%) |
| OKLCH | oklch(23.8% 0.067 293.5) |
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 #21173B | 16.79:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #21173B | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #21173B text on white | 16.79:1 | AAA | Lc 103.6 | Preferred for body text |
| #21173B text on black | 1.25:1 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#EAE7F8
oklch(93.5% 0.023 294.1)
-
Step 200
200
#DAD4F4
oklch(88.5% 0.044 294.1)
-
Step 300
300
#C2B7F0
oklch(80.8% 0.08 293.4)
-
Step 400
400
#A590E8
oklch(70.7% 0.127 293.9)
-
Step 500
500
#9072E1
oklch(63.1% 0.163 293.7)
-
Step 600
600
#7B58CE
oklch(55.6% 0.175 293.6)
-
Step 700
700
#6847B3
oklch(49.1% 0.164 293.5)
-
Step 800
800
#543B91
oklch(42.7% 0.136 293.2)
-
Step 900
900
#453473
oklch(37.7% 0.104 293.2)
-
Step 950
950 (this color)
#21173B
oklch(23.8% 0.067 293.5)
#21173B 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) | #081E3C | 0.041 |
| Deuteranopia (no green cones) | #0A1D3A | 0.039 |
| Tritanopia (no blue cones) | #1A1E26 | 0.053 |
| Achromatopsia (no color) | #1D1D1D | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21173B
#21173B
oklch(23.8% 0.067 293.5)
- #1F2100
#1F2100
oklch(23.8% 0.053 113)
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 #21173B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.048
- Dark #1B2431 ΔE 0.051
- Rich Black #0D1B2A ΔE 0.051
- Midnight Purple #280137 ΔE 0.054
- Dark Purple #35063E ΔE 0.055
- Very Dark Purple #2A0134 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.056
- Eggplant #380835 ΔE 0.059
Use #21173B 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.