#21173F
Closest named color: Dark Indigo (#1F0954). oklch(24.2% 0.073 291.5), rgb(33, 23, 63).
Aa
White text reads best on this color (16.67:1).
About this color
#21173F is a very dark, moderately saturated purple. In OKLCH its lightness is 24%, its chroma 0.073 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.049 away. White text reads best on it, at 16.67:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.073) |
| Temperature | in between |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.25:1 |
| White text | 16.67:1 |
Values
| HEX | #21173F |
| RGB | rgb(33, 23, 63) |
| HSL | hsl(255, 47%, 17%) |
| OKLCH | oklch(24.2% 0.073 291.5) |
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 #21173F | 16.67:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #21173F | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #21173F text on white | 16.67:1 | AAA | Lc 103.5 | Preferred for body text |
| #21173F 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#EAE7FA
oklch(93.6% 0.026 293.1)
-
Step 200
200
#D9D4F7
oklch(88.5% 0.048 291.9)
-
Step 300
300
#C1B7F5
oklch(80.9% 0.087 291.7)
-
Step 400
400
#A28FF0
oklch(70.7% 0.14 291.4)
-
Step 500
500
#8D70EA
oklch(63.1% 0.177 291.4)
-
Step 600
600
#7955D8
oklch(55.7% 0.192 291.6)
-
Step 700
700
#6644BC
oklch(49.2% 0.179 291.4)
-
Step 800
800
#533998
oklch(42.8% 0.148 291.5)
-
Step 900
900
#443279
oklch(37.7% 0.116 291.5)
-
Step 950
950 (this color)
#21173F
oklch(24.2% 0.073 291.5)
#21173F 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) | #041F40 | 0.045 |
| Deuteranopia (no green cones) | #051D3E | 0.043 |
| Tritanopia (no blue cones) | #192028 | 0.060 |
| Achromatopsia (no color) | #1E1E1E | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21173F
#21173F
oklch(24.2% 0.073 291.5)
- #212200
#212200
oklch(24.3% 0.054 111.4)
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 #21173F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.050
- Dark Purple #35063E ΔE 0.054
- Midnight Purple #280137 ΔE 0.054
- Dark #1B2431 ΔE 0.055
- Rich Black #0D1B2A ΔE 0.057
- Very Dark Purple #2A0134 ΔE 0.057
- Eggplant #380835 ΔE 0.060
Use #21173F 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.