#170D21
Closest named color: Rich Black (#0D1B2A). oklch(18.4% 0.042 305.8), rgb(23, 13, 33).
Aa
White text reads best on this color (18.81:1).
About this color
#170D21 is a very dark, muted purple. In OKLCH its lightness is 18%, its chroma 0.042 and its hue 306°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.049 away. White text reads best on it, at 18.81:1.
| Hue family | Purples |
| Lightness | very dark (18%) |
| Chroma | muted (0.042) |
| Temperature | in between |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.11:1 |
| White text | 18.81:1 |
Values
| HEX | #170D21 |
| RGB | rgb(23, 13, 33) |
| HSL | hsl(270, 43%, 9%) |
| OKLCH | oklch(18.4% 0.042 305.8) |
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 #170D21 | 18.81:1 | AAA | Lc -107.3 | Preferred for body text |
| Black text on #170D21 | 1.11:1 | Fails | Lc 0.0 | Not readable |
| #170D21 text on white | 18.81:1 | AAA | Lc 105.3 | Preferred for body text |
| #170D21 text on black | 1.11:1 | 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
#ECE8F2
oklch(93.7% 0.014 304.1)
-
Step 200
200
#DDD5E8
oklch(88.5% 0.027 304.8)
-
Step 300
300
#C8B9DB
oklch(80.9% 0.05 305.3)
-
Step 400
400
#AC94C8
oklch(70.6% 0.079 305.5)
-
Step 500
500
#9879BA
oklch(63% 0.101 305.6)
-
Step 600
600
#8361A6
oklch(55.6% 0.11 305.8)
-
Step 700
700
#6F508E
oklch(49.1% 0.102 306)
-
Step 800
800
#5A4274
oklch(42.7% 0.085 305.2)
-
Step 900
900
#4A385D
oklch(37.7% 0.065 305.8)
-
Step 950
950 (this color)
#170D21
oklch(18.4% 0.042 305.8)
#170D21 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) | #081122 | 0.030 |
| Deuteranopia (no green cones) | #0A1220 | 0.029 |
| Tritanopia (no blue cones) | #151015 | 0.030 |
| Achromatopsia (no color) | #111111 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #170D21
#170D21
oklch(18.4% 0.042 305.8)
- #0E1602
#0E1602
oklch(18.6% 0.042 126.5)
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 #170D21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.049
- Rich Navy #001219 ΔE 0.051
- Almost Black #070D0D ΔE 0.056
- Very Dark Purple #2A0134 ΔE 0.064
- Midnight Purple #280137 ΔE 0.065
- Midnight #03012D ΔE 0.072
- Dark Navy #000435 ΔE 0.074
- Very Dark Brown #1D0200 ΔE 0.075
Use #170D21 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.