#170B21
Closest named color: Rich Navy (#001219). oklch(18% 0.046 307.6), rgb(23, 11, 33).
Aa
White text reads best on this color (18.98:1).
About this color
#170B21 is a very dark, muted purple. In OKLCH its lightness is 18%, its chroma 0.046 and its hue 308°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.054 away. White text reads best on it, at 18.98:1.
| Hue family | Purples |
| Lightness | very dark (18%) |
| Chroma | muted (0.046) |
| Temperature | in between |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.10:1 |
| White text | 18.98:1 |
Values
| HEX | #170B21 |
| RGB | rgb(23, 11, 33) |
| HSL | hsl(273, 50%, 9%) |
| OKLCH | oklch(18% 0.046 307.6) |
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 #170B21 | 18.98:1 | AAA | Lc -107.4 | Preferred for body text |
| Black text on #170B21 | 1.10:1 | Fails | Lc 0.0 | Not readable |
| #170B21 text on white | 18.98:1 | AAA | Lc 105.3 | Preferred for body text |
| #170B21 text on black | 1.10:1 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EDE7F2
oklch(93.6% 0.016 310.1)
-
Step 200
200
#DED4E9
oklch(88.4% 0.03 307.1)
-
Step 300
300
#CAB8DD
oklch(81% 0.055 307.1)
-
Step 400
400
#AF92CB
oklch(70.6% 0.087 307.5)
-
Step 500
500
#9C76BE
oklch(63.1% 0.113 307.7)
-
Step 600
600
#875EAA
oklch(55.6% 0.122 307.8)
-
Step 700
700
#724D92
oklch(49.1% 0.113 307.5)
-
Step 800
800
#5D4076
oklch(42.8% 0.092 307.7)
-
Step 900
900
#4C365F
oklch(37.6% 0.073 307.9)
-
Step 950
950 (this color)
#170B21
oklch(18% 0.046 307.6)
#170B21 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) | #061022 | 0.035 |
| Deuteranopia (no green cones) | #081020 | 0.033 |
| Tritanopia (no blue cones) | #160F14 | 0.034 |
| Achromatopsia (no color) | #101010 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #170B21
#170B21
oklch(18% 0.046 307.6)
- #0C1500
#0C1500
oklch(18% 0.046 126.9)
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 #170B21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.054
- Rich Black #0D1B2A ΔE 0.055
- Almost Black #070D0D ΔE 0.057
- Very Dark Purple #2A0134 ΔE 0.062
- Midnight Purple #280137 ΔE 0.063
- Midnight #03012D ΔE 0.069
- Dark Navy #000435 ΔE 0.072
- Dark Navy Blue #00022E ΔE 0.074
Use #170B21 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.