#171933
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.05 278.3), rgb(23, 25, 51).
Aa
White text reads best on this color (17.16:1).
About this color
#171933 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.050 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.026 away. White text reads best on it, at 17.16:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.16:1 |
Values
| HEX | #171933 |
| RGB | rgb(23, 25, 51) |
| HSL | hsl(236, 38%, 15%) |
| OKLCH | oklch(22.6% 0.05 278.3) |
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 #171933 | 17.16:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #171933 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #171933 text on white | 17.16:1 | AAA | Lc 104.0 | Preferred for body text |
| #171933 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D4D8EF
oklch(88.6% 0.032 277.9)
-
Step 300
300
#B7BDE7
oklch(80.8% 0.06 278.6)
-
Step 400
400
#939BDB
oklch(70.8% 0.094 278.2)
-
Step 500
500
#7981D2
oklch(63.2% 0.122 278)
-
Step 600
600
#6369BF
oklch(55.7% 0.132 278.2)
-
Step 700
700
#5257A5
oklch(49.2% 0.123 278.1)
-
Step 800
800
#434785
oklch(42.6% 0.102 278.4)
-
Step 900
900
#383C6B
oklch(37.6% 0.08 278.1)
-
Step 950
950 (this color)
#171933
oklch(22.6% 0.05 278.3)
#171933 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) | #0F1C34 | 0.015 |
| Deuteranopia (no green cones) | #0D1A32 | 0.016 |
| Tritanopia (no blue cones) | #0D1E23 | 0.043 |
| Achromatopsia (no color) | #1B1B1B | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171933
#171933
oklch(22.6% 0.05 278.3)
- #221C00
#221C00
oklch(22.7% 0.047 98)
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 #171933, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Dark #1B2431 ΔE 0.041
- Oxford Blue #1B263B ΔE 0.045
- Jet #212529 ΔE 0.055
- Navy Blue #001146 ΔE 0.058
- Midnight Purple #280137 ΔE 0.069
- Very Dark Purple #2A0134 ΔE 0.071
- Rich Navy #001219 ΔE 0.071
Use #171933 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.