#172133
Closest named color: Dark (#1B2431). oklch(24.8% 0.037 261.7), rgb(23, 33, 51).
Aa
White text reads best on this color (16.13:1).
About this color
#172133 is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.037 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.014 away. White text reads best on it, at 16.13:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.30:1 |
| White text | 16.13:1 |
Values
| HEX | #172133 |
| RGB | rgb(23, 33, 51) |
| HSL | hsl(219, 38%, 15%) |
| OKLCH | oklch(24.8% 0.037 261.7) |
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 #172133 | 16.13:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #172133 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #172133 text on white | 16.13:1 | AAA | Lc 103.0 | Preferred for body text |
| #172133 text on black | 1.30:1 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B1C1DE
oklch(80.8% 0.045 262.4)
-
Step 400
400
#88A1CD
oklch(70.6% 0.071 261.6)
-
Step 500
500
#6B8AC1
oklch(63.2% 0.091 261.5)
-
Step 600
600
#5373AD
oklch(55.7% 0.098 261.7)
-
Step 700
700
#436095
oklch(49.1% 0.092 261.7)
-
Step 800
800
#374F78
oklch(42.8% 0.075 260.7)
-
Step 900
900
#304161
oklch(37.6% 0.059 262.4)
-
Step 950
950 (this color)
#172133
oklch(24.8% 0.037 261.7)
#172133 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) | #1A2234 | 0.006 |
| Deuteranopia (no green cones) | #172033 | 0.004 |
| Tritanopia (no blue cones) | #0C2527 | 0.034 |
| Achromatopsia (no color) | #212121 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172133
#172133
oklch(24.8% 0.037 261.7)
- #2A1F0A
#2A1F0A
oklch(24.7% 0.038 81.6)
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 #172133, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.014
- Oxford Blue #1B263B ΔE 0.022
- Rich Black #0D1B2A ΔE 0.031
- Jet #212529 ΔE 0.032
- Space Cadet #2B2D42 ΔE 0.059
- Gunmetal #293241 ΔE 0.068
- Navy Blue #001146 ΔE 0.075
- Rich Navy #001219 ΔE 0.082
Use #172133 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.