#172B33
Closest named color: Dark (#1B2431). oklch(27.6% 0.03 225.5), rgb(23, 43, 51).
Aa
White text reads best on this color (14.68:1).
About this color
#172B33 is a dark close to neutral grey. In OKLCH its lightness is 28%, its chroma 0.030. It has too little chroma to lean warm or cool. The nearest named color is Dark (#1B2431), ΔE 0.024 away. White text reads best on it, at 14.68:1.
| Hue family | Neutrals |
| Lightness | dark (28%) |
| Chroma | close to neutral grey (0.030) |
| Temperature | neutral |
| Nearest name | Dark (#1B2431) |
| Black text | 1.42:1 |
| White text | 14.68:1 |
Values
| HEX | #172B33 |
| RGB | rgb(23, 43, 51) |
| HSL | hsl(197, 38%, 15%) |
| OKLCH | oklch(27.6% 0.03 225.5) |
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 #172B33 | 14.68:1 | AAA | Lc -104.3 | Preferred for body text |
| Black text on #172B33 | 1.42:1 | Fails | Lc 0.0 | Not readable |
| #172B33 text on white | 14.68:1 | AAA | Lc 101.5 | Preferred for body text |
| #172B33 text on black | 1.42:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CCDCE3
oklch(88.5% 0.02 225.7)
-
Step 300
300
#A9C6D2
oklch(80.9% 0.036 224.7)
-
Step 400
400
#7BA8BC
oklch(70.6% 0.056 227.2)
-
Step 500
500
#5793AB
oklch(63.2% 0.072 225.7)
-
Step 600
600
#397D96
oklch(55.6% 0.078 225.1)
-
Step 700
700
#2B6980
oklch(49.1% 0.073 225.7)
-
Step 800
800
#255668
oklch(42.7% 0.06 225)
-
Step 900
900
#244755
oklch(37.8% 0.047 226.2)
-
Step 950
950 (this color)
#172B33
oklch(27.6% 0.03 225.5)
#172B33 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) | #272A33 | 0.024 |
| Deuteranopia (no green cones) | #222733 | 0.020 |
| Tritanopia (no blue cones) | #0A2D2E | 0.019 |
| Achromatopsia (no color) | #282828 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172B33
#172B33
oklch(27.6% 0.03 225.5)
- #34231C
#34231C
oklch(27.5% 0.029 43.3)
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 #172B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.024
- Jet #212529 ΔE 0.025
- Oxford Blue #1B263B ΔE 0.027
- Space Cadet #2B2D42 ΔE 0.043
- Gunmetal #293241 ΔE 0.043
- Rich Black #0D1B2A ΔE 0.060
- Midnight Green #073B4C ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.066
Use #172B33 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.