#02172D
Closest named color: Rich Black (#0D1B2A). oklch(20.1% 0.053 250.6), rgb(2, 23, 45).
Aa
White text reads best on this color (18.05:1).
About this color
#02172D is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.053 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.024 away. White text reads best on it, at 18.05:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.05:1 |
Values
| HEX | #02172D |
| RGB | rgb(2, 23, 45) |
| HSL | hsl(211, 91%, 9%) |
| OKLCH | oklch(20.1% 0.053 250.6) |
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 #02172D | 18.05:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #02172D | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #02172D text on white | 18.05:1 | AAA | Lc 104.6 | Preferred for body text |
| #02172D text on black | 1.16:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E8
oklch(80.8% 0.062 250.8)
-
Step 400
400
#70A5DD
oklch(70.7% 0.1 250.7)
-
Step 500
500
#488DD3
oklch(63% 0.127 250.8)
-
Step 600
600
#2676C0
oklch(55.6% 0.138 250.5)
-
Step 700
700
#1763A6
oklch(49.1% 0.128 250.4)
-
Step 800
800
#175187
oklch(42.8% 0.107 250.7)
-
Step 900
900
#1A436C
oklch(37.6% 0.084 251.1)
-
Step 950
950 (this color)
#02172D
oklch(20.1% 0.053 250.6)
#02172D 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) | #0C182E | 0.015 |
| Deuteranopia (no green cones) | #05142D | 0.011 |
| Tritanopia (no blue cones) | #001C1F | 0.038 |
| Achromatopsia (no color) | #161616 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #02172D
#02172D
oklch(20.1% 0.053 250.6)
- #221200
#221200
oklch(20% 0.043 70.9)
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 #02172D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.024
- Rich Navy #001219 ΔE 0.043
- Navy Blue #001146 ΔE 0.053
- Dark #1B2431 ΔE 0.062
- Dark Navy #000435 ΔE 0.062
- Almost Black #070D0D ΔE 0.068
- Oxford Blue #1B263B ΔE 0.069
- Dark Navy Blue #00022E ΔE 0.071
Use #02172D 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.