#00172E
Closest named color: Rich Black (#0D1B2A). oklch(20.1% 0.056 249.2), rgb(0, 23, 46).
Aa
White text reads best on this color (18.07:1).
About this color
#00172E is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.056 and its hue 249°. 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 18.07:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.07:1 |
Values
| HEX | #00172E |
| RGB | rgb(0, 23, 46) |
| HSL | hsl(210, 100%, 9%) |
| OKLCH | oklch(20.1% 0.056 249.2) |
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 #00172E | 18.07:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #00172E | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #00172E text on white | 18.07:1 | AAA | Lc 104.6 | Preferred for body text |
| #00172E 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
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#A0C5EA
oklch(80.9% 0.066 248.6)
-
Step 400
400
#6BA6E0
oklch(70.8% 0.105 249.1)
-
Step 500
500
#3F8ED7
oklch(63.1% 0.135 249.3)
-
Step 600
600
#1477C4
oklch(55.7% 0.146 248.9)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#0A5189
oklch(42.6% 0.113 249.2)
-
Step 900
900
#14446E
oklch(37.8% 0.088 249)
-
Step 950
950 (this color)
#00172E
oklch(20.1% 0.056 249.2)
#00172E 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) | #0B192F | 0.018 |
| Deuteranopia (no green cones) | #04142E | 0.011 |
| Tritanopia (no blue cones) | #001D20 | 0.041 |
| Achromatopsia (no color) | #161616 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00172E
#00172E
oklch(20.1% 0.056 249.2)
- #231200
#231200
oklch(20.2% 0.044 69)
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 #00172E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Rich Navy #001219 ΔE 0.044
- Navy Blue #001146 ΔE 0.051
- Dark Navy #000435 ΔE 0.060
- Dark #1B2431 ΔE 0.064
- Dark Navy Blue #00022E ΔE 0.070
- Almost Black #070D0D ΔE 0.070
- Night Blue #040348 ΔE 0.070
Use #00172E 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.