#001639
Closest named color: Navy Blue (#001146). oklch(20.8% 0.075 257.3), rgb(0, 22, 57).
Aa
White text reads best on this color (17.88:1).
About this color
#001639 is a very dark, moderately saturated blue. In OKLCH its lightness is 21%, its chroma 0.075 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.029 away. White text reads best on it, at 17.88:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.17:1 |
| White text | 17.88:1 |
Values
| HEX | #001639 |
| RGB | rgb(0, 22, 57) |
| HSL | hsl(217, 100%, 11%) |
| OKLCH | oklch(20.8% 0.075 257.3) |
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 #001639 | 17.88:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #001639 | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #001639 text on white | 17.88:1 | AAA | Lc 104.3 | Preferred for body text |
| #001639 text on black | 1.17:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9CC3FA
oklch(80.9% 0.089 257)
-
Step 400
400
#65A1F8
oklch(70.6% 0.143 257.7)
-
Step 500
500
#3787F4
oklch(63.1% 0.181 257.3)
-
Step 600
600
#066DE3
oklch(55.5% 0.198 257.4)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#024B9F
oklch(42.7% 0.151 257.1)
-
Step 900
900
#103F7F
oklch(37.6% 0.119 257.7)
-
Step 950
950 (this color)
#001639
oklch(20.8% 0.075 257.3)
#001639 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) | #001A3A | 0.013 |
| Deuteranopia (no green cones) | #001538 | 0.004 |
| Tritanopia (no blue cones) | #001F24 | 0.058 |
| Achromatopsia (no color) | #171717 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001639
#001639
oklch(20.8% 0.075 257.3)
- #231500
#231500
oklch(20.9% 0.044 77.5)
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 #001639, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.029
- Rich Black #0D1B2A ΔE 0.041
- Night Blue #040348 ΔE 0.051
- Dark Navy #000435 ΔE 0.053
- Very Dark Blue #000133 ΔE 0.065
- Rich Navy #001219 ΔE 0.065
- Dark Navy Blue #00022E ΔE 0.067
- Dark #1B2431 ΔE 0.069
Use #001639 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.