#10183E
Closest named color: Navy Blue (#001146). oklch(22.7% 0.073 270.6), rgb(16, 24, 62).
Aa
White text reads best on this color (17.18:1).
About this color
#10183E is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.073 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.036 away. White text reads best on it, at 17.18:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.22:1 |
| White text | 17.18:1 |
Values
| HEX | #10183E |
| RGB | rgb(16, 24, 62) |
| HSL | hsl(230, 59%, 15%) |
| OKLCH | oklch(22.7% 0.073 270.6) |
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 #10183E | 17.18:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #10183E | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #10183E text on white | 17.18:1 | AAA | Lc 103.9 | Preferred for body text |
| #10183E text on black | 1.22:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ABBEFA
oklch(80.9% 0.088 270.8)
-
Step 400
400
#809AF7
oklch(70.6% 0.139 270.7)
-
Step 500
500
#627EF3
oklch(63% 0.177 270.5)
-
Step 600
600
#4B64E2
oklch(55.6% 0.193 270.4)
-
Step 700
700
#3D52C4
oklch(49.1% 0.179 270.5)
-
Step 800
800
#32449F
oklch(42.7% 0.149 270.4)
-
Step 900
900
#2B3A7E
oklch(37.6% 0.116 270.5)
-
Step 950
950 (this color)
#10183E
oklch(22.7% 0.073 270.6)
#10183E 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) | #021D3F | 0.020 |
| Deuteranopia (no green cones) | #00193D | 0.020 |
| Tritanopia (no blue cones) | #002128 | 0.061 |
| Achromatopsia (no color) | #1B1B1B | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10183E
#10183E
oklch(22.7% 0.073 270.6)
- #251B00
#251B00
oklch(22.8% 0.047 89.6)
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 #10183E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.036
- Rich Black #0D1B2A ΔE 0.043
- Oxford Blue #1B263B ΔE 0.053
- Dark #1B2431 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.056
- Night Blue #040348 ΔE 0.059
- Dark Navy #000435 ΔE 0.072
- Midnight Purple #280137 ΔE 0.072
Use #10183E 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.