#0A1D3F
Closest named color: Rich Black (#0D1B2A). oklch(23.7% 0.07 261), rgb(10, 29, 63).
Aa
White text reads best on this color (16.66:1).
About this color
#0A1D3F is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.070 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.040 away. White text reads best on it, at 16.66:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.66:1 |
Values
| HEX | #0A1D3F |
| RGB | rgb(10, 29, 63) |
| HSL | hsl(218, 73%, 14%) |
| OKLCH | oklch(23.7% 0.07 261) |
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 #0A1D3F | 16.66:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #0A1D3F | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #0A1D3F text on white | 16.66:1 | AAA | Lc 103.4 | Preferred for body text |
| #0A1D3F text on black | 1.26:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A3C2F7
oklch(81% 0.083 261)
-
Step 400
400
#71A0F2
oklch(70.7% 0.131 261)
-
Step 500
500
#4B86EE
oklch(63.2% 0.168 260.8)
-
Step 600
600
#2E6CDC
oklch(55.5% 0.183 261.1)
-
Step 700
700
#215ABF
oklch(49.1% 0.17 260.9)
-
Step 800
800
#1D4A9B
oklch(42.7% 0.141 261)
-
Step 900
900
#1D3F7B
oklch(37.8% 0.11 260.8)
-
Step 950
950 (this color)
#0A1D3F
oklch(23.7% 0.07 261)
#0A1D3F 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) | #0B2140 | 0.013 |
| Deuteranopia (no green cones) | #011C3E | 0.011 |
| Tritanopia (no blue cones) | #00252A | 0.056 |
| Achromatopsia (no color) | #1E1E1E | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1D3F
#0A1D3F
oklch(23.7% 0.07 261)
- #2A1C00
#2A1C00
oklch(23.8% 0.049 82.5)
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 #0A1D3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.040
- Oxford Blue #1B263B ΔE 0.042
- Navy Blue #001146 ΔE 0.042
- Dark #1B2431 ΔE 0.047
- Jet #212529 ΔE 0.065
- Dark Indigo #1F0954 ΔE 0.066
- Night Blue #040348 ΔE 0.069
- Marine #042E60 ΔE 0.076
Use #0A1D3F 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.