#10212E
Closest named color: Dark (#1B2431). oklch(24% 0.034 242.9), rgb(16, 33, 46).
Aa
White text reads best on this color (16.41:1).
About this color
#10212E is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.034 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.021 away. White text reads best on it, at 16.41:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.27:1 |
| White text | 16.41:1 |
Values
| HEX | #10212E |
| RGB | rgb(16, 33, 46) |
| HSL | hsl(206, 48%, 12%) |
| OKLCH | oklch(24% 0.034 242.9) |
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 #10212E | 16.41:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #10212E | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #10212E text on white | 16.41:1 | AAA | Lc 103.3 | Preferred for body text |
| #10212E text on black | 1.27:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#ABC4D9
oklch(80.8% 0.04 243.6)
-
Step 400
400
#7EA6C6
oklch(70.8% 0.064 242.9)
-
Step 500
500
#5C8FB7
oklch(63% 0.082 243.2)
-
Step 600
600
#4079A3
oklch(55.6% 0.089 242.6)
-
Step 700
700
#32668C
oklch(49.2% 0.083 242.7)
-
Step 800
800
#2A5372
oklch(42.7% 0.069 243.3)
-
Step 900
900
#27455C
oklch(37.8% 0.053 243)
-
Step 950
950 (this color)
#10212E
oklch(24% 0.034 242.9)
#10212E 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) | #1B212F | 0.016 |
| Deuteranopia (no green cones) | #171E2E | 0.014 |
| Tritanopia (no blue cones) | #012425 | 0.029 |
| Achromatopsia (no color) | #1F1F1F | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10212E
#10212E
oklch(24% 0.034 242.9)
- #2B1B0D
#2B1B0D
oklch(23.9% 0.035 61.1)
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 #10212E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.021
- Rich Black #0D1B2A ΔE 0.023
- Jet #212529 ΔE 0.033
- Oxford Blue #1B263B ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.069
- Rich Navy #001219 ΔE 0.072
- Gunmetal #293241 ΔE 0.076
- Navy Blue #001146 ΔE 0.077
Use #10212E 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.