#10212F
Closest named color: Dark (#1B2431). oklch(24% 0.035 244.9), rgb(16, 33, 47).
Aa
White text reads best on this color (16.39:1).
About this color
#10212F is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.035 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.020 away. White text reads best on it, at 16.39:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.28:1 |
| White text | 16.39:1 |
Values
| HEX | #10212F |
| RGB | rgb(16, 33, 47) |
| HSL | hsl(207, 49%, 12%) |
| OKLCH | oklch(24% 0.035 244.9) |
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 #10212F | 16.39:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #10212F | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #10212F text on white | 16.39:1 | AAA | Lc 103.3 | Preferred for body text |
| #10212F text on black | 1.28:1 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE8
oklch(88.5% 0.023 246.1)
-
Step 300
300
#ABC4DA
oklch(80.9% 0.041 244.9)
-
Step 400
400
#7DA6C8
oklch(70.8% 0.067 243.9)
-
Step 500
500
#5B8FBA
oklch(63.1% 0.086 244.7)
-
Step 600
600
#4079A6
oklch(55.7% 0.092 244.4)
-
Step 700
700
#31658E
oklch(49% 0.086 244.7)
-
Step 800
800
#2A5374
oklch(42.8% 0.072 244.9)
-
Step 900
900
#27455D
oklch(37.8% 0.055 244.1)
-
Step 950
950 (this color)
#10212F
oklch(24% 0.035 244.9)
#10212F 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) | #1B2130 | 0.016 |
| Deuteranopia (no green cones) | #171E2F | 0.014 |
| Tritanopia (no blue cones) | #012426 | 0.029 |
| Achromatopsia (no color) | #1F1F1F | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10212F
#10212F
oklch(24% 0.035 244.9)
- #2B1C0C
#2B1C0C
oklch(24.1% 0.036 66.5)
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 #10212F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.020
- Rich Black #0D1B2A ΔE 0.023
- Oxford Blue #1B263B ΔE 0.032
- Jet #212529 ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.068
- Rich Navy #001219 ΔE 0.072
- Navy Blue #001146 ΔE 0.076
- Gunmetal #293241 ΔE 0.076
Use #10212F 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.