#101B2B
Closest named color: Rich Black (#0D1B2A). oklch(22% 0.035 257.7), rgb(16, 27, 43).
Aa
White text reads best on this color (17.30:1).
About this color
#101B2B is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.035 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.005 away. White text reads best on it, at 17.30:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.30:1 |
Values
| HEX | #101B2B |
| RGB | rgb(16, 27, 43) |
| HSL | hsl(216, 46%, 12%) |
| OKLCH | oklch(22% 0.035 257.7) |
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 #101B2B | 17.30:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #101B2B | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #101B2B text on white | 17.30:1 | AAA | Lc 104.1 | Preferred for body text |
| #101B2B text on black | 1.21:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE9
oklch(88.5% 0.023 258.4)
-
Step 300
300
#B0C2DC
oklch(80.9% 0.042 257.5)
-
Step 400
400
#87A2CB
oklch(70.7% 0.068 258.6)
-
Step 500
500
#688BBD
oklch(63.1% 0.086 257.3)
-
Step 600
600
#5074A9
oklch(55.5% 0.093 257.9)
-
Step 700
700
#406191
oklch(48.9% 0.087 257.7)
-
Step 800
800
#355076
oklch(42.8% 0.072 257)
-
Step 900
900
#2E425F
oklch(37.6% 0.056 257.6)
-
Step 950
950 (this color)
#101B2B
oklch(22% 0.035 257.7)
#101B2B 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) | #151C2C | 0.009 |
| Deuteranopia (no green cones) | #12192B | 0.007 |
| Tritanopia (no blue cones) | #041F21 | 0.032 |
| Achromatopsia (no color) | #1B1B1B | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101B2B
#101B2B
oklch(22% 0.035 257.7)
- #241806
#241806
oklch(22% 0.036 75.8)
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 #101B2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.005
- Dark #1B2431 ΔE 0.038
- Jet #212529 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.049
- Rich Navy #001219 ΔE 0.055
- Navy Blue #001146 ΔE 0.068
- Almost Black #070D0D ΔE 0.075
- Dark Navy #000435 ΔE 0.086
Use #101B2B 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.