#101F2B
Closest named color: Rich Black (#0D1B2A). oklch(23.2% 0.031 243.8), rgb(16, 31, 43).
Aa
White text reads best on this color (16.76:1).
About this color
#101F2B is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.031 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 16.76:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.76:1 |
Values
| HEX | #101F2B |
| RGB | rgb(16, 31, 43) |
| HSL | hsl(207, 46%, 12%) |
| OKLCH | oklch(23.2% 0.031 243.8) |
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 #101F2B | 16.76:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #101F2B | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #101F2B text on white | 16.76:1 | AAA | Lc 103.6 | Preferred for body text |
| #101F2B text on black | 1.25:1 | 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
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ADC4D7
oklch(80.9% 0.037 243.1)
-
Step 400
400
#81A5C3
oklch(70.6% 0.059 243.9)
-
Step 500
500
#618FB4
oklch(63.2% 0.075 243.6)
-
Step 600
600
#4779A0
oklch(55.7% 0.082 243.5)
-
Step 700
700
#386589
oklch(49.1% 0.076 244.4)
-
Step 800
800
#2F536F
oklch(42.8% 0.063 243.5)
-
Step 900
900
#2A455A
oklch(37.8% 0.049 243)
-
Step 950
950 (this color)
#101F2B
oklch(23.2% 0.031 243.8)
#101F2B 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) | #1A1F2C | 0.016 |
| Deuteranopia (no green cones) | #161C2B | 0.013 |
| Tritanopia (no blue cones) | #042223 | 0.026 |
| Achromatopsia (no color) | #1E1E1E | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101F2B
#101F2B
oklch(23.2% 0.031 243.8)
- #281A0D
#281A0D
oklch(23.2% 0.032 63.1)
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 #101F2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Dark #1B2431 ΔE 0.027
- Jet #212529 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.041
- Rich Navy #001219 ΔE 0.064
- Space Cadet #2B2D42 ΔE 0.076
- Navy Blue #001146 ΔE 0.077
- Almost Black #070D0D ΔE 0.084
Use #101F2B 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.