#101923
Closest named color: Rich Black (#0D1B2A). oklch(21% 0.024 251.6), rgb(16, 25, 35).
Aa
White text reads best on this color (17.71:1).
About this color
#101923 is a very dark close to neutral grey. In OKLCH its lightness is 21%, its chroma 0.024. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.014 away. White text reads best on it, at 17.71:1.
| Hue family | Neutrals |
| Lightness | very dark (21%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.71:1 |
Values
| HEX | #101923 |
| RGB | rgb(16, 25, 35) |
| HSL | hsl(212, 37%, 10%) |
| OKLCH | oklch(21% 0.024 251.6) |
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 #101923 | 17.71:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #101923 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #101923 text on white | 17.71:1 | AAA | Lc 104.5 | Preferred for body text |
| #101923 text on black | 1.18:1 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D2DAE3
oklch(88.5% 0.015 251.2)
-
Step 300
300
#B4C2D3
oklch(80.9% 0.029 253.3)
-
Step 400
400
#8CA3BD
oklch(70.7% 0.046 251.6)
-
Step 500
500
#708CAC
oklch(63.1% 0.058 252.1)
-
Step 600
600
#587698
oklch(55.6% 0.064 252.1)
-
Step 700
700
#486381
oklch(49.1% 0.058 251.6)
-
Step 800
800
#3B5169
oklch(42.7% 0.048 251.1)
-
Step 900
900
#334355
oklch(37.7% 0.037 251.8)
-
Step 950
950 (this color)
#101923
oklch(21% 0.024 251.6)
#101923 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) | #151923 | 0.008 |
| Deuteranopia (no green cones) | #131723 | 0.008 |
| Tritanopia (no blue cones) | #091B1C | 0.021 |
| Achromatopsia (no color) | #181818 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101923
#101923
oklch(21% 0.024 251.6)
- #1F160C
#1F160C
oklch(20.8% 0.023 68.9)
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 #101923, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.014
- Rich Navy #001219 ΔE 0.044
- Dark #1B2431 ΔE 0.048
- Jet #212529 ΔE 0.054
- Almost Black #070D0D ΔE 0.061
- Oxford Blue #1B263B ΔE 0.063
- Navy Blue #001146 ΔE 0.079
- Dark Navy #000435 ΔE 0.088
Use #101923 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.