#101621
Closest named color: Rich Black (#0D1B2A). oklch(20% 0.024 262.2), rgb(16, 22, 33).
Aa
White text reads best on this color (18.12:1).
About this color
#101621 is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.024. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 18.12:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.12:1 |
Values
| HEX | #101621 |
| RGB | rgb(16, 22, 33) |
| HSL | hsl(219, 35%, 10%) |
| OKLCH | oklch(20% 0.024 262.2) |
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 #101621 | 18.12:1 | AAA | Lc -107.0 | Preferred for body text |
| Black text on #101621 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #101621 text on white | 18.12:1 | AAA | Lc 104.8 | Preferred for body text |
| #101621 text on black | 1.15:1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3D9E4
oklch(88.4% 0.016 262.7)
-
Step 300
300
#B7C1D4
oklch(80.9% 0.029 263.4)
-
Step 400
400
#91A1BE
oklch(70.6% 0.046 262.3)
-
Step 500
500
#768AAD
oklch(63.1% 0.058 261.5)
-
Step 600
600
#5F7499
oklch(55.7% 0.063 261.5)
-
Step 700
700
#4E6183
oklch(49.1% 0.06 261.8)
-
Step 800
800
#404F6A
oklch(42.6% 0.049 261.9)
-
Step 900
900
#374256
oklch(37.8% 0.037 262.2)
-
Step 950
950 (this color)
#101621
oklch(20% 0.024 262.2)
#101621 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) | #121721 | 0.005 |
| Deuteranopia (no green cones) | #101521 | 0.004 |
| Tritanopia (no blue cones) | #0A181A | 0.021 |
| Achromatopsia (no color) | #161616 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101621
#101621
oklch(20% 0.024 262.2)
- #1B1509
#1B1509
oklch(19.9% 0.024 83.9)
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 #101621, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Rich Navy #001219 ΔE 0.037
- Almost Black #070D0D ΔE 0.052
- Dark #1B2431 ΔE 0.058
- Jet #212529 ΔE 0.064
- Oxford Blue #1B263B ΔE 0.072
- Navy Blue #001146 ΔE 0.079
- Dark Navy #000435 ΔE 0.082
Use #101621 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.