#10151F
Closest named color: Rich Black (#0D1B2A). oklch(19.6% 0.022 263.9), rgb(16, 21, 31).
Aa
White text reads best on this color (18.27:1).
About this color
#10151F is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.027 away. White text reads best on it, at 18.27:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.14:1 |
| White text | 18.27:1 |
Values
| HEX | #10151F |
| RGB | rgb(16, 21, 31) |
| HSL | hsl(220, 32%, 9%) |
| OKLCH | oklch(19.6% 0.022 263.9) |
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 #10151F | 18.27:1 | AAA | Lc -107.1 | Preferred for body text |
| Black text on #10151F | 1.14:1 | Fails | Lc 0.0 | Not readable |
| #10151F text on white | 18.27:1 | AAA | Lc 104.9 | Preferred for body text |
| #10151F text on black | 1.14:1 | 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
#D4D9E3
oklch(88.4% 0.015 264.5)
-
Step 300
300
#B8C1D2
oklch(80.9% 0.026 263.3)
-
Step 400
400
#94A1BB
oklch(70.8% 0.041 264.3)
-
Step 500
500
#798AAA
oklch(63.2% 0.052 263)
-
Step 600
600
#627395
oklch(55.5% 0.057 263.9)
-
Step 700
700
#51617F
oklch(49.1% 0.052 262.7)
-
Step 800
800
#434F68
oklch(42.8% 0.044 264.6)
-
Step 900
900
#384254
oklch(37.8% 0.034 262.1)
-
Step 950
950 (this color)
#10151F
oklch(19.6% 0.022 263.9)
#10151F 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) | #12161F | 0.005 |
| Deuteranopia (no green cones) | #10141F | 0.004 |
| Tritanopia (no blue cones) | #0B1718 | 0.020 |
| Achromatopsia (no color) | #151515 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10151F
#10151F
oklch(19.6% 0.022 263.9)
- #1A1409
#1A1409
oklch(19.5% 0.022 82)
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 #10151F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.027
- Rich Navy #001219 ΔE 0.034
- Almost Black #070D0D ΔE 0.048
- Dark #1B2431 ΔE 0.063
- Jet #212529 ΔE 0.068
- Oxford Blue #1B263B ΔE 0.076
- Navy Blue #001146 ΔE 0.082
- Dark Navy #000435 ΔE 0.082
Use #10151F 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.