#101728
Closest named color: Rich Black (#0D1B2A). oklch(20.7% 0.036 266.3), rgb(16, 23, 40).
Aa
White text reads best on this color (17.86:1).
About this color
#101728 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.036 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.014 away. White text reads best on it, at 17.86:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.86:1 |
Values
| HEX | #101728 |
| RGB | rgb(16, 23, 40) |
| HSL | hsl(223, 43%, 11%) |
| OKLCH | oklch(20.7% 0.036 266.3) |
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 #101728 | 17.86:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #101728 | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #101728 text on white | 17.86:1 | AAA | Lc 104.6 | Preferred for body text |
| #101728 text on black | 1.17:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B4C1DD
oklch(81% 0.042 265.7)
-
Step 400
400
#8DA0CC
oklch(70.7% 0.068 266.5)
-
Step 500
500
#7188BE
oklch(63% 0.086 266.3)
-
Step 600
600
#5A71AB
oklch(55.6% 0.095 266.9)
-
Step 700
700
#4A5F92
oklch(49.2% 0.086 266.3)
-
Step 800
800
#3C4E77
oklch(42.8% 0.072 265.4)
-
Step 900
900
#344160
oklch(37.8% 0.056 266.4)
-
Step 950
950 (this color)
#101728
oklch(20.7% 0.036 266.3)
#101728 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) | #111929 | 0.008 |
| Deuteranopia (no green cones) | #0E1628 | 0.005 |
| Tritanopia (no blue cones) | #071B1D | 0.033 |
| Achromatopsia (no color) | #171717 | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101728
#101728
oklch(20.7% 0.036 266.3)
- #1F1603
#1F1603
oklch(20.6% 0.036 85.3)
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 #101728, 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 0.046
- Dark #1B2431 ΔE 0.052
- Jet #212529 ΔE 0.061
- Oxford Blue #1B263B ΔE 0.062
- Almost Black #070D0D ΔE 0.064
- Navy Blue #001146 ΔE 0.067
- Dark Navy #000435 ΔE 0.076
Use #101728 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.