#101423
Closest named color: Rich Black (#0D1B2A). oklch(19.5% 0.031 271.9), rgb(16, 20, 35).
Aa
White text reads best on this color (18.31:1).
About this color
#101423 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.031 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.026 away. White text reads best on it, at 18.31:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.14:1 |
| White text | 18.31:1 |
Values
| HEX | #101423 |
| RGB | rgb(16, 20, 35) |
| HSL | hsl(227, 37%, 10%) |
| OKLCH | oklch(19.5% 0.031 271.9) |
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 #101423 | 18.31:1 | AAA | Lc -107.1 | Preferred for body text |
| Black text on #101423 | 1.14:1 | Fails | Lc 0.0 | Not readable |
| #101423 text on white | 18.31:1 | AAA | Lc 105.0 | Preferred for body text |
| #101423 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF1
oklch(93.7% 0.01 267.4)
-
Step 200
200
#D4D9E7
oklch(88.6% 0.02 270.2)
-
Step 300
300
#B8C0D9
oklch(81% 0.036 271.5)
-
Step 400
400
#939FC6
oklch(70.7% 0.059 271.5)
-
Step 500
500
#7987B8
oklch(63.1% 0.076 271.8)
-
Step 600
600
#6270A3
oklch(55.5% 0.081 271.8)
-
Step 700
700
#515E8C
oklch(49.1% 0.076 271.3)
-
Step 800
800
#434D72
oklch(42.8% 0.063 272)
-
Step 900
900
#38405C
oklch(37.7% 0.049 271.6)
-
Step 950
950 (this color)
#101423
oklch(19.5% 0.031 271.9)
#101423 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) | #0F1624 | 0.007 |
| Deuteranopia (no green cones) | #0D1423 | 0.005 |
| Tritanopia (no blue cones) | #0A1719 | 0.028 |
| Achromatopsia (no color) | #151515 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101423
#101423
oklch(19.5% 0.031 271.9)
- #1A1404
#1A1404
oklch(19.4% 0.031 90.4)
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 #101423, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Rich Navy #001219 ΔE 0.037
- Almost Black #070D0D ΔE 0.052
- Dark #1B2431 ΔE 0.063
- Jet #212529 ΔE 0.071
- Navy Blue #001146 ΔE 0.073
- Dark Navy #000435 ΔE 0.074
- Oxford Blue #1B263B ΔE 0.075
Use #101423 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.