#191B2F
Closest named color: Rich Black (#0D1B2A). oklch(23.1% 0.039 278.5), rgb(25, 27, 47).
Aa
White text reads best on this color (16.94:1).
About this color
#191B2F is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.039 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 16.94:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.94:1 |
Values
| HEX | #191B2F |
| RGB | rgb(25, 27, 47) |
| HSL | hsl(235, 31%, 14%) |
| OKLCH | oklch(23.1% 0.039 278.5) |
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 #191B2F | 16.94:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #191B2F | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #191B2F text on white | 16.94:1 | AAA | Lc 103.8 | Preferred for body text |
| #191B2F text on black | 1.23:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D5D8EA
oklch(88.5% 0.025 278.3)
-
Step 300
300
#B9BEDF
oklch(80.8% 0.047 278.5)
-
Step 400
400
#969CCE
oklch(70.6% 0.073 279)
-
Step 500
500
#7D83C2
oklch(63% 0.095 279.1)
-
Step 600
600
#666CAE
oklch(55.5% 0.102 278.6)
-
Step 700
700
#555A96
oklch(49.1% 0.096 278.6)
-
Step 800
800
#464A79
oklch(42.7% 0.078 278.9)
-
Step 900
900
#3A3E62
oklch(37.7% 0.062 278.2)
-
Step 950
950 (this color)
#191B2F
oklch(23.1% 0.039 278.5)
#191B2F 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) | #141D30 | 0.010 |
| Deuteranopia (no green cones) | #131C2F | 0.010 |
| Tritanopia (no blue cones) | #131F22 | 0.035 |
| Achromatopsia (no color) | #1D1D1D | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #191B2F
#191B2F
oklch(23.1% 0.039 278.5)
- #221D06
#221D06
oklch(23.1% 0.038 97.3)
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 #191B2F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Dark #1B2431 ΔE 0.032
- Oxford Blue #1B263B ΔE 0.040
- Jet #212529 ΔE 0.044
- Navy Blue #001146 ΔE 0.069
- Rich Navy #001219 ΔE 0.070
- Space Cadet #2B2D42 ΔE 0.074
- Midnight Purple #280137 ΔE 0.076
Use #191B2F 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.