#191B37
Closest named color: Rich Black (#0D1B2A). oklch(23.6% 0.053 278.4), rgb(25, 27, 55).
Aa
White text reads best on this color (16.75:1).
About this color
#191B37 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.053 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.033 away. White text reads best on it, at 16.75:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.75:1 |
Values
| HEX | #191B37 |
| RGB | rgb(25, 27, 55) |
| HSL | hsl(236, 38%, 16%) |
| OKLCH | oklch(23.6% 0.053 278.4) |
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 #191B37 | 16.75:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #191B37 | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #191B37 text on white | 16.75:1 | AAA | Lc 103.6 | Preferred for body text |
| #191B37 text on black | 1.25:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D3D7F1
oklch(88.4% 0.036 278.7)
-
Step 300
300
#B7BDEA
oklch(80.9% 0.064 278.9)
-
Step 400
400
#929ADF
oklch(70.7% 0.101 278.4)
-
Step 500
500
#7980D6
oklch(63.2% 0.129 278.5)
-
Step 600
600
#6267C3
oklch(55.5% 0.141 278.4)
-
Step 700
700
#5256A9
oklch(49.2% 0.13 278.4)
-
Step 800
800
#434689
oklch(42.7% 0.109 278.8)
-
Step 900
900
#383C6D
oklch(37.8% 0.083 278.1)
-
Step 950
950 (this color)
#191B37
oklch(23.6% 0.053 278.4)
#191B37 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) | #101F38 | 0.017 |
| Deuteranopia (no green cones) | #0E1C36 | 0.017 |
| Tritanopia (no blue cones) | #0E2126 | 0.047 |
| Achromatopsia (no color) | #1E1E1E | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #191B37
#191B37
oklch(23.6% 0.053 278.4)
- #241E00
#241E00
oklch(23.5% 0.049 98.6)
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 #191B37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.033
- Dark #1B2431 ΔE 0.036
- Oxford Blue #1B263B ΔE 0.037
- Jet #212529 ΔE 0.052
- Navy Blue #001146 ΔE 0.059
- Dark Indigo #1F0954 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.070
- Midnight Purple #280137 ΔE 0.071
Use #191B37 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.