#191F37
Closest named color: Dark (#1B2431). oklch(24.6% 0.047 272), rgb(25, 31, 55).
Aa
White text reads best on this color (16.24:1).
About this color
#191F37 is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.047 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.024 away. White text reads best on it, at 16.24:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.29:1 |
| White text | 16.24:1 |
Values
| HEX | #191F37 |
| RGB | rgb(25, 31, 55) |
| HSL | hsl(228, 38%, 16%) |
| OKLCH | oklch(24.6% 0.047 272) |
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 #191F37 | 16.24:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #191F37 | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #191F37 text on white | 16.24:1 | AAA | Lc 103.2 | Preferred for body text |
| #191F37 text on black | 1.29:1 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B4BFE5
oklch(80.9% 0.055 272.4)
-
Step 400
400
#8D9DD8
oklch(70.6% 0.089 272.3)
-
Step 500
500
#7284CE
oklch(63.1% 0.114 272.4)
-
Step 600
600
#5B6DBB
oklch(55.7% 0.123 272.1)
-
Step 700
700
#4B5BA1
oklch(49.2% 0.113 272)
-
Step 800
800
#3D4A82
oklch(42.6% 0.094 272)
-
Step 900
900
#343E69
oklch(37.6% 0.075 272.4)
-
Step 950
950 (this color)
#191F37
oklch(24.6% 0.047 272)
#191F37 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) | #162238 | 0.010 |
| Deuteranopia (no green cones) | #131F36 | 0.009 |
| Tritanopia (no blue cones) | #0E2428 | 0.041 |
| Achromatopsia (no color) | #202020 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #191F37
#191F37
oklch(24.6% 0.047 272)
- #292003
#292003
oklch(24.7% 0.046 91.8)
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 #191F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.024
- Oxford Blue #1B263B ΔE 0.024
- Rich Black #0D1B2A ΔE 0.034
- Jet #212529 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.059
- Navy Blue #001146 ΔE 0.067
- Gunmetal #293241 ΔE 0.071
- Dark Indigo #1F0954 ΔE 0.078
Use #191F37 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.