#191D3B
Closest named color: Oxford Blue (#1B263B). oklch(24.4% 0.057 275.6), rgb(25, 29, 59).
Aa
White text reads best on this color (16.40:1).
About this color
#191D3B is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.057 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.031 away. White text reads best on it, at 16.40:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.40:1 |
Values
| HEX | #191D3B |
| RGB | rgb(25, 29, 59) |
| HSL | hsl(233, 40%, 16%) |
| OKLCH | oklch(24.4% 0.057 275.6) |
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 #191D3B | 16.40:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #191D3B | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #191D3B text on white | 16.40:1 | AAA | Lc 103.3 | Preferred for body text |
| #191D3B text on black | 1.28:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F3
oklch(88.6% 0.038 275.7)
-
Step 300
300
#B4BEED
oklch(81% 0.067 275.4)
-
Step 400
400
#8E9BE4
oklch(70.8% 0.108 275.6)
-
Step 500
500
#7380DC
oklch(63.1% 0.138 275.6)
-
Step 600
600
#5D68C9
oklch(55.7% 0.149 275.6)
-
Step 700
700
#4D56AE
oklch(49.2% 0.139 275.7)
-
Step 800
800
#3F468D
oklch(42.6% 0.116 276.1)
-
Step 900
900
#353C71
oklch(37.8% 0.09 275.5)
-
Step 950
950 (this color)
#191D3B
oklch(24.4% 0.057 275.6)
#191D3B 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) | #11213C | 0.016 |
| Deuteranopia (no green cones) | #0D1E3A | 0.017 |
| Tritanopia (no blue cones) | #0B2329 | 0.049 |
| Achromatopsia (no color) | #1F1F1F | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #191D3B
#191D3B
oklch(24.4% 0.057 275.6)
- #282000
#282000
oklch(24.6% 0.05 95.4)
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 #191D3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.031
- Dark #1B2431 ΔE 0.035
- Rich Black #0D1B2A ΔE 0.039
- Jet #212529 ΔE 0.052
- Navy Blue #001146 ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.064
- Dark Indigo #1F0954 ΔE 0.067
- Midnight Purple #280137 ΔE 0.075
Use #191D3B 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.