#131739
Closest named color: Rich Black (#0D1B2A). oklch(22.3% 0.065 274.8), rgb(19, 23, 57).
Aa
White text reads best on this color (17.36:1).
About this color
#131739 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.065 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.036 away. White text reads best on it, at 17.36:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.36:1 |
Values
| HEX | #131739 |
| RGB | rgb(19, 23, 57) |
| HSL | hsl(234, 50%, 15%) |
| OKLCH | oklch(22.3% 0.065 274.8) |
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 #131739 | 17.36:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #131739 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #131739 text on white | 17.36:1 | AAA | Lc 104.1 | Preferred for body text |
| #131739 text on black | 1.20:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F6
oklch(88.6% 0.042 273.7)
-
Step 300
300
#B1BDF3
oklch(80.8% 0.078 274.8)
-
Step 400
400
#8A9AED
oklch(70.8% 0.123 274.5)
-
Step 500
500
#6F7EE8
oklch(63.2% 0.159 274.9)
-
Step 600
600
#5965D6
oklch(55.7% 0.172 274.8)
-
Step 700
700
#4953B9
oklch(49.1% 0.159 274.7)
-
Step 800
800
#3C4496
oklch(42.7% 0.133 275.1)
-
Step 900
900
#333A77
oklch(37.6% 0.103 275.4)
-
Step 950
950 (this color)
#131739
oklch(22.3% 0.065 274.8)
#131739 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) | #051C3A | 0.022 |
| Deuteranopia (no green cones) | #011938 | 0.024 |
| Tritanopia (no blue cones) | #011F25 | 0.058 |
| Achromatopsia (no color) | #1A1A1A | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #131739
#131739
oklch(22.3% 0.065 274.8)
- #221B00
#221B00
oklch(22.4% 0.046 95.7)
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 #131739, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.036
- Navy Blue #001146 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.053
- Dark #1B2431 ΔE 0.053
- Dark Indigo #1F0954 ΔE 0.061
- Night Blue #040348 ΔE 0.064
- Midnight Purple #280137 ΔE 0.067
- Jet #212529 ΔE 0.069
Use #131739 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.