#133571
Closest named color: Marine Blue (#01386A). oklch(34.2% 0.111 260.8), rgb(19, 53, 113).
Aa
White text reads best on this color (11.82:1).
About this color
#133571 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.111 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.019 away. White text reads best on it, at 11.82:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.77:1 |
| White text | 11.82:1 |
Values
| HEX | #133571 |
| RGB | rgb(19, 53, 113) |
| HSL | hsl(218, 71%, 26%) |
| OKLCH | oklch(34.2% 0.111 260.8) |
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 #133571 | 11.82:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #133571 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #133571 text on white | 11.82:1 | AAA | Lc 96.7 | Preferred for body text |
| #133571 text on black | 1.77:1 | 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 900.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C2F7
oklch(80.9% 0.083 260.4)
-
Step 400
400
#70A0F3
oklch(70.7% 0.133 260.8)
-
Step 500
500
#4A85EF
oklch(63% 0.171 261.1)
-
Step 600
600
#2C6CDD
oklch(55.5% 0.185 260.8)
-
Step 700
700
#1F5AC0
oklch(49.2% 0.172 260.7)
-
Step 800
800
#1C4A9B
oklch(42.7% 0.142 260.8)
-
Step 900
900 (this color)
#133571
oklch(34.2% 0.111 260.8)
-
Step 950
950
#112548
oklch(26.9% 0.07 260.7)
#133571 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) | #0F3C73 | 0.020 |
| Deuteranopia (no green cones) | #003370 | 0.014 |
| Tritanopia (no blue cones) | #00444D | 0.088 |
| Achromatopsia (no color) | #373737 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133571
#133571
oklch(34.2% 0.111 260.8)
- #4B3400
#4B3400
oklch(34.3% 0.071 81.3)
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 #133571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.019
- Marine #042E60 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.046
- Midnight Blue #191970 ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.071
- Midnight Green #073B4C ΔE 0.073
- Cobalt #1E488F ΔE 0.073
Use #133571 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.