#133B5D
Closest named color: Prussian Blue (#1D3557). oklch(34.3% 0.074 247.8), rgb(19, 59, 93).
Aa
White text reads best on this color (11.59:1).
About this color
#133B5D is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.074 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.020 away. White text reads best on it, at 11.59:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #133B5D |
| RGB | rgb(19, 59, 93) |
| HSL | hsl(208, 66%, 22%) |
| OKLCH | oklch(34.3% 0.074 247.8) |
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 #133B5D | 11.59:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #133B5D | 1.81:1 | Fails | Lc 7.5 | Not readable |
| #133B5D text on white | 11.59:1 | AAA | Lc 96.4 | Preferred for body text |
| #133B5D text on black | 1.81:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A5C5E4
oklch(81% 0.056 247.7)
-
Step 400
400
#73A6D6
oklch(70.8% 0.089 247.7)
-
Step 500
500
#4C8FCB
oklch(63.2% 0.114 247.7)
-
Step 600
600
#2B78B8
oklch(55.7% 0.124 247.6)
-
Step 700
700
#1D649E
oklch(49% 0.115 248)
-
Step 800
800
#1B5280
oklch(42.7% 0.095 247.8)
-
Step 900
900 (this color)
#133B5D
oklch(34.3% 0.074 247.8)
-
Step 950
950
#12283C
oklch(26.9% 0.047 247.8)
#133B5D 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) | #2B3D5E | 0.028 |
| Deuteranopia (no green cones) | #21365C | 0.019 |
| Tritanopia (no blue cones) | #004347 | 0.055 |
| Achromatopsia (no color) | #393939 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133B5D
#133B5D
oklch(34.3% 0.074 247.8)
- #513001
#513001
oklch(34.2% 0.074 68.5)
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 #133B5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.020
- Marine Blue #01386A ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.030
- Midnight Green #073B4C ΔE 0.033
- Marine #042E60 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.046
- Charcoal #264653 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
Use #133B5D 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.