#133D5E
Closest named color: Prussian Blue (#1D3557). oklch(34.9% 0.074 246.1), rgb(19, 61, 94).
Aa
White text reads best on this color (11.30:1).
About this color
#133D5E is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.074 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 11.30:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.85:1 |
| White text | 11.30:1 |
Values
| HEX | #133D5E |
| RGB | rgb(19, 61, 94) |
| HSL | hsl(206, 66%, 22%) |
| OKLCH | oklch(34.9% 0.074 246.1) |
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 #133D5E | 11.30:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #133D5E | 1.85:1 | Fails | Lc 8.1 | Not readable |
| #133D5E text on white | 11.30:1 | AAA | Lc 95.8 | Preferred for body text |
| #133D5E text on black | 1.85:1 | 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
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A4C5E3
oklch(80.9% 0.055 246)
-
Step 400
400
#71A6D5
oklch(70.6% 0.089 246.2)
-
Step 500
500
#498FCA
oklch(63% 0.114 246.3)
-
Step 600
600
#2878B6
oklch(55.5% 0.123 246.3)
-
Step 700
700
#19659D
oklch(49.1% 0.114 246.1)
-
Step 800
800
#18537F
oklch(42.8% 0.094 245.5)
-
Step 900
900 (this color)
#133D5E
oklch(34.9% 0.074 246.1)
-
Step 950
950
#11283C
oklch(26.9% 0.047 246.9)
#133D5E 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) | #2E3E5F | 0.030 |
| Deuteranopia (no green cones) | #23375D | 0.022 |
| Tritanopia (no blue cones) | #004549 | 0.053 |
| Achromatopsia (no color) | #3A3A3A | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133D5E
#133D5E
oklch(34.9% 0.074 246.1)
- #543105
#543105
oklch(34.9% 0.074 65.5)
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 #133D5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.030
- Marine Blue #01386A ΔE 0.031
- Midnight Green #073B4C ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.040
- Charcoal #264653 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.049
- Marine #042E60 ΔE 0.051
Use #133D5E 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.