#133B4D
Closest named color: Midnight Green (#073B4C). oklch(33.3% 0.054 231.1), rgb(19, 59, 77).
Aa
White text reads best on this color (11.92:1).
About this color
#133B4D is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.054 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.008 away. White text reads best on it, at 11.92:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.76:1 |
| White text | 11.92:1 |
Values
| HEX | #133B4D |
| RGB | rgb(19, 59, 77) |
| HSL | hsl(199, 60%, 19%) |
| OKLCH | oklch(33.3% 0.054 231.1) |
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 #133B4D | 11.92:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #133B4D | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #133B4D text on white | 11.92:1 | AAA | Lc 97.1 | Preferred for body text |
| #133B4D text on black | 1.76:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2EBF0
oklch(93.5% 0.012 231.7)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A7C6D6
oklch(80.9% 0.04 230.3)
-
Step 400
400
#76A8C2
oklch(70.6% 0.065 231.5)
-
Step 500
500
#5093B3
oklch(63.2% 0.083 230.8)
-
Step 600
600
#317C9F
oklch(55.5% 0.091 232)
-
Step 700
700
#226988
oklch(49.2% 0.084 231.1)
-
Step 800
800
#1F566E
oklch(42.8% 0.069 230.3)
-
Step 900
900 (this color)
#133B4D
oklch(33.3% 0.054 231.1)
-
Step 950
950
#142934
oklch(26.9% 0.034 232.8)
#133B4D 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) | #323A4E | 0.037 |
| Deuteranopia (no green cones) | #2A344D | 0.032 |
| Tritanopia (no blue cones) | #004041 | 0.033 |
| Achromatopsia (no color) | #373737 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133B4D
#133B4D
oklch(33.3% 0.054 231.1)
- #4C2E1B
#4C2E1B
oklch(33.4% 0.054 52.3)
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 #133B4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.008
- Dark Blue Grey #1F3B4D ΔE 0.011
- Prussian Blue #1D3557 ΔE 0.031
- Gunmetal #293241 ΔE 0.037
- Onyx #343A40 ΔE 0.043
- Charcoal #264653 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.050
Use #133B4D 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.