#133C4E
Closest named color: Midnight Green (#073B4C). oklch(33.7% 0.055 230.5), rgb(19, 60, 78).
Aa
White text reads best on this color (11.77:1).
About this color
#133C4E is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.055 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.010 away. White text reads best on it, at 11.77:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.78:1 |
| White text | 11.77:1 |
Values
| HEX | #133C4E |
| RGB | rgb(19, 60, 78) |
| HSL | hsl(198, 61%, 19%) |
| OKLCH | oklch(33.7% 0.055 230.5) |
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 #133C4E | 11.77:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #133C4E | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #133C4E text on white | 11.77:1 | AAA | Lc 96.8 | Preferred for body text |
| #133C4E text on black | 1.78:1 | 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
#A7C6D7
oklch(80.9% 0.041 231.9)
-
Step 400
400
#76A9C2
oklch(70.8% 0.065 230)
-
Step 500
500
#4F93B3
oklch(63.1% 0.084 230.5)
-
Step 600
600
#2F7D9F
oklch(55.7% 0.091 230.5)
-
Step 700
700
#206988
oklch(49.1% 0.085 230.7)
-
Step 800
800
#1D566E
oklch(42.7% 0.07 229.7)
-
Step 900
900 (this color)
#133C4E
oklch(33.7% 0.055 230.5)
-
Step 950
950
#132A34
oklch(27.1% 0.034 228.3)
#133C4E 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) | #333B4F | 0.038 |
| Deuteranopia (no green cones) | #2B354E | 0.033 |
| Tritanopia (no blue cones) | #004142 | 0.033 |
| Achromatopsia (no color) | #383838 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133C4E
#133C4E
oklch(33.7% 0.055 230.5)
- #4E2E1C
#4E2E1C
oklch(33.7% 0.055 49.4)
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 #133C4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.010
- Dark Blue Grey #1F3B4D ΔE 0.011
- Prussian Blue #1D3557 ΔE 0.032
- Gunmetal #293241 ΔE 0.039
- Charcoal #264653 ΔE 0.040
- Onyx #343A40 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.052
Use #133C4E 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.