#133F80
Closest named color: Twilight Blue (#0A437A). oklch(37.8% 0.12 258.7), rgb(19, 63, 128).
Aa
White text reads best on this color (10.24:1).
About this color
#133F80 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.120 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.017 away. White text reads best on it, at 10.24:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.24:1 |
Values
| HEX | #133F80 |
| RGB | rgb(19, 63, 128) |
| HSL | hsl(216, 74%, 29%) |
| OKLCH | oklch(37.8% 0.12 258.7) |
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 #133F80 | 10.24:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #133F80 | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #133F80 text on white | 10.24:1 | AAA | Lc 93.3 | Preferred for body text |
| #133F80 text on black | 2.05:1 | Fails | Lc -9.2 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DBFB
oklch(88.6% 0.05 258.7)
-
Step 300
300
#9DC2FB
oklch(80.8% 0.091 258.9)
-
Step 400
400
#67A1F9
oklch(70.8% 0.143 258.5)
-
Step 500
500
#3B86F6
oklch(63.1% 0.183 258.6)
-
Step 600
600
#146CE5
oklch(55.6% 0.2 258.7)
-
Step 700
700
#0259C7
oklch(49% 0.186 258.7)
-
Step 800
800
#0A4AA1
oklch(42.8% 0.154 258.6)
-
Step 900
900 (this color)
#133F80
oklch(37.8% 0.12 258.7)
-
Step 950
950
#0D254B
oklch(27% 0.077 259.3)
#133F80 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) | #184682 | 0.021 |
| Deuteranopia (no green cones) | #003C7F | 0.015 |
| Tritanopia (no blue cones) | #004F59 | 0.093 |
| Achromatopsia (no color) | #414141 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133F80
#133F80
oklch(37.8% 0.12 258.7)
- #583C00
#583C00
oklch(37.8% 0.079 79.1)
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 #133F80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.017
- Cobalt #1E488F ΔE 0.037
- Marine Blue #01386A ΔE 0.044
- Light Navy #155084 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.061
- Dusk Blue #26538D ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.073
Use #133F80 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.