#133B88
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.137 261.8), rgb(19, 59, 136).
Aa
White text reads best on this color (10.45:1).
About this color
#133B88 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.137 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.034 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #133B88 |
| RGB | rgb(19, 59, 136) |
| HSL | hsl(219, 75%, 30%) |
| OKLCH | oklch(37.5% 0.137 261.8) |
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 #133B88 | 10.45:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #133B88 | 2.00:1 | Fails | Lc 10.2 | Not readable |
| #133B88 text on white | 10.45:1 | AAA | Lc 93.7 | Preferred for body text |
| #133B88 text on black | 2.00:1 | Fails | Lc -8.8 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEAFE
oklch(93.5% 0.03 262.5)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6A9EFF
oklch(70.6% 0.153 261.9)
-
Step 500
500
#4182FF
oklch(63.1% 0.198 261.8)
-
Step 600
600
#1965F5
oklch(55.6% 0.227 261.8)
-
Step 700
700
#0B52D6
oklch(49% 0.213 261.9)
-
Step 800
800
#0E45AD
oklch(42.8% 0.175 261.8)
-
Step 900
900 (this color)
#133B88
oklch(37.5% 0.137 261.8)
-
Step 950
950
#0D2450
oklch(27.1% 0.086 261.8)
#133B88 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) | #00458B | 0.027 |
| Deuteranopia (no green cones) | #003A87 | 0.011 |
| Tritanopia (no blue cones) | #004E5B | 0.105 |
| Achromatopsia (no color) | #3F3F3F | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133B88
#133B88
oklch(37.5% 0.137 261.8)
- #563C00
#563C00
oklch(37.6% 0.078 81.1)
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 #133B88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.034
- Cobalt #1E488F ΔE 0.040
- Marine Blue #01386A ΔE 0.054
- Sapphire #2138AB ΔE 0.060
- Light Navy #155084 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.068
- Blueberry #464196 ΔE 0.071
- Dusk Blue #26538D ΔE 0.073
Use #133B88 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.