#133C85
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.131 261), rgb(19, 60, 133).
Aa
White text reads best on this color (10.43:1).
About this color
#133C85 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.131 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 10.43:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.43:1 |
Values
| HEX | #133C85 |
| RGB | rgb(19, 60, 133) |
| HSL | hsl(218, 75%, 30%) |
| OKLCH | oklch(37.5% 0.131 261) |
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 #133C85 | 10.43:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #133C85 | 2.01:1 | Fails | Lc 10.2 | Not readable |
| #133C85 text on white | 10.43:1 | AAA | Lc 93.7 | Preferred for body text |
| #133C85 text on black | 2.01:1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFE
oklch(88.4% 0.055 261.2)
-
Step 300
300
#9EC2FF
oklch(81% 0.095 260.8)
-
Step 400
400
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3D83FF
oklch(63.2% 0.198 260.8)
-
Step 600
600
#1867F0
oklch(55.5% 0.219 261)
-
Step 700
700
#0955D1
oklch(49.2% 0.203 260.9)
-
Step 800
800
#0D46A9
oklch(42.7% 0.169 261.1)
-
Step 900
900 (this color)
#133C85
oklch(37.5% 0.131 261)
-
Step 950
950
#0D244E
oklch(27% 0.083 261.2)
#133C85 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) | #024588 | 0.025 |
| Deuteranopia (no green cones) | #003B84 | 0.011 |
| Tritanopia (no blue cones) | #004E5A | 0.101 |
| Achromatopsia (no color) | #404040 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133C85
#133C85
oklch(37.5% 0.131 261)
- #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 #133C85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Cobalt #1E488F ΔE 0.039
- Marine Blue #01386A ΔE 0.049
- Light Navy #155084 ΔE 0.059
- Sapphire #2138AB ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.068
- Deep Sea Blue #015482 ΔE 0.071
- Dusk Blue #26538D ΔE 0.071
Use #133C85 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.