#133D87
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.133 260.9), rgb(19, 61, 135).
Aa
White text reads best on this color (10.26:1).
About this color
#133D87 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.133 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 10.26:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.26:1 |
Values
| HEX | #133D87 |
| RGB | rgb(19, 61, 135) |
| HSL | hsl(218, 75%, 30%) |
| OKLCH | oklch(37.9% 0.133 260.9) |
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 #133D87 | 10.26:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #133D87 | 2.04:1 | Fails | Lc 10.6 | Not readable |
| #133D87 text on white | 10.26:1 | AAA | Lc 93.3 | Preferred for body text |
| #133D87 text on black | 2.04:1 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
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
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3C83FF
oklch(63.2% 0.198 260.7)
-
Step 600
600
#1567F1
oklch(55.6% 0.221 260.9)
-
Step 700
700
#0554D2
oklch(49% 0.206 260.9)
-
Step 800
800
#0B46AA
oklch(42.7% 0.171 260.9)
-
Step 900
900 (this color)
#133D87
oklch(37.9% 0.133 260.9)
-
Step 950
950
#0C244F
oklch(27% 0.085 261)
#133D87 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) | #02468A | 0.025 |
| Deuteranopia (no green cones) | #003C86 | 0.011 |
| Tritanopia (no blue cones) | #004F5C | 0.101 |
| Achromatopsia (no color) | #414141 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133D87
#133D87
oklch(37.9% 0.133 260.9)
- #573D00
#573D00
oklch(37.9% 0.078 81.4)
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 #133D87, 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 0.035
- Marine Blue #01386A ΔE 0.053
- Light Navy #155084 ΔE 0.056
- Sapphire #2138AB ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.067
- Dusk Blue #26538D ΔE 0.068
- Deep Sea Blue #015482 ΔE 0.068
Use #133D87 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.