#133E6E
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.095 254), rgb(19, 62, 110).
Aa
White text reads best on this color (10.81:1).
About this color
#133E6E is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.095 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #133E6E |
| RGB | rgb(19, 62, 110) |
| HSL | hsl(212, 71%, 25%) |
| OKLCH | oklch(36.2% 0.095 254) |
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 #133E6E | 10.81:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #133E6E | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #133E6E text on white | 10.81:1 | AAA | Lc 94.7 | Preferred for body text |
| #133E6E text on black | 1.94:1 | Fails | Lc -7.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A1C4EE
oklch(80.9% 0.071 253.2)
-
Step 400
400
#6DA4E6
oklch(70.8% 0.113 253.7)
-
Step 500
500
#438BDF
oklch(63.1% 0.146 254)
-
Step 600
600
#1F73CD
oklch(55.6% 0.159 254.1)
-
Step 700
700
#0F60B1
oklch(49% 0.147 253.9)
-
Step 800
800
#124F8F
oklch(42.7% 0.121 253.8)
-
Step 900
900 (this color)
#133E6E
oklch(36.2% 0.095 254)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#133E6E 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) | #264270 | 0.023 |
| Deuteranopia (no green cones) | #173A6D | 0.012 |
| Tritanopia (no blue cones) | #004950 | 0.071 |
| Achromatopsia (no color) | #3D3D3D | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133E6E
#133E6E
oklch(36.2% 0.095 254)
- #553600
#553600
oklch(36.1% 0.077 73.7)
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 #133E6E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.024
- Prussian Blue #1D3557 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.051
- Marine #042E60 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.057
- Midnight Green #073B4C ΔE 0.061
- Charcoal #264653 ΔE 0.061
Use #133E6E 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.