#133F7E
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.117 258.2), rgb(19, 63, 126).
Aa
White text reads best on this color (10.29:1).
About this color
#133F7E is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.117 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.015 away. White text reads best on it, at 10.29:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.03:1 |
| White text | 10.29:1 |
Values
| HEX | #133F7E |
| RGB | rgb(19, 63, 126) |
| HSL | hsl(215, 74%, 28%) |
| OKLCH | oklch(37.6% 0.117 258.2) |
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 #133F7E | 10.29:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #133F7E | 2.03:1 | Fails | Lc 10.5 | Not readable |
| #133F7E text on white | 10.29:1 | AAA | Lc 93.4 | Preferred for body text |
| #133F7E text on black | 2.03:1 | Fails | Lc -9.1 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9EC3FA
oklch(81% 0.088 258.1)
-
Step 400
400
#67A1F7
oklch(70.7% 0.141 258.1)
-
Step 500
500
#3C86F3
oklch(63% 0.179 258.3)
-
Step 600
600
#156DE2
oklch(55.6% 0.195 258.2)
-
Step 700
700
#035AC5
oklch(49.1% 0.182 258.3)
-
Step 800
800
#0A4A9F
oklch(42.6% 0.151 258.3)
-
Step 900
900 (this color)
#133F7E
oklch(37.6% 0.117 258.2)
-
Step 950
950
#0D264A
oklch(27.1% 0.074 257.9)
#133F7E 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) | #1A4680 | 0.022 |
| Deuteranopia (no green cones) | #003C7D | 0.015 |
| Tritanopia (no blue cones) | #004E58 | 0.089 |
| Achromatopsia (no color) | #404040 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133F7E
#133F7E
oklch(37.6% 0.117 258.2)
- #583B00
#583B00
oklch(37.6% 0.078 77.7)
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 #133F7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.015
- Cobalt #1E488F ΔE 0.039
- Marine Blue #01386A ΔE 0.042
- Light Navy #155084 ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.061
- Dusk Blue #26538D ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.070
Use #133F7E 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.