#01397E
Closest named color: Twilight Blue (#0A437A). oklch(35.8% 0.129 257.5), rgb(1, 57, 126).
Aa
White text reads best on this color (11.12:1).
About this color
#01397E is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.129 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 11.12:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.88:1 |
| White text | 11.12:1 |
Values
| HEX | #01397E |
| RGB | rgb(1, 57, 126) |
| HSL | hsl(213, 98%, 25%) |
| OKLCH | oklch(35.8% 0.129 257.5) |
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 #01397E | 11.12:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #01397E | 1.88:1 | Fails | Lc 8.9 | Not readable |
| #01397E text on white | 11.12:1 | AAA | Lc 95.0 | Preferred for body text |
| #01397E text on black | 1.88:1 | Fails | Lc -7.6 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFD
oklch(88.5% 0.054 257.1)
-
Step 300
300
#99C3FF
oklch(80.9% 0.097 257.3)
-
Step 400
400
#5FA1FF
oklch(70.7% 0.154 257.4)
-
Step 500
500
#2C85FD
oklch(63% 0.197 257.6)
-
Step 600
600
#006DE6
oklch(55.7% 0.202 257.5)
-
Step 700
700
#005BC3
oklch(49.1% 0.179 257.6)
-
Step 800
800
#004AA1
oklch(42.6% 0.155 257.6)
-
Step 900
900 (this color)
#01397E
oklch(35.8% 0.129 257.5)
-
Step 950
950
#08254D
oklch(26.9% 0.082 257.6)
#01397E 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) | #014180 | 0.023 |
| Deuteranopia (no green cones) | #00367D | 0.009 |
| Tritanopia (no blue cones) | #004A55 | 0.097 |
| Achromatopsia (no color) | #3B3B3B | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01397E
#01397E
oklch(35.8% 0.129 257.5)
- #523700
#523700
oklch(35.9% 0.075 78.1)
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 #01397E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Marine Blue #01386A ΔE 0.035
- Cobalt #1E488F ΔE 0.056
- Marine #042E60 ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.068
- Light Navy #155084 ΔE 0.070
- Royal #0C1793 ΔE 0.077
- Sapphire #2138AB ΔE 0.079
Use #01397E 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.