#1F366E
Closest named color: Marine Blue (#01386A). oklch(34.8% 0.101 264.8), rgb(31, 54, 110).
Aa
White text reads best on this color (11.59:1).
About this color
#1F366E is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.101 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.024 away. White text reads best on it, at 11.59:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #1F366E |
| RGB | rgb(31, 54, 110) |
| HSL | hsl(223, 56%, 28%) |
| OKLCH | oklch(34.8% 0.101 264.8) |
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 #1F366E | 11.59:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #1F366E | 1.81:1 | Fails | Lc 7.5 | Not readable |
| #1F366E text on white | 11.59:1 | AAA | Lc 96.4 | Preferred for body text |
| #1F366E text on black | 1.81:1 | Fails | Lc 0.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CBD9F6
oklch(88.4% 0.043 265)
-
Step 300
300
#A9C1F3
oklch(81% 0.076 264.7)
-
Step 400
400
#7B9EED
oklch(70.6% 0.123 265.2)
-
Step 500
500
#5A84E7
oklch(63.1% 0.156 265)
-
Step 600
600
#416CD5
oklch(55.7% 0.169 264.7)
-
Step 700
700
#3359B9
oklch(49.1% 0.158 264.9)
-
Step 800
800
#2B4995
oklch(42.6% 0.13 265.1)
-
Step 900
900 (this color)
#1F366E
oklch(34.8% 0.101 264.8)
-
Step 950
950
#172546
oklch(27.1% 0.064 265.1)
#1F366E 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) | #183D70 | 0.020 |
| Deuteranopia (no green cones) | #04356D | 0.022 |
| Tritanopia (no blue cones) | #00434C | 0.083 |
| Achromatopsia (no color) | #393939 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F366E
#1F366E
oklch(34.8% 0.101 264.8)
- #4B3600
#4B3600
oklch(34.7% 0.071 84.3)
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 #1F366E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.024
- Twilight Blue #0A437A ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.041
- Marine #042E60 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.068
- Midnight Green #073B4C ΔE 0.069
- Cobalt #1E488F ΔE 0.072
Use #1F366E 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.