#1F356B
Closest named color: Marine Blue (#01386A). oklch(34.3% 0.098 265), rgb(31, 53, 107).
Aa
White text reads best on this color (11.79:1).
About this color
#1F356B is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.098 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.023 away. White text reads best on it, at 11.79:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.77:1 |
| White text | 11.79:1 |
Values
| HEX | #1F356B |
| RGB | rgb(31, 53, 107) |
| HSL | hsl(223, 55%, 27%) |
| OKLCH | oklch(34.3% 0.098 265) |
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 #1F356B | 11.79:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #1F356B | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #1F356B text on white | 11.79:1 | AAA | Lc 96.8 | Preferred for body text |
| #1F356B text on black | 1.77:1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#A9C0F1
oklch(80.8% 0.074 265.1)
-
Step 400
400
#7C9FEA
oklch(70.7% 0.117 264.5)
-
Step 500
500
#5C85E4
oklch(63.2% 0.15 264.9)
-
Step 600
600
#436CD2
oklch(55.6% 0.164 265)
-
Step 700
700
#355AB6
oklch(49.2% 0.152 264.9)
-
Step 800
800
#2C4A93
oklch(42.8% 0.125 264.8)
-
Step 900
900 (this color)
#1F356B
oklch(34.3% 0.098 265)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#1F356B 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) | #193B6D | 0.018 |
| Deuteranopia (no green cones) | #07346A | 0.021 |
| Tritanopia (no blue cones) | #00424A | 0.082 |
| Achromatopsia (no color) | #383838 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F356B
#1F356B
oklch(34.3% 0.098 265)
- #493500
#493500
oklch(34.2% 0.07 85.2)
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 #1F356B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.023
- Prussian Blue #1D3557 ΔE 0.036
- Marine #042E60 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.060
- Midnight Green #073B4C ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.073
Use #1F356B 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.