#1F345E
Closest named color: Prussian Blue (#1D3557). oklch(33.1% 0.079 262.8), rgb(31, 52, 94).
Aa
White text reads best on this color (12.27:1).
About this color
#1F345E is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.079 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.014 away. White text reads best on it, at 12.27:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.71:1 |
| White text | 12.27:1 |
Values
| HEX | #1F345E |
| RGB | rgb(31, 52, 94) |
| HSL | hsl(220, 50%, 25%) |
| OKLCH | oklch(33.1% 0.079 262.8) |
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 #1F345E | 12.27:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #1F345E | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #1F345E text on white | 12.27:1 | AAA | Lc 97.8 | Preferred for body text |
| #1F345E text on black | 1.71:1 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF0
oklch(88.6% 0.033 262.7)
-
Step 300
300
#ACC1E8
oklch(80.8% 0.06 262.8)
-
Step 400
400
#81A0DC
oklch(70.6% 0.095 263.1)
-
Step 500
500
#6188D3
oklch(63.1% 0.122 262.6)
-
Step 600
600
#4870C0
oklch(55.5% 0.133 262.8)
-
Step 700
700
#3A5EA6
oklch(49.2% 0.123 262.7)
-
Step 800
800
#304D86
oklch(42.7% 0.101 262.6)
-
Step 900
900 (this color)
#1F345E
oklch(33.1% 0.079 262.8)
-
Step 950
950
#19263F
oklch(27% 0.05 262.6)
#1F345E 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) | #213860 | 0.013 |
| Deuteranopia (no green cones) | #18325D | 0.011 |
| Tritanopia (no blue cones) | #003D44 | 0.066 |
| Achromatopsia (no color) | #353535 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F345E
#1F345E
oklch(33.1% 0.079 262.8)
- #473200
#473200
oklch(33.3% 0.068 82.8)
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 #1F345E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.014
- Marine Blue #01386A ΔE 0.029
- Marine #042E60 ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.042
- Midnight Green #073B4C ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.051
- Gunmetal #293241 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.060
Use #1F345E 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.