#1F3A6F
Closest named color: Marine Blue (#01386A). oklch(35.8% 0.098 262.3), rgb(31, 58, 111).
Aa
White text reads best on this color (11.09:1).
About this color
#1F3A6F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.098 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.026 away. White text reads best on it, at 11.09:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #1F3A6F |
| RGB | rgb(31, 58, 111) |
| HSL | hsl(220, 56%, 28%) |
| OKLCH | oklch(35.8% 0.098 262.3) |
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 #1F3A6F | 11.09:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #1F3A6F | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #1F3A6F text on white | 11.09:1 | AAA | Lc 95.4 | Preferred for body text |
| #1F3A6F text on black | 1.89:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A7C1F1
oklch(80.8% 0.074 262.5)
-
Step 400
400
#78A0EA
oklch(70.7% 0.118 262.1)
-
Step 500
500
#5686E3
oklch(63% 0.15 262.3)
-
Step 600
600
#3C6ED1
oklch(55.6% 0.162 262.3)
-
Step 700
700
#2E5BB5
oklch(49% 0.151 262.3)
-
Step 800
800
#274B93
oklch(42.7% 0.126 262.4)
-
Step 900
900 (this color)
#1F3A6F
oklch(35.8% 0.098 262.3)
-
Step 950
950
#152544
oklch(26.8% 0.062 262.4)
#1F3A6F 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) | #1F4071 | 0.018 |
| Deuteranopia (no green cones) | #10386E | 0.016 |
| Tritanopia (no blue cones) | #00464F | 0.078 |
| Achromatopsia (no color) | #3C3C3C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3A6F
#1F3A6F
oklch(35.8% 0.098 262.3)
- #4F3800
#4F3800
oklch(35.7% 0.073 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 #1F3A6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.026
- Twilight Blue #0A437A ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.043
- Marine #042E60 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.061
- Cobalt #1E488F ΔE 0.063
- Midnight Green #073B4C ΔE 0.068
Use #1F3A6F 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.