#1F3B68
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.086 259.5), rgb(31, 59, 104).
Aa
White text reads best on this color (11.14:1).
About this color
#1F3B68 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.086 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 11.14:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.88:1 |
| White text | 11.14:1 |
Values
| HEX | #1F3B68 |
| RGB | rgb(31, 59, 104) |
| HSL | hsl(217, 54%, 26%) |
| OKLCH | oklch(35.5% 0.086 259.5) |
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 #1F3B68 | 11.14:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #1F3B68 | 1.88:1 | Fails | Lc 8.4 | Not readable |
| #1F3B68 text on white | 11.14:1 | AAA | Lc 95.5 | Preferred for body text |
| #1F3B68 text on black | 1.88:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A8C2EB
oklch(80.9% 0.065 259.4)
-
Step 400
400
#7AA2E1
oklch(70.8% 0.103 259.2)
-
Step 500
500
#5889D8
oklch(63.1% 0.131 259.5)
-
Step 600
600
#3D71C5
oklch(55.5% 0.142 259.6)
-
Step 700
700
#2F5EAB
oklch(49% 0.134 259.8)
-
Step 800
800
#284D8A
oklch(42.6% 0.11 259.9)
-
Step 900
900 (this color)
#1F3B68
oklch(35.5% 0.086 259.5)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#1F3B68 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) | #263F6A | 0.016 |
| Deuteranopia (no green cones) | #1B3867 | 0.011 |
| Tritanopia (no blue cones) | #00454C | 0.069 |
| Achromatopsia (no color) | #3B3B3B | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3B68
#1F3B68
oklch(35.5% 0.086 259.5)
- #503700
#503700
oklch(35.6% 0.074 80.3)
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 #1F3B68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.048
- Marine #042E60 ΔE 0.051
- Midnight Green #073B4C ΔE 0.056
- Charcoal #264653 ΔE 0.058
Use #1F3B68 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.