#1F3D64
Closest named color: Marine Blue (#01386A). oklch(35.8% 0.077 255.8), rgb(31, 61, 100).
Aa
White text reads best on this color (10.99:1).
About this color
#1F3D64 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.077 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.031 away. White text reads best on it, at 10.99:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 10.99:1 |
Values
| HEX | #1F3D64 |
| RGB | rgb(31, 61, 100) |
| HSL | hsl(214, 53%, 26%) |
| OKLCH | oklch(35.8% 0.077 255.8) |
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 #1F3D64 | 10.99:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #1F3D64 | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #1F3D64 text on white | 10.99:1 | AAA | Lc 95.3 | Preferred for body text |
| #1F3D64 text on black | 1.90:1 | Fails | Lc -7.4 | 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
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CCDBEF
oklch(88.6% 0.032 255.6)
-
Step 300
300
#A8C3E6
oklch(80.9% 0.058 255)
-
Step 400
400
#7AA3DA
oklch(70.7% 0.093 256)
-
Step 500
500
#578BD0
oklch(63.1% 0.119 256)
-
Step 600
600
#3B74BD
oklch(55.6% 0.129 255.7)
-
Step 700
700
#2D61A3
oklch(49.1% 0.12 255.7)
-
Step 800
800
#274F84
oklch(42.6% 0.099 256.3)
-
Step 900
900 (this color)
#1F3D64
oklch(35.8% 0.077 255.8)
-
Step 950
950
#16273E
oklch(27% 0.049 256.3)
#1F3D64 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) | #2C4066 | 0.019 |
| Deuteranopia (no green cones) | #223963 | 0.012 |
| Tritanopia (no blue cones) | #00464B | 0.063 |
| Achromatopsia (no color) | #3C3C3C | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3D64
#1F3D64
oklch(35.8% 0.077 255.8)
- #533600
#533600
oklch(35.8% 0.075 75.7)
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 #1F3D64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.039
- Twilight Blue #0A437A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.040
- Charcoal #264653 ΔE 0.048
- Midnight Green #073B4C ΔE 0.048
- Marine #042E60 ΔE 0.055
Use #1F3D64 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.