#1F3478
Closest named color: Marine Blue (#01386A). oklch(35.1% 0.119 267.1), rgb(31, 52, 120).
Aa
White text reads best on this color (11.53:1).
About this color
#1F3478 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.119 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.035 away. White text reads best on it, at 11.53:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.82:1 |
| White text | 11.53:1 |
Values
| HEX | #1F3478 |
| RGB | rgb(31, 52, 120) |
| HSL | hsl(226, 59%, 30%) |
| OKLCH | oklch(35.1% 0.119 267.1) |
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 #1F3478 | 11.53:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #1F3478 | 1.82:1 | Fails | Lc 7.7 | Not readable |
| #1F3478 text on white | 11.53:1 | AAA | Lc 96.2 | Preferred for body text |
| #1F3478 text on black | 1.82:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A7BFFB
oklch(80.8% 0.089 267.5)
-
Step 400
400
#789CFA
oklch(70.7% 0.144 266.9)
-
Step 500
500
#5880F7
oklch(63.2% 0.183 267.1)
-
Step 600
600
#3F66E6
oklch(55.7% 0.199 266.9)
-
Step 700
700
#3253C8
oklch(49.1% 0.186 267.1)
-
Step 800
800
#2A45A1
oklch(42.7% 0.153 267.2)
-
Step 900
900 (this color)
#1F3478
oklch(35.1% 0.119 267.1)
-
Step 950
950
#16234B
oklch(26.9% 0.076 267.6)
#1F3478 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) | #003D7A | 0.029 |
| Deuteranopia (no green cones) | #003577 | 0.023 |
| Tritanopia (no blue cones) | #004450 | 0.096 |
| Achromatopsia (no color) | #393939 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3478
#1F3478
oklch(35.1% 0.119 267.1)
- #4B3800
#4B3800
oklch(35.2% 0.072 87.3)
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 #1F3478, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.035
- Twilight Blue #0A437A ΔE 0.042
- Marine #042E60 ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.059
- Cobalt #1E488F ΔE 0.065
- Midnight Blue #191970 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.075
- Royal #0C1793 ΔE 0.078
Use #1F3478 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.