#1F2552
Closest named color: Marine (#042E60). oklch(28.6% 0.082 274.4), rgb(31, 37, 82).
Aa
White text reads best on this color (14.53:1).
About this color
#1F2552 is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.082 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.039 away. White text reads best on it, at 14.53:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.44:1 |
| White text | 14.53:1 |
Values
| HEX | #1F2552 |
| RGB | rgb(31, 37, 82) |
| HSL | hsl(233, 45%, 22%) |
| OKLCH | oklch(28.6% 0.082 274.4) |
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 #1F2552 | 14.53:1 | AAA | Lc -104.1 | Preferred for body text |
| Black text on #1F2552 | 1.44:1 | Fails | Lc 0.0 | Not readable |
| #1F2552 text on white | 14.53:1 | AAA | Lc 101.2 | Preferred for body text |
| #1F2552 text on black | 1.44:1 | 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 950.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CED7FD
oklch(88.4% 0.053 274.8)
-
Step 300
300
#ADBCFF
oklch(80.8% 0.096 274.3)
-
Step 400
400
#8497FF
oklch(70.7% 0.153 274)
-
Step 500
500
#6978FE
oklch(63.1% 0.197 274.5)
-
Step 600
600
#535CED
oklch(55.5% 0.215 274.3)
-
Step 700
700
#454BCF
oklch(49.2% 0.2 274.3)
-
Step 800
800
#383EA7
oklch(42.6% 0.166 274.4)
-
Step 900
900
#2F3784
oklch(37.7% 0.128 274)
-
Step 950
950 (this color)
#1F2552
oklch(28.6% 0.082 274.4)
#1F2552 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) | #0E2B54 | 0.025 |
| Deuteranopia (no green cones) | #062751 | 0.028 |
| Tritanopia (no blue cones) | #022F37 | 0.072 |
| Achromatopsia (no color) | #292929 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2552
#1F2552
oklch(28.6% 0.082 274.4)
- #342900
#342900
oklch(28.5% 0.058 93.2)
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 #1F2552, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.039
- Oxford Blue #1B263B ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.049
- Gunmetal #293241 ΔE 0.061
- Midnight Blue #191970 ΔE 0.062
- Dark #1B2431 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.065
Use #1F2552 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.