#1F2553
Closest named color: Marine (#042E60). oklch(28.7% 0.083 274.3), rgb(31, 37, 83).
Aa
White text reads best on this color (14.50:1).
About this color
#1F2553 is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.083 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 14.50:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.44:1 |
| White text | 14.50:1 |
Values
| HEX | #1F2553 |
| RGB | rgb(31, 37, 83) |
| HSL | hsl(233, 46%, 22%) |
| OKLCH | oklch(28.7% 0.083 274.3) |
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 #1F2553 | 14.50:1 | AAA | Lc -104.0 | Preferred for body text |
| Black text on #1F2553 | 1.44:1 | Fails | Lc 0.0 | Not readable |
| #1F2553 text on white | 14.50:1 | AAA | Lc 101.1 | Preferred for body text |
| #1F2553 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E4E9FE
oklch(93.7% 0.029 275.2)
-
Step 200
200
#CED7FE
oklch(88.5% 0.055 275)
-
Step 300
300
#ADBCFF
oklch(80.8% 0.096 274.3)
-
Step 400
400
#8497FF
oklch(70.7% 0.153 274)
-
Step 500
500
#6978FF
oklch(63.1% 0.199 274.4)
-
Step 600
600
#535BF0
oklch(55.6% 0.22 274.3)
-
Step 700
700
#444AD1
oklch(49.2% 0.203 274.1)
-
Step 800
800
#383EA9
oklch(42.8% 0.168 274.3)
-
Step 900
900
#2F3686
oklch(37.7% 0.132 274.4)
-
Step 950
950 (this color)
#1F2553
oklch(28.7% 0.083 274.3)
#1F2553 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) | #0C2C55 | 0.027 |
| Deuteranopia (no green cones) | #042752 | 0.029 |
| Tritanopia (no blue cones) | #012F38 | 0.072 |
| Achromatopsia (no color) | #292929 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2553
#1F2553
oklch(28.7% 0.083 274.3)
- #342A00
#342A00
oklch(28.8% 0.059 95)
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 #1F2553, 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 0.046
- Prussian Blue #1D3557 ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.049
- Midnight Blue #191970 ΔE 0.061
- Gunmetal #293241 ΔE 0.062
- Dark #1B2431 ΔE 0.064
- Dark Indigo #1F0954 ΔE 0.065
Use #1F2553 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.