#1F2F71
Closest named color: Marine Blue (#01386A). oklch(33.4% 0.116 269), rgb(31, 47, 113).
Aa
White text reads best on this color (12.32:1).
About this color
#1F2F71 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.116 and its hue 269°. 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 12.32:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.70:1 |
| White text | 12.32:1 |
Values
| HEX | #1F2F71 |
| RGB | rgb(31, 47, 113) |
| HSL | hsl(228, 57%, 28%) |
| OKLCH | oklch(33.4% 0.116 269) |
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 #1F2F71 | 12.32:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #1F2F71 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #1F2F71 text on white | 12.32:1 | AAA | Lc 97.7 | Preferred for body text |
| #1F2F71 text on black | 1.70:1 | 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
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9FA
oklch(88.6% 0.048 268.4)
-
Step 300
300
#AABFFA
oklch(81% 0.087 269.2)
-
Step 400
400
#7D9BF7
oklch(70.6% 0.139 269)
-
Step 500
500
#5E7FF3
oklch(63% 0.177 268.9)
-
Step 600
600
#4765E2
oklch(55.6% 0.193 269)
-
Step 700
700
#3953C4
oklch(49.1% 0.179 269)
-
Step 800
800
#2F459F
oklch(42.8% 0.148 268.9)
-
Step 900
900 (this color)
#1F2F71
oklch(33.4% 0.116 269)
-
Step 950
950
#18234A
oklch(27% 0.074 269.2)
#1F2F71 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) | #003973 | 0.032 |
| Deuteranopia (no green cones) | #003170 | 0.025 |
| Tritanopia (no blue cones) | #003F4B | 0.093 |
| Achromatopsia (no color) | #353535 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2F71
#1F2F71
oklch(33.4% 0.116 269)
- #453400
#453400
oklch(33.5% 0.068 88.4)
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 #1F2F71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.035
- Marine #042E60 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.052
- Midnight Blue #191970 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.057
- Royal #0C1793 ΔE 0.078
- Dark Blue Grey #1F3B4D ΔE 0.079
- Cobalt #1E488F ΔE 0.083
Use #1F2F71 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.