#1F2F57
Closest named color: Prussian Blue (#1D3557). oklch(31.4% 0.075 265.8), rgb(31, 47, 87).
Aa
White text reads best on this color (13.10:1).
About this color
#1F2F57 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.075 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 13.10:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.60:1 |
| White text | 13.10:1 |
Values
| HEX | #1F2F57 |
| RGB | rgb(31, 47, 87) |
| HSL | hsl(223, 47%, 23%) |
| OKLCH | oklch(31.4% 0.075 265.8) |
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 #1F2F57 | 13.10:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #1F2F57 | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #1F2F57 text on white | 13.10:1 | AAA | Lc 99.2 | Preferred for body text |
| #1F2F57 text on black | 1.60:1 | 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
#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
#A6C0FB
oklch(81% 0.089 266)
-
Step 400
400
#769DF9
oklch(70.7% 0.142 265.5)
-
Step 500
500
#5581F6
oklch(63.2% 0.181 265.9)
-
Step 600
600
#3C67E5
oklch(55.7% 0.197 265.9)
-
Step 700
700
#2F54C7
oklch(49.1% 0.184 266.1)
-
Step 800
800
#2746A1
oklch(42.8% 0.152 265.9)
-
Step 900
900
#233C7F
oklch(37.7% 0.118 265.6)
-
Step 950
950 (this color)
#1F2F57
oklch(31.4% 0.075 265.8)
#1F2F57 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) | #1D3359 | 0.012 |
| Deuteranopia (no green cones) | #162E56 | 0.012 |
| Tritanopia (no blue cones) | #00383E | 0.066 |
| Achromatopsia (no color) | #303030 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2F57
#1F2F57
oklch(31.4% 0.075 265.8)
- #402E00
#402E00
oklch(31.4% 0.064 85)
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 #1F2F57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Marine #042E60 ΔE 0.029
- Space Cadet #2B2D42 ΔE 0.040
- Marine Blue #01386A ΔE 0.042
- Gunmetal #293241 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.047
- Midnight Green #073B4C ΔE 0.051
- Oxford Blue #1B263B ΔE 0.055
Use #1F2F57 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.