#1F305F
Closest named color: Prussian Blue (#1D3557). oklch(32.2% 0.086 266.6), rgb(31, 48, 95).
Aa
White text reads best on this color (12.75:1).
About this color
#1F305F is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.086 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.023 away. White text reads best on it, at 12.75:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.64:1 |
| White text | 12.75:1 |
Values
| HEX | #1F305F |
| RGB | rgb(31, 48, 95) |
| HSL | hsl(224, 51%, 25%) |
| OKLCH | oklch(32.2% 0.086 266.6) |
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 #1F305F | 12.75:1 | AAA | Lc -102.0 | Preferred for body text |
| Black text on #1F305F | 1.64:1 | Fails | Lc 0.0 | Not readable |
| #1F305F text on white | 12.75:1 | AAA | Lc 98.6 | Preferred for body text |
| #1F305F text on black | 1.64:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#537EFF
oklch(63.1% 0.197 266.8)
-
Step 600
600
#3760F5
oklch(55.5% 0.227 266.7)
-
Step 700
700
#2B4ED6
oklch(49.1% 0.212 266.7)
-
Step 800
800
#2341AD
oklch(42.6% 0.176 266.6)
-
Step 900
900
#203989
oklch(37.7% 0.137 266.5)
-
Step 950
950 (this color)
#1F305F
oklch(32.2% 0.086 266.6)
#1F305F 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) | #193561 | 0.015 |
| Deuteranopia (no green cones) | #0E305E | 0.018 |
| Tritanopia (no blue cones) | #003B42 | 0.075 |
| Achromatopsia (no color) | #323232 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F305F
#1F305F
oklch(32.2% 0.086 266.6)
- #423000
#423000
oklch(32.1% 0.066 85.8)
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 #1F305F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.023
- Marine #042E60 ΔE 0.026
- Marine Blue #01386A ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.053
- Midnight Green #073B4C ΔE 0.057
- Gunmetal #293241 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.067
Use #1F305F 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.