#1F3155
Closest named color: Prussian Blue (#1D3557). oklch(31.7% 0.069 263), rgb(31, 49, 85).
Aa
White text reads best on this color (12.89:1).
About this color
#1F3155 is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.069 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.012 away. White text reads best on it, at 12.89:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.62:1 |
| White text | 12.89:1 |
Values
| HEX | #1F3155 |
| RGB | rgb(31, 49, 85) |
| HSL | hsl(220, 47%, 23%) |
| OKLCH | oklch(31.7% 0.069 263) |
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 #1F3155 | 12.89:1 | AAA | Lc -102.2 | Preferred for body text |
| Black text on #1F3155 | 1.62:1 | Fails | Lc 0.0 | Not readable |
| #1F3155 text on white | 12.89:1 | AAA | Lc 98.9 | Preferred for body text |
| #1F3155 text on black | 1.62:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF8
oklch(88.6% 0.045 263.1)
-
Step 300
300
#A5C1F6
oklch(80.9% 0.081 263)
-
Step 400
400
#759FF2
oklch(70.7% 0.131 263.1)
-
Step 500
500
#5184ED
oklch(63% 0.167 263)
-
Step 600
600
#376BDB
oklch(55.5% 0.181 263.1)
-
Step 700
700
#2959BE
oklch(49.1% 0.168 262.7)
-
Step 800
800
#23499A
oklch(42.7% 0.14 263)
-
Step 900
900
#213E7A
oklch(37.6% 0.108 262.9)
-
Step 950
950 (this color)
#1F3155
oklch(31.7% 0.069 263)
#1F3155 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) | #223456 | 0.011 |
| Deuteranopia (no green cones) | #1B2F54 | 0.009 |
| Tritanopia (no blue cones) | #00393E | 0.061 |
| Achromatopsia (no color) | #323232 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3155
#1F3155
oklch(31.7% 0.069 263)
- #422E00
#422E00
oklch(31.6% 0.065 82.4)
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 #1F3155, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.012
- Marine #042E60 ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.039
- Gunmetal #293241 ΔE 0.039
- Marine Blue #01386A ΔE 0.042
- Midnight Green #073B4C ΔE 0.043
- Oxford Blue #1B263B ΔE 0.055
Use #1F3155 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.