#1F3151
Closest named color: Prussian Blue (#1D3557). oklch(31.5% 0.062 261.2), rgb(31, 49, 81).
Aa
White text reads best on this color (12.99:1).
About this color
#1F3151 is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.062 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.015 away. White text reads best on it, at 12.99:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.61:1 |
| White text | 12.99:1 |
Values
| HEX | #1F3151 |
| RGB | rgb(31, 49, 81) |
| HSL | hsl(218, 45%, 22%) |
| OKLCH | oklch(31.5% 0.062 261.2) |
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 #1F3151 | 12.99:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #1F3151 | 1.61:1 | Fails | Lc 0.0 | Not readable |
| #1F3151 text on white | 12.99:1 | AAA | Lc 99.1 | Preferred for body text |
| #1F3151 text on black | 1.61:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F1
oklch(81% 0.073 260.7)
-
Step 400
400
#76A0EA
oklch(70.6% 0.118 261.2)
-
Step 500
500
#5387E4
oklch(63.2% 0.151 261.1)
-
Step 600
600
#386ED2
oklch(55.5% 0.165 261.4)
-
Step 700
700
#2A5CB6
oklch(49.2% 0.153 261)
-
Step 800
800
#244B93
oklch(42.6% 0.127 261.4)
-
Step 900
900
#224075
oklch(37.8% 0.098 260.9)
-
Step 950
950 (this color)
#1F3151
oklch(31.5% 0.062 261.2)
#1F3151 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) | #243452 | 0.013 |
| Deuteranopia (no green cones) | #1E2F50 | 0.007 |
| Tritanopia (no blue cones) | #00383D | 0.056 |
| Achromatopsia (no color) | #313131 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3151
#1F3151
oklch(31.5% 0.062 261.2)
- #412E03
#412E03
oklch(31.5% 0.062 82.5)
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 #1F3151, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.015
- Space Cadet #2B2D42 ΔE 0.031
- Gunmetal #293241 ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.036
- Marine #042E60 ΔE 0.038
- Midnight Green #073B4C ΔE 0.040
- Marine Blue #01386A ΔE 0.048
- Oxford Blue #1B263B ΔE 0.050
Use #1F3151 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.