#1F375E
Closest named color: Prussian Blue (#1D3557). oklch(33.8% 0.075 259.7), rgb(31, 55, 94).
Aa
White text reads best on this color (11.88:1).
About this color
#1F375E is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.075 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.013 away. White text reads best on it, at 11.88:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.88:1 |
Values
| HEX | #1F375E |
| RGB | rgb(31, 55, 94) |
| HSL | hsl(217, 50%, 25%) |
| OKLCH | oklch(33.8% 0.075 259.7) |
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 #1F375E | 11.88:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #1F375E | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #1F375E text on white | 11.88:1 | AAA | Lc 97.1 | Preferred for body text |
| #1F375E text on black | 1.76:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E6
oklch(80.9% 0.057 259.3)
-
Step 400
400
#7FA2D9
oklch(70.8% 0.09 259.2)
-
Step 500
500
#5F8ACF
oklch(63.2% 0.115 259.5)
-
Step 600
600
#4572BC
oklch(55.6% 0.126 259.8)
-
Step 700
700
#375FA2
oklch(49% 0.117 260.1)
-
Step 800
800
#2E4E83
oklch(42.7% 0.096 260)
-
Step 900
900 (this color)
#1F375E
oklch(33.8% 0.075 259.7)
-
Step 950
950
#18263E
oklch(26.9% 0.049 260.7)
#1F375E 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) | #263A60 | 0.014 |
| Deuteranopia (no green cones) | #1D345D | 0.010 |
| Tritanopia (no blue cones) | #004046 | 0.063 |
| Achromatopsia (no color) | #373737 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F375E
#1F375E
oklch(33.8% 0.075 259.7)
- #4A3300
#4A3300
oklch(33.9% 0.07 80.9)
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 #1F375E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.013
- Marine Blue #01386A ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.036
- Marine #042E60 ΔE 0.040
- Midnight Green #073B4C ΔE 0.043
- Gunmetal #293241 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.054
Use #1F375E 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.