#1F375A
Closest named color: Prussian Blue (#1D3557). oklch(33.6% 0.069 257.8), rgb(31, 55, 90).
Aa
White text reads best on this color (11.98:1).
About this color
#1F375A is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.069 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.008 away. White text reads best on it, at 11.98:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.75:1 |
| White text | 11.98:1 |
Values
| HEX | #1F375A |
| RGB | rgb(31, 55, 90) |
| HSL | hsl(216, 49%, 24%) |
| OKLCH | oklch(33.6% 0.069 257.8) |
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 #1F375A | 11.98:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #1F375A | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #1F375A text on white | 11.98:1 | AAA | Lc 97.3 | Preferred for body text |
| #1F375A text on black | 1.75:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ACC2E3
oklch(80.8% 0.053 258.4)
-
Step 400
400
#80A2D4
oklch(70.6% 0.083 257.9)
-
Step 500
500
#608BC9
oklch(63.2% 0.105 257.5)
-
Step 600
600
#4674B6
oklch(55.7% 0.115 257.5)
-
Step 700
700
#38619C
oklch(49.2% 0.106 257.6)
-
Step 800
800
#2E4F7F
oklch(42.7% 0.089 257.8)
-
Step 900
900 (this color)
#1F375A
oklch(33.6% 0.069 257.8)
-
Step 950
950
#19273C
oklch(27.1% 0.044 258.3)
#1F375A 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) | #283A5B | 0.016 |
| Deuteranopia (no green cones) | #203459 | 0.009 |
| Tritanopia (no blue cones) | #003F44 | 0.058 |
| Achromatopsia (no color) | #373737 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F375A
#1F375A
oklch(33.6% 0.069 257.8)
- #4A3101
#4A3101
oklch(33.4% 0.069 77.3)
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 #1F375A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.008
- Dark Blue Grey #1F3B4D ΔE 0.030
- Marine Blue #01386A ΔE 0.034
- Midnight Green #073B4C ΔE 0.037
- Marine #042E60 ΔE 0.042
- Gunmetal #293241 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.052
Use #1F375A 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.