#1F355A
Closest named color: Prussian Blue (#1D3557). oklch(33.1% 0.072 260.2), rgb(31, 53, 90).
Aa
White text reads best on this color (12.24:1).
About this color
#1F355A is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.072 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.006 away. White text reads best on it, at 12.24:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.71:1 |
| White text | 12.24:1 |
Values
| HEX | #1F355A |
| RGB | rgb(31, 53, 90) |
| HSL | hsl(218, 49%, 24%) |
| OKLCH | oklch(33.1% 0.072 260.2) |
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 #1F355A | 12.24:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #1F355A | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #1F355A text on white | 12.24:1 | AAA | Lc 97.8 | Preferred for body text |
| #1F355A text on black | 1.71:1 | 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
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ADC2E4
oklch(81% 0.053 260)
-
Step 400
400
#81A2D6
oklch(70.7% 0.085 259.3)
-
Step 500
500
#6289CC
oklch(63% 0.111 260.8)
-
Step 600
600
#4972B9
oklch(55.6% 0.12 260.7)
-
Step 700
700
#3A609F
oklch(49.2% 0.11 260)
-
Step 800
800
#304E81
oklch(42.6% 0.092 260.4)
-
Step 900
900 (this color)
#1F355A
oklch(33.1% 0.072 260.2)
-
Step 950
950
#19263D
oklch(26.9% 0.047 261.3)
#1F355A 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) | #25385B | 0.013 |
| Deuteranopia (no green cones) | #1D3359 | 0.007 |
| Tritanopia (no blue cones) | #003D43 | 0.060 |
| Achromatopsia (no color) | #353535 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F355A
#1F355A
oklch(33.1% 0.072 260.2)
- #483100
#483100
oklch(33.2% 0.069 80)
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 #1F355A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.006
- Marine Blue #01386A ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.034
- Marine #042E60 ΔE 0.037
- Midnight Green #073B4C ΔE 0.040
- Gunmetal #293241 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.058
Use #1F355A 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.