#1F235C
Closest named color: Marine (#042E60). oklch(29% 0.1 275.2), rgb(31, 35, 92).
Aa
White text reads best on this color (14.45:1).
About this color
#1F235C is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.100 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.037 away. White text reads best on it, at 14.45:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.45:1 |
| White text | 14.45:1 |
Values
| HEX | #1F235C |
| RGB | rgb(31, 35, 92) |
| HSL | hsl(236, 50%, 24%) |
| OKLCH | oklch(29% 0.1 275.2) |
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 #1F235C | 14.45:1 | AAA | Lc -103.9 | Preferred for body text |
| Black text on #1F235C | 1.45:1 | Fails | Lc 0.0 | Not readable |
| #1F235C text on white | 14.45:1 | AAA | Lc 101.0 | Preferred for body text |
| #1F235C text on black | 1.45:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8696FF
oklch(70.7% 0.154 275.2)
-
Step 500
500
#6B77FF
oklch(63.1% 0.199 275.3)
-
Step 600
600
#5453FF
oklch(55.7% 0.246 275.1)
-
Step 700
700
#463BE7
oklch(49.2% 0.245 275.3)
-
Step 800
800
#3833BB
oklch(42.7% 0.204 275.1)
-
Step 900
900
#2F3093
oklch(37.7% 0.158 275.3)
-
Step 950
950 (this color)
#1F235C
oklch(29% 0.1 275.2)
#1F235C 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) | #002C5E | 0.035 |
| Deuteranopia (no green cones) | #00275B | 0.032 |
| Tritanopia (no blue cones) | #00313B | 0.086 |
| Achromatopsia (no color) | #2A2A2A | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F235C
#1F235C
oklch(29% 0.1 275.2)
- #352B00
#352B00
oklch(29.2% 0.06 95.3)
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 #1F235C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.037
- Midnight Blue #191970 ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.059
- Oxford Blue #1B263B ΔE 0.063
- Marine Blue #01386A ΔE 0.063
- Space Cadet #2B2D42 ΔE 0.064
- Darkblue #030764 ΔE 0.076
Use #1F235C 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.