#2F3370
Closest named color: Marine Blue (#01386A). oklch(35.3% 0.104 276.9), rgb(47, 51, 112).
Aa
White text reads best on this color (11.48:1).
About this color
#2F3370 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.104 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.046 away. White text reads best on it, at 11.48:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.82:1 |
| White text | 11.48:1 |
Values
| HEX | #2F3370 |
| RGB | rgb(47, 51, 112) |
| HSL | hsl(236, 41%, 31%) |
| OKLCH | oklch(35.3% 0.104 276.9) |
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 #2F3370 | 11.48:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #2F3370 | 1.82:1 | Fails | Lc 7.7 | Not readable |
| #2F3370 text on white | 11.48:1 | AAA | Lc 96.2 | Preferred for body text |
| #2F3370 text on black | 1.82:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D1D7F6
oklch(88.4% 0.043 276.8)
-
Step 300
300
#B3BDF3
oklch(80.9% 0.077 276.4)
-
Step 400
400
#8D98ED
oklch(70.6% 0.125 277.1)
-
Step 500
500
#737DE7
oklch(63.2% 0.158 276.8)
-
Step 600
600
#5D63D6
oklch(55.6% 0.173 276.9)
-
Step 700
700
#4D51B9
oklch(49% 0.161 277)
-
Step 800
800
#3F4396
oklch(42.7% 0.134 277)
-
Step 900
900 (this color)
#2F3370
oklch(35.3% 0.104 276.9)
-
Step 950
950
#1F2246
oklch(27% 0.066 277.4)
#2F3370 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) | #123C72 | 0.037 |
| Deuteranopia (no green cones) | #07376F | 0.040 |
| Tritanopia (no blue cones) | #0D414C | 0.091 |
| Achromatopsia (no color) | #393939 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3370
#2F3370
oklch(35.3% 0.104 276.9)
- #463B00
#463B00
oklch(35.3% 0.073 97.4)
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 #2F3370, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.053
- Marine #042E60 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.067
- Cobalt #1E488F ΔE 0.073
- Dark Blue Grey #1F3B4D ΔE 0.075
- Dark Grey Blue #29465B ΔE 0.075
Use #2F3370 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.