#2F306B
Closest named color: Marine Blue (#01386A). oklch(34.3% 0.1 279), rgb(47, 48, 107).
Aa
White text reads best on this color (11.95:1).
About this color
#2F306B is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.100 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.047 away. White text reads best on it, at 11.95:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.75:1 |
| White text | 11.95:1 |
Values
| HEX | #2F306B |
| RGB | rgb(47, 48, 107) |
| HSL | hsl(239, 39%, 30%) |
| OKLCH | oklch(34.3% 0.1 279) |
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 #2F306B | 11.95:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #2F306B | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #2F306B text on white | 11.95:1 | AAA | Lc 97.2 | Preferred for body text |
| #2F306B 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D3D7F5
oklch(88.5% 0.041 279.5)
-
Step 300
300
#B5BCF1
oklch(80.8% 0.075 278.7)
-
Step 400
400
#9198EA
oklch(70.7% 0.12 279.1)
-
Step 500
500
#777CE4
oklch(63.1% 0.154 278.9)
-
Step 600
600
#6163D2
oklch(55.6% 0.167 278.7)
-
Step 700
700
#5151B6
oklch(49.1% 0.156 279)
-
Step 800
800
#424393
oklch(42.7% 0.129 278.9)
-
Step 900
900 (this color)
#2F306B
oklch(34.3% 0.1 279)
-
Step 950
950
#202245
oklch(27% 0.064 278.7)
#2F306B 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) | #10396D | 0.040 |
| Deuteranopia (no green cones) | #08346A | 0.042 |
| Tritanopia (no blue cones) | #143D48 | 0.087 |
| Achromatopsia (no color) | #373737 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F306B
#2F306B
oklch(34.3% 0.1 279)
- #423900
#423900
oklch(34.4% 0.071 99.4)
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 #2F306B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.047
- Marine #042E60 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.061
- Midnight Blue #191970 ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.072
- Space Cadet #2B2D42 ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.077
Use #2F306B 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.