#2F347C
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.12 275.7), rgb(47, 52, 124).
Aa
White text reads best on this color (11.03:1).
About this color
#2F347C is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.120 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.050 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #2F347C |
| RGB | rgb(47, 52, 124) |
| HSL | hsl(236, 45%, 34%) |
| OKLCH | oklch(36.5% 0.12 275.7) |
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 #2F347C | 11.03:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #2F347C | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #2F347C text on white | 11.03:1 | AAA | Lc 95.2 | Preferred for body text |
| #2F347C text on black | 1.90:1 | Fails | Lc -7.4 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#B0BCFB
oklch(80.9% 0.09 275.9)
-
Step 400
400
#8897F9
oklch(70.7% 0.144 275.5)
-
Step 500
500
#6D79F6
oklch(63% 0.185 275.6)
-
Step 600
600
#585EE5
oklch(55.5% 0.201 275.8)
-
Step 700
700
#494DC7
oklch(49.1% 0.186 275.7)
-
Step 800
800
#3B40A1
oklch(42.7% 0.154 275.5)
-
Step 900
900 (this color)
#2F347C
oklch(36.5% 0.12 275.7)
-
Step 950
950
#1D214B
oklch(27% 0.077 275.9)
#2F347C 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) | #003F7E | 0.045 |
| Deuteranopia (no green cones) | #00397B | 0.042 |
| Tritanopia (no blue cones) | #004552 | 0.105 |
| Achromatopsia (no color) | #3C3C3C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F347C
#2F347C
oklch(36.5% 0.12 275.7)
- #4A3D00
#4A3D00
oklch(36.3% 0.075 95.4)
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 #2F347C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Marine Blue #01386A ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.055
- Cobalt #1E488F ΔE 0.060
- Blueberry #464196 ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.070
- Marine #042E60 ΔE 0.072
- Light Navy #155084 ΔE 0.078
Use #2F347C 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.