#2F387E
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.118 273.8), rgb(47, 56, 126).
Aa
White text reads best on this color (10.56:1).
About this color
#2F387E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.118 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 10.56:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.56:1 |
Values
| HEX | #2F387E |
| RGB | rgb(47, 56, 126) |
| HSL | hsl(233, 46%, 34%) |
| OKLCH | oklch(37.4% 0.118 273.8) |
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 #2F387E | 10.56:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #2F387E | 1.98:1 | Fails | Lc 9.7 | Not readable |
| #2F387E text on white | 10.56:1 | AAA | Lc 94.2 | Preferred for body text |
| #2F387E text on black | 1.98:1 | Fails | Lc -8.3 | 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
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#AEBDFA
oklch(80.9% 0.088 273.6)
-
Step 400
400
#8598F8
oklch(70.6% 0.142 273.8)
-
Step 500
500
#6A7BF5
oklch(63.1% 0.181 274)
-
Step 600
600
#5461E3
oklch(55.6% 0.195 273.9)
-
Step 700
700
#454FC6
oklch(49.2% 0.183 273.9)
-
Step 800
800
#3842A0
oklch(42.8% 0.151 273.6)
-
Step 900
900 (this color)
#2F387E
oklch(37.4% 0.118 273.8)
-
Step 950
950
#1C224A
oklch(27% 0.074 274)
#2F387E 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) | #0B4280 | 0.039 |
| Deuteranopia (no green cones) | #003B7D | 0.040 |
| Tritanopia (no blue cones) | #004855 | 0.101 |
| Achromatopsia (no color) | #3F3F3F | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F387E
#2F387E
oklch(37.4% 0.118 273.8)
- #4E3F00
#4E3F00
oklch(37.3% 0.076 93.6)
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 #2F387E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.048
- Cobalt #1E488F ΔE 0.050
- Marine Blue #01386A ΔE 0.056
- Blueberry #464196 ΔE 0.059
- Light Navy #155084 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.073
- Sapphire #2138AB ΔE 0.076
Use #2F387E 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.