#2F3780
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.122 274.2), rgb(47, 55, 128).
Aa
White text reads best on this color (10.61:1).
About this color
#2F3780 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.122 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.045 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #2F3780 |
| RGB | rgb(47, 55, 128) |
| HSL | hsl(234, 46%, 34%) |
| OKLCH | oklch(37.4% 0.122 274.2) |
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 #2F3780 | 10.61:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #2F3780 | 1.97:1 | Fails | Lc 9.6 | Not readable |
| #2F3780 text on white | 10.61:1 | AAA | Lc 94.3 | Preferred for body text |
| #2F3780 text on black | 1.97:1 | 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
#CED7FC
oklch(88.4% 0.052 274.5)
-
Step 300
300
#AEBDFC
oklch(81% 0.091 273.9)
-
Step 400
400
#8598FB
oklch(70.8% 0.146 273.9)
-
Step 500
500
#6A7AF8
oklch(63.1% 0.187 274.3)
-
Step 600
600
#545FE7
oklch(55.6% 0.203 274.2)
-
Step 700
700
#454DC9
oklch(49.1% 0.189 274.2)
-
Step 800
800
#3840A3
oklch(42.7% 0.158 274.1)
-
Step 900
900 (this color)
#2F3780
oklch(37.4% 0.122 274.2)
-
Step 950
950
#1C214B
oklch(26.9% 0.077 274.9)
#2F3780 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) | #014283 | 0.043 |
| Deuteranopia (no green cones) | #003B7F | 0.040 |
| Tritanopia (no blue cones) | #004856 | 0.104 |
| Achromatopsia (no color) | #3F3F3F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3780
#2F3780
oklch(37.4% 0.122 274.2)
- #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 #2F3780, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.048
- Cobalt #1E488F ΔE 0.050
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.058
- Light Navy #155084 ΔE 0.070
- Sapphire #2138AB ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.076
Use #2F3780 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.