#2F3380
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.128 275.8), rgb(47, 51, 128).
Aa
White text reads best on this color (11.01:1).
About this color
#2F3380 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.128 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.053 away. White text reads best on it, at 11.01:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.01:1 |
Values
| HEX | #2F3380 |
| RGB | rgb(47, 51, 128) |
| HSL | hsl(237, 46%, 34%) |
| OKLCH | oklch(36.6% 0.128 275.8) |
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 #2F3380 | 11.01:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #2F3380 | 1.90:1 | Fails | Lc 8.8 | Not readable |
| #2F3380 text on white | 11.01:1 | AAA | Lc 95.1 | Preferred for body text |
| #2F3380 text on black | 1.90:1 | Fails | Lc -7.5 | 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
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CFD7FD
oklch(88.5% 0.053 275.9)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8796FF
oklch(70.7% 0.154 275.6)
-
Step 500
500
#6D77FD
oklch(63.1% 0.196 276)
-
Step 600
600
#585BEC
oklch(55.6% 0.213 276)
-
Step 700
700
#484ACD
oklch(49.1% 0.197 275.7)
-
Step 800
800
#3B3EA6
oklch(42.8% 0.164 275.7)
-
Step 900
900 (this color)
#2F3380
oklch(36.6% 0.128 275.8)
-
Step 950
950
#1D214D
oklch(27.1% 0.08 275.8)
#2F3380 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) | #004083 | 0.047 |
| Deuteranopia (no green cones) | #00397E | 0.042 |
| Tritanopia (no blue cones) | #004654 | 0.110 |
| Achromatopsia (no color) | #3C3C3C | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3380
#2F3380
oklch(36.6% 0.128 275.8)
- #4B3E00
#4B3E00
oklch(36.7% 0.075 95.6)
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 #2F3380, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.053
- Cobalt #1E488F ΔE 0.059
- Marine Blue #01386A ΔE 0.059
- Blueberry #464196 ΔE 0.064
- Sapphire #2138AB ΔE 0.073
- Marine #042E60 ΔE 0.076
- Prussian Blue #1D3557 ΔE 0.077
Use #2F3380 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.