#2F3B73
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.097 271.9), rgb(47, 59, 115).
Aa
White text reads best on this color (10.53:1).
About this color
#2F3B73 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.097 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.53:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.53:1 |
Values
| HEX | #2F3B73 |
| RGB | rgb(47, 59, 115) |
| HSL | hsl(229, 42%, 32%) |
| OKLCH | oklch(37.3% 0.097 271.9) |
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 #2F3B73 | 10.53:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #2F3B73 | 1.99:1 | Fails | Lc 9.7 | Not readable |
| #2F3B73 text on white | 10.53:1 | AAA | Lc 94.3 | Preferred for body text |
| #2F3B73 text on black | 1.99:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#B0BEF0
oklch(80.8% 0.073 272.5)
-
Step 400
400
#879CE9
oklch(70.8% 0.115 271.6)
-
Step 500
500
#6B81E2
oklch(63.1% 0.148 271.9)
-
Step 600
600
#5468D0
oklch(55.6% 0.161 272)
-
Step 700
700
#4556B4
oklch(49.1% 0.149 272.1)
-
Step 800
800
#384792
oklch(42.7% 0.124 271.7)
-
Step 900
900 (this color)
#2F3B73
oklch(37.3% 0.097 271.9)
-
Step 950
950
#1C2444
oklch(27.1% 0.06 271.3)
#2F3B73 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) | #214275 | 0.024 |
| Deuteranopia (no green cones) | #183C72 | 0.026 |
| Tritanopia (no blue cones) | #064751 | 0.085 |
| Achromatopsia (no color) | #3F3F3F | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3B73
#2F3B73
oklch(37.3% 0.097 271.9)
- #4F3E00
#4F3E00
oklch(37.1% 0.076 91.2)
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 #2F3B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.047
- Cobalt #1E488F ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.060
- Light Navy #155084 ΔE 0.064
- Blueberry #464196 ΔE 0.070
Use #2F3B73 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.