#2F3D71
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.091 270.2), rgb(47, 61, 113).
Aa
White text reads best on this color (10.36:1).
About this color
#2F3D71 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.091 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.36:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.02:1 |
| White text | 10.36:1 |
Values
| HEX | #2F3D71 |
| RGB | rgb(47, 61, 113) |
| HSL | hsl(227, 41%, 31%) |
| OKLCH | oklch(37.6% 0.091 270.2) |
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 #2F3D71 | 10.36:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #2F3D71 | 2.02:1 | Fails | Lc 10.0 | Not readable |
| #2F3D71 text on white | 10.36:1 | AAA | Lc 93.9 | Preferred for body text |
| #2F3D71 text on black | 2.02:1 | Fails | Lc -8.6 | 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
#E5EAF8
oklch(93.7% 0.02 270.2)
-
Step 200
200
#CFD9F3
oklch(88.6% 0.037 268.9)
-
Step 300
300
#AFBFEE
oklch(80.9% 0.069 270.1)
-
Step 400
400
#869DE5
oklch(70.7% 0.109 269.9)
-
Step 500
500
#6983DD
oklch(63.1% 0.139 269.9)
-
Step 600
600
#526ACB
oklch(55.5% 0.152 270.3)
-
Step 700
700
#4358AF
oklch(49% 0.14 270.3)
-
Step 800
800
#37498E
oklch(42.8% 0.116 269.9)
-
Step 900
900 (this color)
#2F3D71
oklch(37.6% 0.091 270.2)
-
Step 950
950
#1C2442
oklch(26.9% 0.057 270.9)
#2F3D71 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) | #264373 | 0.019 |
| Deuteranopia (no green cones) | #1E3D70 | 0.020 |
| Tritanopia (no blue cones) | #094851 | 0.081 |
| Achromatopsia (no color) | #404040 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3D71
#2F3D71
oklch(37.6% 0.091 270.2)
- #513F00
#513F00
oklch(37.6% 0.077 90.4)
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 #2F3D71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Marine Blue #01386A ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.053
- Cobalt #1E488F ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.059
- Light Navy #155084 ΔE 0.060
- Charcoal #264653 ΔE 0.067
Use #2F3D71 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.