#2F51A3
Closest named color: Dusk Blue (#26538D). oklch(45.6% 0.138 264.6), rgb(47, 81, 163).
Aa
White text reads best on this color (7.42:1).
About this color
#2F51A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.138 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.039 away. White text reads best on it, at 7.42:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.82:1 |
| White text | 7.42:1 |
Values
| HEX | #2F51A3 |
| RGB | rgb(47, 81, 163) |
| HSL | hsl(222, 55%, 41%) |
| OKLCH | oklch(45.6% 0.138 264.6) |
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 #2F51A3 | 7.42:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #2F51A3 | 2.82:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #2F51A3 text on white | 7.42:1 | AAA | Lc 85.5 | Fine for body text |
| #2F51A3 text on black | 2.82:1 | Fails | Lc -16.6 | Dividers and decoration only |
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 800.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CAD9F8
oklch(88.4% 0.046 264.9)
-
Step 300
300
#A7C0F6
oklch(80.8% 0.082 265.3)
-
Step 400
400
#789EF1
oklch(70.6% 0.129 264.6)
-
Step 500
500
#5683EC
oklch(63% 0.165 264.7)
-
Step 600
600
#3D6ADB
oklch(55.6% 0.18 264.8)
-
Step 700
700
#2F58BE
oklch(49.1% 0.167 264.5)
-
Step 800
800 (this color)
#2F51A3
oklch(45.6% 0.138 264.6)
-
Step 900
900
#243E7A
oklch(37.8% 0.107 264.3)
-
Step 950
950
#152548
oklch(27.1% 0.069 263.9)
#2F51A3 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) | #225BA6 | 0.027 |
| Deuteranopia (no green cones) | #0050A1 | 0.029 |
| Tritanopia (no blue cones) | #006472 | 0.111 |
| Achromatopsia (no color) | #555555 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F51A3
#2F51A3
oklch(45.6% 0.138 264.6)
- #6F5200
#6F5200
oklch(45.7% 0.094 84.9)
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 #2F51A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.039
- Cobalt #1E488F ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.045
- Blueberry #464196 ΔE 0.049
- Twilight #4E518B ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.055
- Light Navy #155084 ΔE 0.057
- Dusky Blue #475F94 ΔE 0.059
Use #2F51A3 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.