#3F56D5
Closest named color: Warm Blue (#4B57DB). oklch(51.3% 0.196 270.1), rgb(63, 86, 213).
Aa
White text reads best on this color (5.99:1).
About this color
#3F56D5 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.196 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.018 away. White text reads best on it, at 5.99:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.50:1 |
| White text | 5.99:1 |
Values
| HEX | #3F56D5 |
| RGB | rgb(63, 86, 213) |
| HSL | hsl(231, 64%, 54%) |
| OKLCH | oklch(51.3% 0.196 270.1) |
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 #3F56D5 | 5.99:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #3F56D5 | 3.50:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #3F56D5 text on white | 5.99:1 | AA | Lc 79.4 | Fine for body text |
| #3F56D5 text on black | 3.50:1 | AA large text | Lc -22.4 | 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 700.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CBD8FD
oklch(88.4% 0.053 270)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5E7CFD
oklch(63.1% 0.194 270.1)
-
Step 600
600
#4761EC
oklch(55.6% 0.21 270)
-
Step 700
700 (this color)
#3F56D5
oklch(51.3% 0.196 270.1)
-
Step 800
800
#2F42A6
oklch(42.8% 0.162 269.9)
-
Step 900
900
#293983
oklch(37.7% 0.126 270.1)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#3F56D5 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) | #006AD9 | 0.053 |
| Deuteranopia (no green cones) | #005CD3 | 0.038 |
| Tritanopia (no blue cones) | #00768D | 0.158 |
| Achromatopsia (no color) | #636363 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F56D5
#3F56D5
oklch(51.3% 0.196 270.1)
- #7E6300
#7E6300
oklch(51.2% 0.105 90)
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 #3F56D5, closest first.
No curated palette has a color within ΔE 0.04 of #3F56D5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.018
- Azul #1D5DEC ΔE 0.044
- Neon Blue #4361EE ΔE 0.046
- Royal Blue #4169E1 ΔE 0.049
- Iris #6258C4 ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
- Slate Blue #6A5ACD ΔE 0.063
Use #3F56D5 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.