#3F5DEF
Closest named color: Neon Blue (#4361EE). oklch(54.8% 0.221 268.8), rgb(63, 93, 239).
Aa
White text reads best on this color (5.21:1).
About this color
#3F5DEF is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.221 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.011 away. White text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.221) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.02:1 |
| White text | 5.21:1 |
Values
| HEX | #3F5DEF |
| RGB | rgb(63, 93, 239) |
| HSL | hsl(230, 85%, 59%) |
| OKLCH | oklch(54.8% 0.221 268.8) |
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 #3F5DEF | 5.21:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #3F5DEF | 4.02:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #3F5DEF text on white | 5.21:1 | AA | Lc 75.2 | Fine for body text |
| #3F5DEF text on black | 4.02:1 | AA large text | Lc -26.5 | 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 600.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFE
oklch(93.7% 0.028 268.4)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#597CFF
oklch(63% 0.198 268.8)
-
Step 600
600 (this color)
#3F5DEF
oklch(54.8% 0.221 268.8)
-
Step 700
700
#344ED3
oklch(49.2% 0.206 268.8)
-
Step 800
800
#2B41AA
oklch(42.7% 0.17 268.8)
-
Step 900
900
#263987
oklch(37.8% 0.132 268.8)
-
Step 950
950
#16224F
oklch(27% 0.084 268.9)
#3F5DEF 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) | #0075F4 | 0.058 |
| Deuteranopia (no green cones) | #0064EC | 0.035 |
| Tritanopia (no blue cones) | #00839D | 0.176 |
| Achromatopsia (no color) | #6C6C6C | 0.222 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5DEF
#3F5DEF
oklch(54.8% 0.221 268.8)
- #8B6C00
#8B6C00
oklch(54.7% 0.112 88.7)
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 #3F5DEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.011
- Azul #1D5DEC ΔE 0.027
- Warm Blue #4B57DB ΔE 0.035
- Royal Blue #4169E1 ΔE 0.036
- Bright Blue #0165FC ΔE 0.038
- Cerulean Blue #056EEE ΔE 0.044
- Electric Blue #0652FF ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.068
Use #3F5DEF 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.