#3F64E7
Closest named color: Neon Blue (#4361EE). oklch(55.4% 0.203 267.3), rgb(63, 100, 231).
Aa
White text reads best on this color (5.01:1).
About this color
#3F64E7 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.203 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.013 away. White text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.203) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.18:1 |
| White text | 5.01:1 |
Values
| HEX | #3F64E7 |
| RGB | rgb(63, 100, 231) |
| HSL | hsl(227, 78%, 58%) |
| OKLCH | oklch(55.4% 0.203 267.3) |
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 #3F64E7 | 5.01:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #3F64E7 | 4.18:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #3F64E7 text on white | 5.01:1 | AA | Lc 74.1 | Content text, not long reading |
| #3F64E7 text on black | 4.18:1 | AA large text | Lc -27.6 | 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 600.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A7BFFC
oklch(80.9% 0.091 267.7)
-
Step 400
400
#789CFB
oklch(70.8% 0.145 267)
-
Step 500
500
#587FF9
oklch(63.1% 0.187 267.5)
-
Step 600
600 (this color)
#3F64E7
oklch(55.4% 0.203 267.3)
-
Step 700
700
#3252CA
oklch(49% 0.19 267.4)
-
Step 800
800
#2A44A3
oklch(42.7% 0.157 267.6)
-
Step 900
900
#253B81
oklch(37.7% 0.121 267.2)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#3F64E7 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) | #0077EB | 0.049 |
| Deuteranopia (no green cones) | #0068E4 | 0.033 |
| Tritanopia (no blue cones) | #00859C | 0.162 |
| Achromatopsia (no color) | #6F6F6F | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F64E7
#3F64E7
oklch(55.4% 0.203 267.3)
- #8F6D00
#8F6D00
oklch(55.3% 0.113 86.9)
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 #3F64E7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.013
- Royal Blue #4169E1 ΔE 0.016
- Azul #1D5DEC ΔE 0.034
- Warm Blue #4B57DB ΔE 0.035
- Cerulean Blue #056EEE ΔE 0.035
- Bright Blue #0165FC ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.058
- Clear Blue #247AFD ΔE 0.060
Use #3F64E7 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.