It’s 100% free.
System Requirements (Desktop only)
Windows 10 (64 bit)
Processor: Core i5-7500 / Ryzen 5 1600
Memory: 12GB RAM
Graphics: GTX 1060/ RX 580- 6GB VRAM
macOS – Apple Silicon recommended. Intel based Mac currently not supported.
An Internet connection is needed for Volta to work correctly.
You may need to unblock Volta from your Firewall.