Fly.io
Persistent Linux microVMs (Sprites) that hibernate when idle and wake in 100–500ms. CPU $0.07/CPU-hr, memory $0.04375/GB-hr, hot NVMe storage $0.00068/GB-hr, 100GB per Sprite. Bill
Fly.io scores 4.6/10 for free value in Agents. The main constraint: Paid — Pay-as-you-go; CPU $0.07/CPU-hr, no charge when idle. Persistent Linux microVMs (Sprites) that hibernate when idle and wake in 100–500ms. CPU $0.07/CPU-hr, memory $0.04375/GB-hr, hot NVMe storage $0.00068/GB-hr, 100GB per Sprite. Billed per second on actual usage; no charg.
Free value score
4.6 / 10Show the math
Key metrics
What you get
Paid — Pay-as-you-go; CPU $0.07/CPU-hr, no charge when idle. Persistent Linux microVMs (Sprites) that hibernate when idle and wake in 100–500ms. CPU $0.07/CPU-hr, memory $0.04375/GB-hr, hot NVMe storage $0.00068/GB-hr, 100GB per Sprite. Billed per second on actual usage; no charg
Idle time is free — strong for bursty long-lived agents that mostly wait; Firecracker isolation
Gotchas
No gotchas documented yet. Contribute one if you know a constraint we missed.
Sources
-
"Fly.io Sprites | $0.07/CPU-hr | $0.04375/GB-hr | $0.00068/GB-hr (hot NVMe) ... No charge when idle"
https://northflank.com/blog/best-persistent-sandbox-platforms