User-space kernel sandboxes
5 providers listed here run sandboxes in user-space kernels, including Agent37 Cloud, Bunny Sandbox and Cua Fleets. Prices start at $0.001 per vCPU-hour.
Updated
What a user-space kernel is
A user-space kernel is a kernel that runs as a normal program. It handles the system calls of the sandbox, so the code in the sandbox does not talk to the host kernel directly. It needs no hardware virtualization.
Providers using user-space kernels5 providers
Provider
Isolation
vCPU / hrsorted, low to high
GiB / hr
Free tier
Max session
GPU
Agent37 CloudPersistent Linux sandboxes and VMs for code and agents.- Isolation
- gVisor
- vCPU / hr
- $0.001
- Free tier
- $5 credit
Bunny SandboxIsolated cloud sandboxes for AI agents, run on gVisor.- Isolation
- gVisor
- vCPU / hr
- $0.020
- Free tier
- Not listed
Cua FleetsHosted Linux and Windows sandboxes for computer-use agents.- Isolation
- gVisor
- vCPU / hr
- $0.045
- Free tier
- Not listed
ModalServerless compute with sandboxes and GPUs.- Isolation
- gVisor
- vCPU / hr
- $0.071
- Free tier
- $30 / month
Sandbox0Long-running agent sandboxes with durable storage.- Isolation
- gVisor
- vCPU / hr
- Included
- Free tier
- Not listed
Hourly cost
2 vCPU · 4 GiBOne sandbox with 2 vCPU and 4 GiB of RAM for one hour, at list price.
Agent37 CloudBunny SandboxSandbox0Cua FleetsModalCompare these providers
Other isolation types
Providers listed for each type