Open-source Runtime alternatives
10 open-source sandbox providers you can use instead of Runtime. Celesto Cloud has the lowest hourly price, $0.030 for 2 vCPU and 4 GiB. Beam Sandboxes offers GPUs, which Runtime does not.
Updated
Runtime, for reference
RuntimeFirecracker microVM sandboxes for AI agents, billed on the CPU that code uses.
IsolationFirecracker
2 vCPU · 4 GiB$0.080 / hr
Free tier100 free hours
Max sessionNo limit
10 open-source alternatives to Runtime
Sorted by hourly price for 2 vCPU · 4 GiB, low to high
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Celesto Cloud
Cloud computers for AI agents, each in a microVM.MicroVMLower vCPU priceSnapshot and resume keep processes intact$0.030per hour
Everstack
Open-source platform that runs isolated sandboxes for AI agents.Snapshots and templates$5 credit, valid 30 days after signup$0.133per hour
$0.158per hour
microsandbox cloud
Hosted microVM sandboxes for AI agents and untrusted code.MicroVMDisk only, from stopped persistent sandboxesFree plan, 5 computer-hours a month$0.165per hour
Smol Machines
Hosted Linux microVMs with their own kernel, for agents and untrusted code.MicroVMCheckpoints keep disk, RAM and processes. Branch makes live copy-on-write clones.$100 credit, one time$0.165per hour
E2B
Open-source sandbox platform that gives AI agents isolated machines.Firecracker4 regions$100 credit, one time$0.166per hour
PandaStack Sandbox
Firecracker microVM sandboxes for AI agents.Firecracker$5.40 usage credit every monthGDPR$0.173per hour
Beam Sandboxes
Isolated, secure environments for running untrusted code at scale.GPUContainerFilesystem or live memory$0.227per hour
Not listedper hour
Not listedper hour
Side by side
Runtime first, then the 10 alternatives
Provider
Isolation
vCPU / hr
GiB / hr
Free tier
Max session
GPU
- Isolation
- Firecracker
- vCPU / hr
- $0.025
- Free tier
- 100 free hours
- Isolation
- MicroVM
- vCPU / hr
- $0.015
- Free tier
- $5 credit
- Isolation
- Not listed
- vCPU / hr
- $0.067
- Free tier
- $5 credit
- Isolation
- MicroVM
- vCPU / hr
- $0.050
- Free tier
- $100 credit
- Isolation
- MicroVM
- vCPU / hr
- $0.050
- Free tier
- Free plan
- Isolation
- MicroVM
- vCPU / hr
- $0.050
- Free tier
- $100 credit
- Isolation
- Firecracker
- vCPU / hr
- $0.050
- Free tier
- $100 credit
- Isolation
- Firecracker
- vCPU / hr
- $0.054
- Free tier
- $5.40 / month
- Isolation
- Container
- vCPU / hr
- $0.068
- Free tier
- Not listed
- Isolation
- Container
- vCPU / hr
- Not listed
- Free tier
- Not listed
- Isolation
- Container
- vCPU / hr
- Not listed
- Free tier
- None