About Modal
Serverless cloud for running, training, and serving AI workloads, including sandboxes.
Code Sandboxes
Alternatives to Modal
7 code sandboxes tools you can use instead of Modal, 3 of them open source. Summaries come from each vendor's own site. Links checked Oct 16, 2026.
At a glance
Modal alternatives compared
| Tool | What it does | Open source | Head to head |
|---|---|---|---|
| Agent 37 | Cloud sandboxes for running AI agents, positioned as lower-cost agent infrastructure. | No | Modal vs Agent 37 |
| AIO Sandbox | All-in-one agent sandbox with browser, shell, file access, VSCode Server, and MCP in one container. | Yes | Modal vs AIO Sandbox |
| Cloudflare Sandbox SDK | Run untrusted or generated code in Linux VMs or isolated Workers on Cloudflare. | No | Modal vs Cloudflare Sandbox SDK |
| Daytona | Secure sandboxes for running AI-generated code. | Yes | Modal vs Daytona |
| E2B | Isolated cloud machines for agents to run code, browse, and use tools. | Yes | Modal vs E2B |
| Runloop | Code sandboxes (Devboxes) for AI coding agents, plus evaluations. | No | Modal vs Runloop |
| Vercel Sandbox | Isolated Linux microVMs on Vercel for untrusted or agent-generated code. | No | Modal vs Vercel Sandbox |
Code Sandboxes
All 7 alternatives
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Agent 37
agent37.comCloud sandboxes for running AI agents, positioned as lower-cost agent infrastructure.
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AIO Sandbox
sandbox.agent-infra.comAll-in-one agent sandbox with browser, shell, file access, VSCode Server, and MCP in one container.
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Cloudflare Sandbox SDK
developers.cloudflare.comRun untrusted or generated code in Linux VMs or isolated Workers on Cloudflare.
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Daytona
daytona.ioSecure sandboxes for running AI-generated code.
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E2B
e2b.devIsolated cloud machines for agents to run code, browse, and use tools.
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Runloop
runloop.aiCode sandboxes (Devboxes) for AI coding agents, plus evaluations.
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Vercel Sandbox
vercel.comIsolated Linux microVMs on Vercel for untrusted or agent-generated code.
FAQ
Questions
What are the alternatives to Modal?
Agent Stack Directory lists 7 other code sandboxes tools: Agent 37, AIO Sandbox, Cloudflare Sandbox SDK, Daytona, E2B, Runloop, Vercel Sandbox.
Is there an open-source alternative to Modal?
Yes. Among the alternatives we list, these are marked open source: AIO Sandbox, Daytona, E2B.
What does Modal do?
Serverless cloud for running, training, and serving AI workloads, including sandboxes. (Summary based on modal.com, link checked 2026-10-16.)