Best Modal Sandboxes alternatives
The strongest Modal Sandboxes alternatives are E2B, Daytona, Beam Sandboxes. Pick based on what you need that Modal Sandboxes does not offer — see the reasons under each entry.
Why teams look beyond Modal Sandboxes
The best fit when scale or GPUs matter most, especially for teams already on Modal.
- Sandbox compute billed at roughly 3x Modal’s standard list rates
- Not open source and no documented BYOC
- gVisor by default rather than microVMs
Modal Sandboxes alternatives, ranked
E2B
Open-source cloud sandboxes for AI agents, each a Firecracker microVM, with pause/resume, snapshots and forking.
- Firecracker microVM
- Open source
- Self-hostable
- BYOC
- Pause/resume
Why it’s here: Code interpreters and short-to-medium-lived agent tasks that need microVM isolation, with an open-source self-host path. The safe default for most agent builders: mature, open source, microVM-isolated and widely supported.
Daytona
Stateful sandboxes for AI-generated code — Linux containers, Linux and Windows VMs, macOS and GPU sandboxes — with snapshots, volumes and preview URLs.
- Containers or VMs
- BYOC
- GPU
- Pause/resume
Why it’s here: Long-lived, stateful agent workspaces that need many SDK languages, GPUs, or Windows and macOS sandboxes. The strongest choice for stateful coding-agent workspaces and breadth of sandbox types; note the shift away from open source.
Beam Sandboxes
Serverless AI compute platform whose sandboxes are gVisor-isolated containers with memory snapshots, optional GPUs and an open-source, self-hostable runtime.
- gVisor
- Open source
- Self-hostable
- BYOC
- GPU
- Pause/resume
Why it’s here: Teams that want an open-source, self-hostable sandbox runtime with GPU access. A cost-effective GPU sandbox with an open runtime; best for trusted or semi-trusted code.
Northflank Sandboxes
Sandboxes on Northflank’s Kubernetes-based platform — microVMs for CPU work, gVisor for GPUs — on Northflank’s cloud or in your own cloud account.
- Cloud Hypervisor microVM
- BYOC
- GPU
- Pause/resume
Why it’s here: Teams that want sandboxes in their own cloud account (BYOC) alongside app hosting, databases and GPUs. Compelling for BYOC and all-in-one platform needs; review the October 2026 incident response before adopting.
Morph Cloud
VM-based cloud computers for AI agents built on “Infinibranch” snapshot, branch and restore, plus persistent Devboxes.
- VM
- Pause/resume
Why it’s here: Workloads that branch a running environment many times — parallel search, RL and evaluation rollouts. Purpose-built for branching workloads; a specialist pick for search, RL and evals.
Modal Sandboxes vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| Modal Sandboxes | gVisor or VM | No | No / Not documented | <1 s | Up to 24 h | Yes / Yes | Yes | Python, JavaScript/TypeScript, Go |
| E2B | Firecracker microVM | Yes | Yes / Yes | Not documented | 1 h / 24 h (Pro) | Yes / Yes | No | Python, JavaScript/TypeScript |
| Daytona | Containers or VMs | No | Not documented / Yes | <90 ms | Unlimited | Yes / Yes | Yes | Python, TypeScript, Ruby, Go, Java |
| Beam Sandboxes | gVisor | Yes | Yes / Yes | ~0.5 s | Configurable | Yes / Yes | Yes | Python, TypeScript |
| Northflank Sandboxes | Cloud Hypervisor microVM | No | No / Yes | <1 s | Unlimited | Not documented / Yes | Yes | JavaScript/TypeScript, Python |
| Morph Cloud | VM | No | No / Not documented | <250 ms (restore) | Configurable | Yes / Yes | Not documented | Python, TypeScript |
Frequently asked questions
What is the best alternative to Modal Sandboxes?
Is there an open-source alternative to Modal Sandboxes?
Cite this page
Agent Sandboxes. (2026). Best Modal Sandboxes alternatives. agentsandboxes.org. Last reviewed November 8, 2026. https://agentsandboxes.org/alternatives/modal/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.