rootfs
Checkpointed rootfs instead of only ephemeral work
Use pause/resume for same-sandbox continuity, then use named rootfs snapshots when an initialized workspace should become reusable state.
Read docsE2B alternative
E2B alternative for AI agent sandboxes
Compare E2B Sandbox with Sandbox0 when your product needs more than code execution: persistent rootfs state, network policy, egress auth, self-hosted deployment, and clear usage metering boundaries.
If you started with E2B Code Interpreter, an E2B sandbox, or an E2B sandbox alternative search, this page focuses on the runtime infrastructure tradeoffs instead of model quality or agent prompt behavior. Use it when you need a sandbox for AI agents or an AI code execution sandbox with more explicit infrastructure control.
Comparison
E2B is a strong hosted sandbox. Sandbox0 optimizes for runtime control.
Use this comparison to decide whether a hosted sandbox and code-interpreter API is the right boundary, or whether your platform needs sandbox infrastructure with persistent storage, network policy, and self-hosted operations as first-class pieces.
| Dimension | E2B Sandbox | Sandbox0 |
|---|---|---|
| Product boundary | E2B provides cloud sandboxes and SDKs for agents that need code execution, tool use, and managed sandbox sessions. | Sandbox0 exposes sandbox runtime primitives for teams that want more control over the execution plane, control plane, storage, policy, and metering boundary. |
| Templates and startup | E2B templates define the base image, environment, files, commands, and start command; E2B serializes template state so sandboxes can start quickly. | Sandbox0 templates define a digest-pinned image, resource and RootFS defaults, security class, ephemeral mounts, environment, and network defaults. Compatible templates share resource-neutral warm carriers. |
| Persistent sessions | E2B pause/resume preserves filesystem and memory state, with auto-pause and plan-specific continuous runtime limits. | Sandbox0 pause checkpoints the writable rootfs, releases the runtime allocation, keeps sandbox identity and configuration, and restores the latest rootfs checkpoint into fresh compute on resume. |
| Snapshots and branching | E2B snapshots capture a running sandbox state and can be used to spawn new sandboxes from that captured state. | Sandbox0 rootfs snapshots are named point-in-time records from running or paused sandboxes. Teams can claim with snapshot_id, restore a paused target, or fork a running or paused source. |
| Storage model | E2B pause/resume preserves filesystem and memory for one sandbox, while snapshots capture both from a running sandbox and can initialize many new sandboxes. | Sandbox0 checkpoints the writable rootfs for pause and resume, then provides named rootfs snapshots, restore, and forks for reusable workspace state. |
| Network and credentials | E2B documents outbound internet controls, allow and deny lists, domain filtering, and public-beta per-host request transforms. | Sandbox0 uses SandboxNetworkPolicy with ordered trafficRules, protocolRules, credentialRules, egress proxy support, and placeholder substitution at the egress boundary. |
| Deployment control | E2B presents its sandbox runtime as a managed cloud product. | Sandbox0 has an Apache-2.0 self-hosted runtime for dedicated Nomad clients, with region-scoped gateways and one or more data-plane clusters. |
| Pricing and metering | E2B publishes usage-based pricing and plan limits for sandbox runtime, resources, concurrency, and builds. | Sandbox0 Cloud publishes $0.015/GiB-hour compute (billed by the second at approximately $0.000004167/GiB-second) and $0.02/GiB-month storage. Ingress, egress, and object-store GET and PUT requests are currently free. |
Sandbox0 strengths
Runtime primitives for agent platforms that keep state.
Sandbox0 is strongest when the sandbox is not just a temporary code execution box. It is the runtime substrate for agent workspaces, credentials, tools, traffic rules, snapshots, and recoverable state.
network
Network policy as a sandbox contract
Use block-all defaults, ordered allow rules, protocol controls, egress proxy paths, and runtime network policy updates.
Read docscredentials
Credential injection at egress
Let sandbox processes send placeholders while ctld's network runtime resolves and injects the real credential only for matching outbound traffic.
Read docsWhen to choose E2B
Choose E2B when its managed sandbox API is the product boundary.
You want the E2B SDK, E2B Code Interpreter, or E2B's managed sandbox product boundary.
You rely on E2B's prebuilt agent templates or desktop and computer-use sandbox tooling.
Your team has already standardized on E2B sandbox sessions and only needs the documented E2B controls.
When to choose Sandbox0
Choose Sandbox0 when the sandbox is infrastructure you need to control.
You need an E2B sandbox alternative whose runtime plane can be self-hosted on dedicated Nomad clients.
You want checkpointed rootfs, named rootfs snapshots, restore, and forks in one platform model.
You need outbound network policy, protocol controls, and credential injection to be part of the sandbox contract.
You want usage truth in the open-source data plane while pricing and billing stay in the cloud billing layer.
E2B pricing
Compare published usage rates and the infrastructure behind them.
E2B pricing is published as usage-based pricing with plan limits. Sandbox0 Cloud publishes $0.015/GiB-hour compute (billed by the second at approximately $0.000004167/GiB-second) and $0.02/GiB-month storage, with ingress, egress, and object-store GET and PUT requests currently free. Model both rate cards against the resources and lifecycle your workload actually uses.
The supported Sandbox0 claim today is architectural: the open-source Sandbox0 repo records usage truth in the data plane and exports metering windows, while pricing, rating, invoices, and payments belong outside the open-source data plane.
Source check
Primary docs checked for this E2B alternatives page.
FAQ
Questions teams ask when comparing E2B alternatives.
Is Sandbox0 an E2B drop-in replacement?
No. Sandbox0 is not positioned as a complete E2B SDK or E2B Code Interpreter drop-in replacement. Treat it as a different AI agent sandbox runtime boundary and verify the API surface your product needs.
What makes Sandbox0 an E2B sandbox alternative?
Sandbox0 is worth evaluating when teams need persistent rootfs checkpoints, rootfs snapshots and forks, network policy, egress credential injection, a self-hosted Nomad runtime, and explicit usage metering boundaries.
How should I compare E2B pricing with Sandbox0 pricing?
Both products publish usage-based pricing. Sandbox0 Cloud charges $0.015/GiB-hour compute (billed by the second at approximately $0.000004167/GiB-second) and $0.02/GiB-month storage, while ingress, egress, and object-store GET and PUT requests are currently free. Compare the complete meters and product boundaries for your workload.
Does Sandbox0 replace E2B Code Interpreter?
Not directly. E2B Code Interpreter offers a code-interpreter-oriented SDK. Sandbox0 exposes lower-level sandbox, process, file, rootfs snapshot, network, and credential primitives for teams building their own agent runtime platform.
Can Sandbox0 be self-hosted?
Yes. Sandbox0 supports a self-hosted Nomad runtime on dedicated sandbox nodes, with region-scoped gateways and data-plane clusters for teams that need to control where sandbox workloads run.
Build AI agent sandboxes on infrastructure you can inspect.
Start with Sandbox0 when your agent product needs persistent workspaces, rootfs snapshots and forks, network controls, and self-hosted deployment options around the sandbox runtime.