What They Have in Common
Both OmniRun and E2B solve the same core problem: giving AI agents a safe place to execute code. You create a sandbox, run commands inside it, and tear it down when you are done. Both platforms offer TypeScript and Python SDKs and snapshot-based startup.
Both support filesystem operations, process execution, and internet access from within sandboxes. If your agent needs to install packages, write files, or run scripts, either platform will work. The differences are where they run, how they protect data in transit, and what extras they offer.
Isolation: both run Firecracker microVMs
Both OmniRun and E2B execute each sandbox inside a Firecracker microVM with its own Linux kernel, the same KVM-based hardware isolation model behind AWS Lambda. On either platform sandboxes do not share a kernel. If you are choosing between them for isolation strength alone, they are in the same class.
The real differences are not the isolation primitive. They are where the VM runs (data residency and self-hosting), who operates the machine (managed or self-hosted), and what each is built for. Those are covered below.
Boot Time
OmniRun restores sandboxes from Firecracker snapshots rather than cold-booting a kernel; a base-template sandbox is typically ready in under a second. We have not benchmarked E2B, so we won't quote a comparison. Measure both with your own workload if startup time matters to you.
Desktop Sandboxes
Both platforms support GUI desktop environments accessible via VNC or browser streaming. OmniRun provides full XFCE desktop sandboxes with VNC access, letting AI agents interact with graphical applications, browsers, and desktop software. E2B offers a similar desktop sandbox capability. If your agent needs to automate web browsers, fill out forms, or interact with GUI applications, both platforms have you covered.
Payload Encryption
OmniRun offers optional payload encryption to the worker: command, code-execution, and file read/write payloads are encrypted with AES-256-GCM (ECDH P-256 key agreement) on top of TLS. The worker decrypts them to run your code, so this is not end-to-end encryption — whoever operates the worker can read the plaintext.
If the provider must never see your data, encryption alone does not get you there on any sandbox platform: the code has to run in plaintext somewhere. The option that does change who can see it is running the worker yourself, so the machine that decrypts is one you control.
SDKs and Developer Experience
Both platforms offer TypeScript and Python SDKs with a similar shape: create a sandbox, execute commands, manage files, tear down. OmniRun exposes an e2b-style REST API, but it is not a drop-in replacement: use the OmniRun SDKs rather than pointing the E2B SDK at OmniRun, and expect to adjust option names and templates when you port code.
OmniRun also ships a CLI tool for managing sandboxes from the terminal, which is useful for debugging, scripting, and CI/CD pipelines where you want sandbox access without writing SDK code.
Pricing
OmniRun plans include a monthly allowance of sandbox-hours, with overage from €0.19 per sandbox-hour billed per second (see the pricing page for current tiers). E2B prices by vCPU and RAM usage; check its pricing page for current rates.
OmniRun offers a 25 free sandbox-hours to get started with no credit card required. E2B provides a free tier with limited sandbox hours. For production workloads, both platforms are competitively priced -- the cost difference is unlikely to be the deciding factor.
When to Choose OmniRun
- EU residency or self-hosting -- run in the EU (Hetzner), or self-host the worker on your own infrastructure so code stays in your perimeter
- Claude Managed Agents -- OmniRun is built to be the self-hosted execution backend for Anthropic's managed agents
- Keeping data in-house -- self-host the worker when the machine that runs and decrypts your code must be one you control
- Desktop automation -- GUI-based agent workflows with full XFCE desktop access
When to Choose E2B
- Broader ecosystem -- E2B has been around longer and has a larger community with more templates and integrations
- Open-source infra -- E2B's infrastructure is open-source if you want to run and modify the full stack yourself today
- Existing E2B investment -- if your team already uses E2B and doesn't need EU residency or self-hosting, switching has a cost
The Bottom Line
Both OmniRun and E2B run untrusted code in Firecracker microVMs, so the isolation floor is the same. The choice comes down to where the VM runs and who operates it. If you need EU data residency, a self-hosted worker, or a self-hosted backend for Claude Managed Agents, OmniRun is built for that. If you want the larger ecosystem and longer track record, E2B is a proven option.