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ephemora-cell alternatives

Curated alternatives to ephemora-cell — and why you'd switch.

CubeSandbox

Hardware-isolated microVM sandboxes for AI agents — sub-60ms boot, <5MB overhead, E2B-compatible API, self-hosted on your own KVM nodes.

Why switchBoth isolate agent code execution; cubesandbox is a hardware-isolated microVM with an E2B-style API for full workloads, Cell is a WASM capability boundary for tools and snippets.
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OpenSandbox

CNCF-landscape sandbox platform for AI agents: multi-language SDKs, unified API, CLI and MCP over Docker/Kubernetes runtimes — coding agents, GUI agents, evals and RL training.

Why switchopensandbox exposes sandboxes over Docker/K8s via SDKs and MCP; Cell is the in-process WASM alternative when you don't need a whole OS per execution.
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arcbox

Open-source container and VM runtime for macOS in pure Rust: drop-in Docker engine, sub-100ms agent sandboxes (`abctl claude`), full Linux VMs and throwaway macOS guests on one daemon.

Why switchTwo answers to 'where does agent-written code run': arcbox gives a real container/VM on macOS, ephemora-cell a sub-millisecond WASM capability boundary — pick by whether the workload needs an OS.
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forkd

fork() for agent microVMs: children fork copy-on-write from a warm Firecracker parent — 100 KVM-isolated VMs in ~100ms, live-VM branching in ~56ms, portable snapshots from a hub.

Why switchforkd forks Firecracker microVMs copy-on-write for ms-scale agent sandboxes; Cell gets sub-ms by staying inside wasmtime - different trade-off on what code can run.
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superserve

Persistent, secure sandboxes for AI agents on Firecracker microVMs — TypeScript and Python SDKs, CLI and console; the runtime is a hosted service, the SDK stack is Apache-2.0.

Why switchsuperserve offers persistent Firecracker sandboxes with SDKs; Cell is ephemeral, stateless per-execution WASM with signed records instead of persistence.
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