Deno Sandbox alternatives
Because Deno Sandbox is winding down, teams are moving elsewhere. The 5 alternatives below are grouped by kind of sandbox, and each says what it does differently from Deno Sandbox. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond Deno Sandbox
Deno Sandbox is no longer included in Deno Deploy plans and is not available to new customers as of November 2026, following the announcement that Deno is joining Cloudflare.
- Not available to new customers as of November 2026
- Lifetime capped at 30 minutes per the About page, with no pause/resume of a running VM
- Fixed 2 vCPUs and at most 4 GB memory; volumes only in the Chicago region
- Pre-release default of 5 concurrent sandboxes per organisation
Deno Sandbox alternatives, by kind
Hosted sandbox platforms
SDK-driven sandboxes you create, run code in and destroy through an API.
Cloudflare Sandbox SDK
A TypeScript SDK for Cloudflare Workers that runs untrusted code in Linux sandboxes backed by Cloudflare Containers and Durable Objects.
- MicroVM (Containers)
- Open source
- Snapshots
How it differs: Teams building on Cloudflare Workers that want per-user sandboxes with egress and credentials controlled in code. A strong, programmable option for Workers developers; less suited to Python-first agent stacks.
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
How it differs: 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.
HopX
Firecracker microVM sandboxes from Bunnyshell with template-based sizing, memory-preserving pause, VNC desktop automation, an MCP server and $200 of free credits.
- Firecracker microVM
- Pause/resume
How it differs: Pay-per-second microVM sandboxes with desktop automation and no session limits. A simple per-second Firecracker sandbox with desktop tooling, documented more thinly on security and regions than its larger peers.
Vercel Sandbox
Firecracker microVM sandboxes on Vercel’s infrastructure, persistent by default and billed on active CPU, with fine-grained egress control.
- Firecracker microVM
- Pause/resume
How it differs: Teams on Vercel and agent builders who want microVM isolation, active-CPU billing and credential brokering. A polished microVM sandbox with standout egress and billing design; the obvious pick for Vercel-centric teams.
Persistent VMs and agent computers
Full, long-lived virtual machines that an agent keeps, forks and returns to.
Fly.io Sprites
Persistent, hardware-isolated Linux computers for AI agents with a durable 100 GB disk, checkpoints, and no compute charges while idle.
- MicroVM
- Pause/resume
How it differs: Long-running, stateful agent computers that should cost nothing while idle. The most natural “persistent computer per agent” model, with idle-free billing.
Deno Sandbox vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| Deno Sandbox | Firecracker microVM | No | No / No | <200 ms (claim) | 30 min (extendable) | Yes / No | No | JavaScript/TypeScript, Python, CLI, REST API |
| Cloudflare Sandbox SDK | MicroVM (Containers) | Yes | No / No | 1–3 s | No fixed cap | Yes / Not documented | Not documented | TypeScript (Workers) |
| E2B | Firecracker microVM | Yes | Yes / Yes | Not documented | 1 h / 24 h (Pro) | Yes / Yes | No | Python, JavaScript/TypeScript |
| Fly.io Sprites | MicroVM | No | No / No | 0.1–2 s wake | Unlimited | Yes / Yes | No | JavaScript/TypeScript, Go, Python, Elixir |
| HopX | Firecracker microVM | No | No / No | ~100 ms (claim) | No cap | Not documented / Yes | Not documented | Python, JavaScript/TypeScript, CLI, REST API, MCP server |
| Vercel Sandbox | Firecracker microVM | No | No / No | Milliseconds (claim) | 24 h (Pro) | Yes / Yes | Not documented | JavaScript/TypeScript, Python |
Frequently asked questions
What are the main alternatives to Deno Sandbox?
Is there an open-source alternative to Deno Sandbox?
Cite this page
Agent Sandboxes. (2026). Deno Sandbox alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/deno-sandbox/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.