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Alternatives

Upstash Box alternatives

Answer in brief

The 6 alternatives below are grouped by kind of sandbox, and each says what it does differently from Upstash Box. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.

By the Agent Sandboxes editors · Updated

Why teams look beyond Upstash Box

A persistent, CPU-time-billed workspace for coding agents that trades VM isolation for cheap idle time.

  • Container isolation rather than a VM; the vendor itself notes this is a weaker boundary than microVMs
  • Single region (AWS us-east-1)
  • No compliance certifications documented for Box
  • Pricing page figures for Medium and Large sizes are inconsistent between sections

Upstash Box alternatives, by kind

Hosted sandbox platforms

SDK-driven sandboxes you create, run code in and destroy through an API.

  • 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

    How it differs: 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.

    Full profile →Daytona alternativesWebsite ↗

Persistent VMs and agent computers

Full, long-lived virtual machines that an agent keeps, forks and returns to.

  • boat

    Persistent Ubuntu VMs for AI agents in EU data centres, with SSH, Docker, disk snapshots, forking, a 60 fps virtual desktop and per-second billing from a $20/month plan.

    • Full VM, own kernel
    • Pause/resume

    How it differs: Long-lived EU-hosted VMs that an agent keeps for days, with SSH, Docker and a desktop. A low-priced EU-hosted full VM for agents that need persistence and a desktop, less suited to high-burst, compliance-gated or US-resident workloads.

    Full profile →boat alternativesWebsite ↗

  • exe.dev

    Persistent root VMs for people and their agents, driven entirely over SSH (or the same commands via HTTPS and MCP), with replicated NVMe storage, VM copies and flat-rate CPU/RAM pools in nine regions.

    • VM (VMM per VM)
    • BYOC
    • Snapshots

    How it differs: Developers who want a fleet of persistent root VMs they and their agents reach over SSH, at a flat monthly price. A flat-rate fleet of persistent SSH-driven VMs for agent-assisted developers, rather than an SDK-driven sandbox API for high-volume automation.

    Full profile →exe.dev alternativesWebsite ↗

  • 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.

    Full profile →Fly.io Sprites alternativesWebsite ↗

  • Freestyle

    Full Linux VMs for AI agents with live forking of running VMs, memory-preserving hibernation, VPCs and nested virtualization.

    • VM
    • Pause/resume

    How it differs: Long-running coding agents that need full VMs — Docker, nested virtualization — with fork and hibernate. The most capable “real VM” for agents, with live forking; a strong pick for complex coding agents.

    Full profile →Website ↗

Compute platforms with sandboxes

General serverless or app platforms that also offer sandboxes, often with GPUs.

  • Railway Sandboxes

    On-demand Linux VMs inside a Railway environment with forks, checkpoints, Docker, private networking to your services and per-second billing; generally available since September 2026.

    • Linux VM
    • Snapshots

    How it differs: Coding agents and test runs that need to reach your Railway databases and services over the private network. The natural sandbox for teams already deploying on Railway, strongest when agents need private-network access to existing services.

    Full profile →Railway Sandboxes alternativesWebsite ↗

Upstash Box vs alternatives

SandboxIsolationOpen sourceSelf-host / BYOCCold start (vendor)Max sessionSnapshots / pauseGPUSDKs
Upstash BoxDocker containerNoNo / NoNot documentedNo cap (idle pause 1 h / 6 h)Yes / YesNoJavaScript/TypeScript, Python, CLI, MCP server
boatFull VM, own kernelNoNo / NoNot documentedNo cap (auto-stop 1 h default)Yes / YesNoPython, JavaScript/TypeScript, CLI, REST API
DaytonaContainers or VMsNoNot documented / Yes<90 msUnlimitedYes / YesYesPython, TypeScript, Ruby, Go, Java
exe.devVM (VMM per VM)NoNo / Yes~1 s (claim)No capYes / Not documentedNot documentedCLI (over SSH), HTTPS API, MCP server
Fly.io SpritesMicroVMNoNo / No0.1–2 s wakeUnlimitedYes / YesNoJavaScript/TypeScript, Go, Python, Elixir
FreestyleVMNoNo / Not documented65 msUnlimited (paid)Yes / YesNot documentedTypeScript
Railway SandboxesLinux VMNoNo / NoNot documentedNo cap (idle 30 min default)Yes / NoNot documentedJavaScript/TypeScript, CLI, GraphQL API

Frequently asked questions

What are the main alternatives to Upstash Box?
boat, Daytona, exe.dev, Fly.io Sprites, Freestyle, Railway Sandboxes. Which one fits depends on what you need that Upstash Box does not offer; each entry above explains how it differs.
Is there an open-source alternative to Upstash Box?
Among the alternatives listed here, none is fully open source; see the self-hosting guide.

Cite this page

Agent Sandboxes. (2026). Upstash Box alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/upstash-box/

Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.