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Alternatives

Runtime alternatives

Answer in brief

The 6 alternatives below are grouped by kind of sandbox, and each says what it does differently from Runtime. 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 Runtime

Aggressively priced and feature-dense, but single-region and unaudited; well suited to cost-driven batch agent work rather than regulated deployments.

  • Single region (Virginia, US) with no option to run elsewhere.
  • No startup latency figures are currently published, and no own compliance certification.
  • Young service with a minimal public footprint (1 star on the client repository).
  • Waiting sandboxes still bill memory plus a CPU floor, so idle time is not free unless paused.

Runtime 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 ↗

  • 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.

    Full profile →E2B alternativesWebsite ↗

  • InstaVM

    Firecracker-based Linux microVMs for agents with sub-200 ms claimed boots, snapshots, clones, persistent volumes, a desktop runtime and SSH access, with a local Apple-container companion (CodeRunner).

    • Firecracker microVM
    • Pause/resume

    How it differs: Agent builders who want fast-booting microVMs with desktop, SSH and snapshot-clone workflows under per-second billing. A broad, fast microVM platform for agent builders; confirm regions and session limits with the vendor before committing production workloads.

    Full profile →InstaVM alternativesWebsite ↗

  • Leap0

    Firecracker microVM sandboxes in public preview, free during preview, with memory snapshots, forks, a per-sandbox firewall with credential-injecting header transforms and an XFCE desktop.

    • Firecracker microVM
    • BYOC
    • Pause/resume

    How it differs: Trying a full-featured microVM sandbox (desktop, LSP, git, snapshots) at no cost while it is in public preview. Feature-rich and free for now, but a preview service to trial rather than to build production dependencies on until billing and stability are settled.

    Full profile →Leap0 alternativesWebsite ↗

  • Superserve

    Persistent Firecracker microVM sandboxes for long-running agents, with pause/resume, memory-and-disk snapshots, forks and a credentials broker that keeps secrets out of the sandbox.

    • Firecracker microVM
    • BYOC
    • Pause/resume

    How it differs: Long-running coding and personal agents that need a persistent VM with pause, forks and brokered credentials. A well-documented persistent-VM sandbox whose credentials broker suits agents that must call third-party APIs safely.

    Full profile →Superserve alternativesWebsite ↗

  • Tenki Sandbox

    Full Linux VMs for agents from the Tenki CI-runner company, booting from Ceph-backed disks in under a second (claimed), with pause, memory snapshots, forks and volumes at per-second rates.

    • Single-tenant VM
    • Pause/resume

    How it differs: Coding agents that need a full Linux VM with Docker and systemd, pausable between tasks, at per-second rates. A sensible per-second VM sandbox from a CI vendor with real infrastructure, provided you can live with the undocumented hypervisor and region list.

    Full profile →Tenki Sandbox alternativesWebsite ↗

Runtime vs alternatives

SandboxIsolationOpen sourceSelf-host / BYOCCold start (vendor)Max sessionSnapshots / pauseGPUSDKs
RuntimeFirecracker microVMNoNo / NoNot documentedNo limit documentedYes / YesNot documentedJavaScript/TypeScript, Python, Go, Ruby, Java, CLI, REST API, MCP server
DaytonaContainers or VMsNoNot documented / Yes<90 msUnlimitedYes / YesYesPython, TypeScript, Ruby, Go, Java
E2BFirecracker microVMYesYes / YesNot documented1 h / 24 h (Pro)Yes / YesNoPython, JavaScript/TypeScript
InstaVMFirecracker microVMNoNo / No<200 ms (claim)ConfigurableYes / YesNot documentedPython, JavaScript/TypeScript, CLI, REST API
Leap0Firecracker microVMNoNo / Yes~100 ms (claim)8 h maxYes / YesNot documentedPython, JavaScript/TypeScript, Go, MCP server
SuperserveFirecracker microVMNoNo / YesNot documentedUnlimitedYes / YesNot documentedPython, JavaScript/TypeScript, CLI, REST API, MCP server
Tenki SandboxSingle-tenant VMNoNo / No<1 s (claim)Configurable; sticky = unlimitedYes / YesNot documentedJavaScript/TypeScript, Python, Go, CLI

Frequently asked questions

What are the main alternatives to Runtime?
Daytona, E2B, InstaVM, Leap0, Superserve, Tenki Sandbox. Which one fits depends on what you need that Runtime does not offer; each entry above explains how it differs.
Is there an open-source alternative to Runtime?
Yes: E2B.

Cite this page

Agent Sandboxes. (2026). Runtime alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/withruntime/

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