Tenki Sandbox alternatives
The 6 alternatives below are grouped by kind of sandbox, and each says what it does differently from Tenki Sandbox. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond Tenki Sandbox
A sensible per-second VM sandbox from a CI vendor with real infrastructure, provided you can live with the undocumented hypervisor and region list.
- Hypervisor, regions, default session duration and maximum VM sizes are not documented.
- Compliance is inherited from the parent company rather than attested for the sandbox product.
- Networking policy is fixed at creation time and cannot be changed on a running session.
- The product page mixes sandbox and CI-runner claims and reviews.
Tenki Sandbox 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.
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.
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.
Runtime
Firecracker microVM sandboxes billed on active CPU at $0.025 per vCPU-hour, with pause that keeps memory, forks, SDKs in five languages and no plan fee.
- Firecracker microVM
- Pause/resume
How it differs: Cost-sensitive agent workloads with many short runs, where active-CPU billing and a free monthly allowance matter. Aggressively priced and feature-dense, but single-region and unaudited; well suited to cost-driven batch agent work rather than regulated deployments.
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.
Compute platforms with sandboxes
General serverless or app platforms that also offer sandboxes, often with GPUs.
Namespace
Isolated Linux, macOS and Windows VM instances and persistent Devboxes on a developer-compute cloud, with an SDK, egress policy and SOC 2 Type II.
- KVM virtual machine
- Pause/resume
How it differs: Teams that want macOS, Windows and Linux VMs for agents and CI from one SDK, plus persistent Devboxes for coding agents. A CI-grade compute cloud whose VMs and Devboxes suit teams needing macOS or Windows and compliance more than minimal per-sandbox cost.
Tenki Sandbox vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| Tenki Sandbox | Single-tenant VM | No | No / No | <1 s (claim) | Configurable; sticky = unlimited | Yes / Yes | Not documented | JavaScript/TypeScript, Python, Go, CLI |
| Daytona | Containers or VMs | No | Not documented / Yes | <90 ms | Unlimited | Yes / Yes | Yes | Python, TypeScript, Ruby, Go, Java |
| E2B | Firecracker microVM | Yes | Yes / Yes | Not documented | 1 h / 24 h (Pro) | Yes / Yes | No | Python, JavaScript/TypeScript |
| InstaVM | Firecracker microVM | No | No / No | <200 ms (claim) | Configurable | Yes / Yes | Not documented | Python, JavaScript/TypeScript, CLI, REST API |
| Namespace | KVM virtual machine | No | No / No | Not documented | Deadline-based; Devbox 3-24 h | Yes / Yes | Not documented | JavaScript/TypeScript, Go, CLI, MCP server, gRPC/Connect API |
| Runtime | Firecracker microVM | No | No / No | Not documented | No limit documented | Yes / Yes | Not documented | JavaScript/TypeScript, Python, Go, Ruby, Java, CLI, REST API, MCP server |
| Superserve | Firecracker microVM | No | No / Yes | Not documented | Unlimited | Yes / Yes | Not documented | Python, JavaScript/TypeScript, CLI, REST API, MCP server |
Frequently asked questions
What are the main alternatives to Tenki Sandbox?
Is there an open-source alternative to Tenki Sandbox?
Cite this page
Agent Sandboxes. (2026). Tenki Sandbox alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/tenki-sandbox/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.