Sandboxer vs Tenki Sandbox

Tenki Sandbox gives agents full Linux VMs with their own kernel, root, Docker, pause that keeps memory, and forking from checkpoints. It is the closest in design to Sandboxer; differences are pricing structure, size caps by plan, and Sandboxer's preinstalled coding agents and nested KVM. Pick Tenki for larger VMs on its Team plan; pick Sandboxer for flat plans and preinstalled agents.

Checked against Tenki Sandbox's public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Tenki Sandbox compared
Capability	Sandboxer	Tenki Sandbox
Isolation	microVM Cloud Hypervisor, its own kernel	full VM with its own kernel Hardware-isolated VM, not a shared-kernel container.
Full Linux with root	Ubuntu 24.04, sudo, systemd	Agents can work with root access inside the VM.
Docker inside	Preinstalled	Full VM sandboxes support Docker, system packages and background services.
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back	Pausing preserves memory and durable files; active connections close and /tmp is cleared.
Fork a sandbox	Copy-on-write disk copy that boots fresh	Snapshot disk and memory, then fork sessions from a checkpoint.
HTTPS URL per port	Private with a token, or public	Expose a port to get a preview URL; Starter and Team workspaces allow 20 preview URLs. Privacy settings not stated.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	no fixed value stated Non-sticky sessions pause automatically when they reach their maximum duration.
Billing	Per second, flat rate per size Stopped sandboxes are free	per second: CPU, memory, disk First 5 GiB of disk free.
GPUs
Self-host or open source
Regions	US East (Virginia) and EU Central (Finland)

= not documented publicly.

Price for one 4 vCPU, 8 GB machine

Sandboxer

$0.036/hour

Flat per-second rate for the default size

Tenki Sandbox

$0.33/hour

4 cores × $0.0504/core-h + 8 GiB × $0.0162/GiB-h (first 5 GiB disk free)

List prices from each provider's pricing page, before free credits, plans and storage. This compares price only.

Where Tenki Sandbox is strong

Full Linux VM with root and Docker, and pause that preserves memory.
Fork sessions from a disk-and-memory checkpoint.
Per-second billing with Team VMs up to 16 cores and 64 GB RAM.
TypeScript, Go and Python SDKs and a CLI.

Where Sandboxer differs

Tenki Starter VMs top out at 4 cores and 8 GB and 5 active sessions; Team allows 16 cores, 64 GB and 100 sessions at $200 to $250 a month.
Tenki bills CPU, memory and disk as separate usage rates after credits; Sandboxer plans return every plan dollar as machine time.
Sandboxer ships coding agents (Claude Code, Codex, OpenCode and more) in every sandbox with a prompt API; Tenki lets you bring your own agent.
Nested virtualization is not documented for Tenki; Sandboxer provides /dev/kvm.

Pick Tenki Sandbox if

You need VMs larger than 16 vCPU / 32 GB (Tenki Team goes to 16 cores and 64 GB).
You want a plan with up to 100 concurrent sessions at a flat monthly fee plus usage.
You want to bring your own agent via SDK or CLI.

Pick Sandboxer if

You want coding agents preinstalled and driven through a prompt API.
You need nested KVM and systemd in a full Ubuntu 24.04 VM.
You want plans that convert every dollar into machine time and a 7-day trial.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. Tenki Sandbox is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Tenki Sandbox.

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