Sandboxer vs Unikraft Cloud

Unikraft Cloud runs each instance as its own microVM built from a Dockerfile image, with scale-to-zero, millisecond resume, VM forking and checkpoints. It is an app and workload platform more than an interactive Linux box. Pick Unikraft for very fast, high-density, scale-to-zero services; pick Sandboxer for a full Ubuntu VM to log into.

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

At a glance

Sandboxer and Unikraft Cloud compared
Capability	Sandboxer	Unikraft Cloud
Isolation	microVM Cloud Hypervisor, its own kernel	microVM per instance (hardware-level isolation) Firecracker-based VMM; minimal Linux-based microVMs built from a Dockerfile.
Full Linux with root	Ubuntu 24.04, sudo, systemd	Not stated on the official pages checked.
Docker inside	Preinstalled	partial Dockerfile-based workloads run via a TinyX conversion; running a Docker daemon inside is not documented.
Nested virtualization (/dev/kvm)		Not stated on the official pages checked.
Pause and resume with memory	Running processes come back	Idle instances scale to zero and resume in milliseconds from a snapshot of app state.
Fork a sandbox	Copy-on-write disk copy that boots fresh	The site states forking a live VM and its children in about 10 ms; checkpoints can be rewound.
HTTPS URL per port	Private with a token, or public	Not stated on the official pages checked.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	Not stated on the official pages checked.
Billing	Per second, flat rate per size Stopped sandboxes are free	usage-based on active time; idle not billed Plans: Hobby free, Team $39/mo, Pro $199/mo, Enterprise custom; per-unit rates not seen.
GPUs		partial GPU support in enterprise preview.
Self-host or open source		partial Enterprise on-prem and BYOC; the platform itself is commercial (the unikernel project is open source separately).
Regions	US East (Virginia) and EU Central (Finland)	multiple metros (e.g. fra); list not seen

= not documented publicly.

Where Unikraft Cloud is strong

Scale-to-zero in under 10 ms with millisecond resume of stateful apps.
VM forking and checkpoint/rewind of running instances.
Hosted, dedicated hosted, BYOC and on-prem deployment options.
Hobby free tier; Team at $39/month.

Where Sandboxer differs

Unikraft runs minimal Linux-based microVM images built from a Dockerfile; interactive shell or SSH use is not documented, while Sandboxer is a full Ubuntu 24.04 VM with systemd and SSH.
Unikraft documents VM forks that preserve a live VM; Sandboxer forks boot fresh from a disk snapshot.
Unikraft lists GPUs only in enterprise preview and on-prem for Enterprise; Sandboxer has neither.
Per-unit rates were not available on the pages checked.

Pick Unikraft Cloud if

You run many small, bursty services and need near-instant scale-to-zero and resume.
You need on-prem or dedicated hosting.
You want a live-VM fork that preserves running state.

Pick Sandboxer if

Each Sandboxer sandbox is a full Ubuntu 24.04 VM with its own kernel, root/sudo, systemd and Docker preinstalled.
Stopping saves memory and disk and resume brings running processes back; stopped sandboxes cost nothing.
Coding agents (Claude Code, Codex, OpenCode and others) are preinstalled and driven through a prompt API, with an MCP server, REST API, CLI and TypeScript and Python SDKs.

Sources

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

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