Sandboxer vs Azure Container Apps

Azure Container Apps runs containerized apps and jobs serverlessly and scales to zero. Its dynamic sessions add Hyper-V-isolated, pooled sandboxes for running untrusted code. They are container-based and ephemeral, not full VMs. Choose it inside Azure; choose Sandboxer for full machines.

Checked against Azure Container Apps' public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Azure Container Apps compared
Capability	Sandboxer	Azure Container Apps
Isolation	microVM Cloud Hypervisor, its own kernel	Hyper-V isolation (dynamic sessions); containers for apps
Full Linux with root	Ubuntu 24.04, sudo, systemd	partial Custom container sessions let you bring your own image; machine-level root not documented.
Docker inside	Preinstalled	partial Runs your container image; no Docker daemon inside.
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back
Fork a sandbox	Copy-on-write disk copy that boots fresh
HTTPS URL per port	Private with a token, or public	partial HTTPS or TCP ingress for apps; sessions are reached via a pool endpoint with an identifier.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	cooldown-based, session destroyed after inactivity Sessions are short-lived; configurable cooldown.
Billing	Per second, flat rate per size Stopped sandboxes are free	per second vCPU and GiB on Consumption; code-interpreter sessions per hour Free monthly grant: 180,000 vCPU-s, 360,000 GiB-s, 2M requests.
GPUs		Serverless GPU (T4, A100) and dedicated GPU profiles.
Self-host or open source
Regions	US East (Virginia) and EU Central (Finland)	Dynamic sessions in about 40 Azure regions

= not documented publicly.

Where Azure Container Apps is strong

Scale to zero with per-second Consumption billing and a monthly free grant.
Pre-warmed session pools allocate sandboxes in milliseconds.
Serverless GPUs and deep integration with Azure networking and identity.

Where Sandboxer differs

Sessions are ephemeral containers, not persistent full VMs with root and systemd.
No documented pause that keeps memory and processes, and no fork.
Code-interpreter sessions are limited to built-in runtimes.

Pick Azure Container Apps if

You deploy containerized services or jobs on Azure and want scale to zero.
You need pooled, quickly allocated sandboxes for LLM-generated code inside Azure.

Pick Sandboxer if

You want a full Ubuntu 24.04 VM with root, Docker and nested KVM that stops and resumes with running processes intact.
You want coding agents (Claude Code, Codex and others) preinstalled and driven through a prompt API, MCP, REST, CLI and SDKs.
You want per-second billing and stopped sandboxes that cost nothing.

Sources

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

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