Sandboxer vs Blaxel

Blaxel is a sandbox platform for AI agents built around fast standby and resume, with memory state and processes kept across scale-down. It differs from Sandboxer mainly in latency focus and a RAM-based billing model, while Sandboxer is a full Ubuntu VM with Docker, nested KVM and preinstalled coding agents. Pick Blaxel for very fast resume and multi-region placement; pick Sandboxer for a general-purpose VM.

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

At a glance

Sandboxer and Blaxel compared
Capability	Sandboxer	Blaxel
Isolation	microVM Cloud Hypervisor, its own kernel	microVM (hypervisor not named) Docs describe lightweight sandboxed virtual machines; pricing page says hardware-isolated microVM.
Full Linux with root	Ubuntu 24.04, sudo, systemd
Docker inside	Preinstalled
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back	Standby resumes in under 25 ms with memory state and running processes kept; external connections not preserved.
Fork a sandbox	Copy-on-write disk copy that boots fresh	partial Snapshots can be forked into other sandboxes; archives cannot be forked.
HTTPS URL per port	Private with a token, or public	Preview URLs open ports dynamically; ports 80, 443 and 8080 are reserved.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	no fixed limit stated Starter quotas enforce TTLs; higher tiers allow unlimited persistence.
Billing	Per second, flat rate per size Stopped sandboxes are free	per second, active RAM-based $0.0000115 per GB of RAM per second; CPU scales with memory; standby not billed as active; snapshot storage $0.20/GB-month.
GPUs
Self-host or open source		partial Pricing page lists private networking and bring-your-own-metal options.
Regions	US East (Virginia) and EU Central (Finland)	4 listed: Oregon, N. Virginia, London, Frankfurt Some regions need contacting Blaxel.

= not documented publicly.

Price for one 4 vCPU, 8 GB machine

Sandboxer

$0.036/hour

Flat per-second rate for the default size

Blaxel

$0.33/hour

8 GB × $0.0000115/GB-s × 3600 (CPU scales with memory, no separate vCPU rate; 4 vCPU not separately priced)

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

Where Blaxel is strong

Memory state and running processes are kept across standby, with resume under 25 ms.
Preview URLs for ports are built in.
Four regions and private networking or bring-your-own-metal options.
Standby time is not billed as active compute.

Where Sandboxer differs

Blaxel bills by RAM and scales CPU automatically, while Sandboxer prices fixed sizes by the hour.
Blaxel docs do not state root access, Docker or nested virtualization, which Sandboxer provides.
Starter quotas set TTLs, while Sandboxer paid plans allow no time limit.

Pick Blaxel if

You need sub-100 ms resume from standby.
You want a choice of regions in the US and Europe.
You want to run on your own metal.

Pick Sandboxer if

Your workload needs a full Ubuntu VM with systemd, Docker preinstalled and nested KVM.
You want coding agents (Claude Code, Codex, OpenCode, Pi, Kimi Code, Mistral Vibe) preinstalled and driven through a prompt API.
You want stop/resume that keeps memory and running processes, with sessions that can run with no time limit on a paid plan.

Sources

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

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