Sandboxer vs Browserbase

Browserbase is a hosted headless-browser platform for agents, with the Stagehand SDK, Functions and observability. Sandboxer is a different category: each sandbox is a full Ubuntu VM with root, Docker and nested KVM, not a browser instance. Pick Browserbase for web agents; pick Sandboxer for full VMs.

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

At a glance

Sandboxer and Browserbase compared
Capability	Sandboxer	Browserbase
Isolation	microVM Cloud Hypervisor, its own kernel	browser instance Described as isolated sessions; mechanism not documented
Full Linux with root	Ubuntu 24.04, sudo, systemd	Not offered; the product is a remote browser driven over CDP/API, not a general machine
Docker inside	Preinstalled	Not offered; the product is a remote browser driven over CDP/API, not a general machine
Nested virtualization (/dev/kvm)		Not offered; the product is a remote browser driven over CDP/API, not a general machine
Pause and resume with memory	Running processes come back
Fork a sandbox	Copy-on-write disk copy that boots fresh	No VM fork; browser sessions only
HTTPS URL per port	Private with a token, or public	Not offered; the product is a remote browser driven over CDP/API, not a general machine
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	15 min on Free; other plans not listed
Billing	Per second, flat rate per size Stopped sandboxes are free	browser hours included per plan, then overage Developer $20/mo (100 h, $0.12/h over); Startup $99/mo (500 h, $0.10/h over); proxies $12/$10 per GB
GPUs		No GPU machines described; browser sessions only
Self-host or open source
Regions	US East (Virginia) and EU Central (Finland)	US East, US West, EU Central, UK Asia Pacific on request for enterprise

= not documented publicly.

Where Browserbase is strong

Stagehand SDK with act, extract and observe primitives.
Session logs, live view and replay for each agent step.
Four regions including EU and UK.
Partnerships for agent identity with Cloudflare and Fingerprint.

Where Sandboxer differs

Browserbase provides browsers, not VMs with root, Docker or KVM.
Free sessions end after 15 minutes; Sandboxer paid plans have no time limit.
Browserbase offers consulting for on-prem or hybrid deployments on request; Sandboxer is not self-hostable.

Pick Browserbase if

You build web agents and want Stagehand and session replay.
You need EU or UK browser regions.
You need stealth and agent-identity features on protected sites.

Pick Sandboxer if

You need a full Ubuntu 24.04 VM with root, systemd, Docker and nested KVM rather than a browser only.
You want stop/resume that brings running processes back, and sandboxes that cost nothing while stopped.
You want coding agents (Claude Code, Codex and others) preinstalled and any port exposed as an HTTPS URL.

Sources

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

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