Sandboxer vs LangSmith Sandboxes

LangSmith Sandboxes are managed isolated environments in the LangSmith platform, built for Deep Agents and LangChain workflows, with filesystem snapshots, authenticated service URLs and self-hosted deployment. Sandboxer is a general full-Ubuntu VM with memory-preserving stop/resume. Pick LangSmith if you already run on LangSmith.

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

At a glance

Sandboxer and LangSmith Sandboxes compared
Capability	Sandboxer	LangSmith Sandboxes
Isolation	microVM Cloud Hypervisor, its own kernel	Isolated sandbox environment (mechanism not stated)
Full Linux with root	Ubuntu 24.04, sudo, systemd	Not stated on the official pages checked.
Docker inside	Preinstalled	Not stated on the official pages checked.
Nested virtualization (/dev/kvm)		Not stated on the official pages checked.
Pause and resume with memory	Running processes come back	partial Stopped sandboxes wake on next use; snapshots are filesystem-only by default, with optional memory capture through the REST API only.
Fork a sandbox	Copy-on-write disk copy that boots fresh	partial Many sandboxes can be created from one snapshot; processes do not carry over by default.
HTTPS URL per port	Private with a token, or public	partial Authenticated service URLs for HTTP services; the CLI can tunnel TCP ports.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	not stated; idle stop after 10 minutes by default (configurable) Stopped sandboxes are deleted after about 14 days by default (max 30).
Billing	Per second, flat rate per size Stopped sandboxes are free	per second, vCPU + memory + storage 0.0576 per vCPU-hour, 0.01845 per GiB-hour, 0.000123 per GiB-hour storage, in LSUs (1 LSU = $1).
GPUs		Not stated on the official pages checked.
Self-host or open source		Self-hosted deployments and BYOC are documented.
Regions	US East (Virginia) and EU Central (Finland)	GCP US, EU and APAC; AWS US; BYOC

= not documented publicly.

Price for one 4 vCPU, 8 GB machine

Sandboxer

$0.036/hour

Flat per-second rate for the default size

LangSmith Sandboxes

$0.38/hour

4 vCPU × $0.0576/h + 8 GiB × $0.01845/h (storage at $0.000123/GiB-h excluded; 1 LSU = $1)

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

Where LangSmith Sandboxes is strong

Native fit with Deep Agents and the LangSmith platform; mounts for S3, GCS and Git repos.
Multiple regions (GCP US/EU/APAC, AWS US) and self-hosted/BYOC options.
Auth proxy and restricted egress by default for non-Enterprise orgs.
Per-second metering of vCPU, memory and storage, with a free allowance of 8 LSU of Sandbox usage per month.

Where Sandboxer differs

LangSmith snapshots omit memory by default (memory capture is REST API only); Sandboxer stop/resume keeps running processes.
LangSmith pricing lists a 10-sandbox limit on the Developer plan.
LangSmith is self-hostable; Sandboxer is not.
Docker, nested KVM and root are not documented for LangSmith sandboxes.

Pick LangSmith Sandboxes if

You already use LangSmith or Deep Agents and want sandboxes in the same platform.
You need regions in the EU or APAC or a self-hosted deployment.
You want sandbox access controls tied to LangSmith permissions.

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. LangSmith Sandboxes is a trademark of its owner. Sandboxer is an independent product and is not affiliated with LangSmith Sandboxes.

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