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E2B SandboxOpen-source secure sandboxes for running AI-generated code at scale.

4.5 (6)
Daniel NikulshynReviewed by Daniel Nikulshyn·Updated July 2026
Open SourceDeveloper ToolsCloud InfrastructureAI AgentsCode ExecutionSDKSelf-Hostable

Overview

E2B Sandbox is an open-source infrastructure layer that lets developers safely execute AI-generated code in isolated cloud environments. It provides ephemeral virtual machines where agents and LLM-powered apps can run scripts, install packages, handle files, and interact with the web without putting host systems at risk. Built for AI engineers, E2B exposes simple SDKs in Python and JavaScript that spin up sandboxes in milliseconds. It is commonly used to power code interpreters, autonomous agents, data analysis workflows, and any application where untrusted or generated code needs a controlled runtime. Because the project is open source, teams can self-host the infrastructure or use the managed cloud, giving flexibility for compliance, customization, and cost control.

Key features

  • Secure isolated cloud sandboxes
  • Python and JavaScript SDKs
  • Filesystem and process control APIs
  • Long-running session support
  • Self-hostable open-source stack
  • Integration with popular LLM frameworks

Pricing

Model
Freemium
Category
Sandboxes
Rating
4.5 / 5 (6)

Use cases

Power LLM code interpreters

Run AI-generated Python or JavaScript code in isolated sandboxes to safely back ChatGPT-style code interpreter features within your own application.

Execute autonomous agent actions

Give AI agents a secure runtime to install packages, manipulate files, and execute multi-step scripts without compromising the host environment.

On-demand data analysis workflows

Spin up ephemeral VMs to let LLMs process datasets, generate charts, and run analytical scripts in a controlled, reproducible environment.

Self-hosted sandbox infrastructure

Deploy E2B's open-source stack in-house to meet compliance or cost requirements while still enabling secure execution of untrusted AI code.

Pros & Cons

Pros

  • Open source with self-hosting option
  • Fast sandbox startup times
  • SDKs for Python and JavaScript
  • Strong isolation for untrusted code
  • Designed specifically for AI agent workloads

Cons

  • Requires developer setup and coding knowledge
  • Managed cloud usage incurs costs at scale
  • Limited GUI tooling for non-technical users
  • Ecosystem still maturing compared to legacy compute platforms

Reviews

4.5

Average from 6 ratings.

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JK

Joanna Kowalski

Apr 28, 2026

Years in this space

I've evaluated a lot of these over the years. What stands out here is self-hostable open-source stack — handled better than most — and designed specifically for AI agent workloads. Managed cloud usage incurs costs at scale is my one real gripe. Worth the time if this is your use case.

Daniel Schmidt

Daniel Schmidt

Feb 8, 2026

Skeptical, then convinced

I went in skeptical — most tools in this space overpromise. It actually delivers on python and JavaScript SDKs, and sDKs for Python and JavaScript caught me off guard. Requires developer setup and coding knowledge is why this isn't a perfect score, still, I'd recommend giving it a real trial.

Frank Müller

Frank Müller

Sep 5, 2025

Skeptical, then convinced

I went in skeptical — most tools in this space overpromise. It actually delivers on filesystem and process control APIs, and sDKs for Python and JavaScript caught me off guard. Managed cloud usage incurs costs at scale is why this isn't a perfect score, still, I'd recommend giving it a real trial.

Mei-Ling Wong

Mei-Ling Wong

Aug 2, 2025

Does the job

Pretty happy overall. Filesystem and process control APIs just works and strong isolation for untrusted code. Requires developer setup and coding knowledge can be annoying, but no dealbreakers — I'd recommend it to a friend without hesitating.

SG

Sanjay Gupta

Jul 1, 2025

Years in this space

I've evaluated a lot of these over the years. What stands out here is long-running session support — handled better than most — and fast sandbox startup times. Worth the time if this is your use case.

HT

Hiroshi Tanaka

Jun 8, 2025

Compared a few options

Evaluated this against two competitors. Where it wins: filesystem and process control APIs and sDKs for Python and JavaScript. Where it lags: ecosystem still maturing compared to legacy compute platforms. On balance the feature set — especially integration with popular LLM frameworks — justifies the 5 stars for our use case.

Q&A

How is a mid-cycle purchase billed?

The dashboard shows the exact amount you will be charged before you confirm the purchase.

Asked by Valentina Marino · Sep 29, 2025

Can I scale the add-ons back down later?

Yes. Add-ons are billed monthly and are non-refundable, but you can remove one to stop future charges, so you are not locked in beyond the current billing period.

Asked by Hasan Demir · Sep 17, 2025

Does the increase take effect immediately?

Yes. The higher limit applies as soon as you purchase the add-on, with no provisioning delay.

Asked by Rosalind Frost · Sep 9, 2025

What's the per-unit pricing?

$500/month per add-on (500 slots), charged on top of your usage bill.

Asked by Hiroshi Tanaka · Aug 28, 2025

How much concurrency does each add-on add, and what's the self-serve maximum?

Each add-on adds 500 concurrent sandbox slots. On the Pro tier, you can scale this way up to 1,100 concurrent sandboxes. To go higher, you need an Enterprise plan.

Asked by Sofia Lindqvist · Jun 24, 2025

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