E2B
Founded 2023 · 47 employees on LinkedIn · 9 known investors
E2B provides open-source, secure cloud sandboxes (built on Firecracker microVMs) where AI agents and LLMs can run untrusted, AI-generated code, use terminals and browsers, handle files, and access the internet. It is aimed at developers building AI agents, coding agents, data analysis tools, and reinforcement learning workflows, and offers self-hosted, on-prem, and BYOC deployment options.
Also known as e2b-dev · FoundryLabs, Inc.
Investors · 9
Also in the syndicate · 3
Funding
SEC filings, press & company announcements$42M disclosed across 2 of 3 rounds · 2025
- $21MSeries AJul 2025 · 3 sources
Insight Partners (lead), Decibel, Kaya, Scott Johnston, Sunflower Capital
Source ↗ - $21MraisedJul 2025 · 2 sourcesSource ↗
Source: company announcements and press reports — follow each round's link for the claim.
Company profile
researched Aug 2026E2B is an infrastructure company that supplies isolated cloud sandboxes in which AI agents and LLM applications can execute AI-generated code, process data, and operate tools. Its core primitives are the Sandbox, described as a fast, secure Linux virtual machine created on demand for an agent, and the Template, which defines the environment a sandbox starts with. Developers start and control sandboxes through JavaScript/TypeScript and Python SDKs, with additional SDKs for code interpretation (running code and returning results such as charts and files) and for Desktop, which adds a graphical Linux environment with mouse, keyboard, screenshot, application control, and desktop streaming APIs for computer-use agents.
The company positions its platform around agentic workloads including deep research agents, computer-use agents, automation and background agents, reinforcement learning and LLM training, AI data analysis and visualization, and secure MCP execution. Enterprise features described include isolation of untrusted LLM-generated code, SLAs, US and EU regions for data residency, role-based access control (listed as forthcoming), an observability dashboard, and BYOC or on-premises deployment; a self-hosting guide covers Terraform-based deployment on AWS and Google Cloud, with Azure and general Linux machines also listed. E2B also states plans for pluggable modules such as a secrets vault, sandbox observability, and shared context, and aims to make its open-source sandbox protocol a standardized interface across environments (Linux interpreters, Windows VMs, Chrome browsers) and infrastructures (Kubernetes, Google Cloud, Azure, AWS, Cloudflare, in-house VPCs).
Founding story
E2B was co-founded by Vasek Mlejnsky, who serves as CEO, and Tomas, who serves as CTO.
Business model
E2B sells cloud sandbox infrastructure to developers and enterprises, with a free tier to start, paid plans, and enterprise engagements that include BYOC/on-premises deployment, SLAs, and support. The core SDKs and infrastructure are open source under Apache-2.0 and can be self-hosted, while the managed E2B Cloud is the commercial offering.
Usage of the hosted sandbox platform via sign-up and paid plans, alongside enterprise agreements covering self-hosted, BYOC, and on-premises deployments with guaranteed uptime and support levels.
Traction
The company reports hundreds of millions of sandbox sessions supported since October of the year preceding its July 2025 Series A, more than one billion started sandboxes cumulatively, and millions of monthly SDK downloads. Named users and case studies include Perplexity, Hugging Face, Groq, Manus, Lindy, Genspark, LMArena, Rogo, Gumloop (serving enterprises such as Shopify and Instacart), and Anything. Open-source traction includes 13.6k stars on the main E2B repository, 6.4k on the Fragments template, 2.4k on Code Interpreter, 1.5k on Desktop, and 1.3k on the infra repository.
Latest developments
In July 2025 E2B announced a $21M Series A led by Insight Partners, bringing total funding to $32M, to expand its San Francisco teams and accelerate sandbox platform development. In October 2025 it published Build System 2.0. Its site markets an enterprise AI agent cloud with a startups program, a managed dashboard, and roadmap items including role-based access control, a secrets vault, sandbox observability, and shared context.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
E2B describes itself as an emerging open-source standard for agent sandboxes and states that 88% of Fortune 100 companies had signed up on its platform as of the Series A announcement, with its investor describing it as a leading provider of open-source cloud infrastructure designed for AI agents. Public traction indicators include over 13,000 GitHub stars on the main repository and claims of more than one billion started sandboxes.
E2B emphasizes an open-source architecture (Apache-2.0 SDKs, infrastructure, and dashboard) that customers can self-host or deploy in their own cloud or on premises, total isolation for untrusted LLM-generated code, fast sandbox start-up, and demonstrated scale to hundreds of millions of sandboxes. Customers cite integration in days rather than weeks compared with building sandbox infrastructure in-house.
Technology
Sandboxes are on-demand, isolated Linux VMs controlled through JavaScript/TypeScript and Python SDKs and a CLI; the infrastructure repository is written in Go and deployed with Terraform, and the organization maintains an archived fork of Firecracker microVMs. Additional components include the Code Interpreter SDK for running AI-generated code, the Desktop SDK for graphical computer use, a Next.js/React/Supabase dashboard for managing sandboxes and API keys, and templates defining sandbox environments.
Go-to-market
Bottom-up developer adoption through open-source repositories, SDKs on npm and PyPI, documentation, a cookbook of examples, and a Discord community, combined with an enterprise motion including sales calls, a GenAI blueprint consultation, published customer case studies, and a startups program.
Developers and companies building AI agents, coding and computer-use agents, data analysis and chatbot products, AI research labs running reinforcement learning and model training, and large enterprises requiring secure execution of LLM-generated code.
Geography
Headquartered in San Francisco, where the company hires in person and is expanding engineering, product, and go-to-market teams; the platform offers US and EU regions to support data residency requirements including the EU AI Act.
History
E2B began by making it easy for developers to add code interpreting to AI applications via its SDK and has expanded into a broader enterprise agent cloud covering code execution, desktop/computer use, reinforcement learning environments, and secure MCP hosting. Its blog record extends back to at least November 2023, and the company says it grew from a handful of early adopters to hundreds of millions of cloud sandboxes used at more than half of the Fortune 500 by the time of its 2025 Series A. The corporate entity behind the site is FoundryLabs, Inc.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 2
launches, deals, and filingsE2B announced a $21 million Series A led by Insight Partners with participation from Decibel, Sunflower Capital, and Kaya, plus angels including former Docker CEO Scott Johnston. The company stated the round brought total funding to $32M and would fund expansion of engineering, product, and go-to-market teams in San Francisco.
$21M source ↗
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
▸Research sources · 8
primary sources listed
- E2Be2b.dev · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does E2B do?
- E2B provides open-source, isolated cloud sandboxes where AI agents can securely run code and use computer-like tools.
- Who are E2B's investors?
- E2B's investors include Cortical Ventures, Decibel Partners, Deep Acre, KAYA, Operator Collective, Insight Partners.
- How much funding has E2B raised?
- E2B has disclosed $42M raised across 2 of its 3 known rounds.