How Anything Is Building a Vibe-Coding Empire with 1M+ Users

Over one million people use Anything to build apps without writing code. A user describes what they want to build, and the agent creates everything - from the frontend and backend to deployment and App Store submission.

What looks like a simple conversation hides a demanding AI workload in production. 

Getting from a prompt to a working app needs to feel immediate and magical for users. Behind this is a complete development environment that has to be provisioned, ready in seconds so the experience feels as immediate as chatting with an LLM.

The challenge: making every execution environment feel like a real developer workstation.

Agents need real tools

Generating code is easy. Getting it to execute like it would on a real developer machine is the hard part. Installing dependencies, starting development servers, compiling native mobile apps, launching browsers, and debugging code. The challenge is giving the agent an environment that feels like a developer's own computer, not just somewhere to execute code.

That means providing a complete development environment with a filesystem, native build toolchains, and browsers, so the agent can build, run, and test applications the same way a human developer would. 

If the execution environment can't support one of those workflows, the coding agent gets stuck, the user gets frustrated, and ultimately, they can't get the job done

- Marcus Lowe, CEO, Anything

Scaling for viral growth

Additionally, Anything's workload is unpredictable. A surge of users, whether from a product launch or a viral social media moment, can require thousands of sandboxes to spin up almost instantly.

The infrastructure has to scale just as quickly, provisioning thousands of isolated execution environments on demand so users can start building immediately without introducing noticeable latency, which directly affects the user experience.

“Our business is extremely high-volume... Oftentimes, the workload is quite spiky as well, so we need to be able to spin up thousands of sandboxes on a moment's notice if we happen to be going viral on social media.

- Marcus Lowe, CEO, Anything

The build vs buy decision

Anything considered building their own sandbox infrastructure, but decided against it after estimating it would take two to three senior engineers months to reach production, with no guarantee the resulting system would scale.

The solution: real computers for agents

E2B provides infrastructure that scales with Anything’s spiky workloads while keeping sandbox startup fast enough that users don't notice the infrastructure behind the scenes. E2B gives each user in an Anything session its own MicroVM: a lightweight virtual machine that behaves like a real Linux computer while providing strong isolation between users. That means Anything's agents don't need special-case tooling or restricted runtimes; they can use the same package managers, development servers, browsers, and build tools they would on a developer's laptop. 

"E2B is more or less like a true representation of a Linux box that a coding agent would expect to use whenever they were coding if they were working locally on your machine."

 - Marcus Lowe, CEO, Anything

Anything was able to integrate with E2B's SDK quickly, start sending their production traffic almost immediately, and validate that the execution layer could scale alongside the rest of the product.

Anything uses E2B Templates to give every new project a preconfigured starting environment. As each app evolves, the platform continuously creates updated templates containing the latest version of the user's code, so new sessions start from the current state instead of an outdated baseline. 

Anything also makes use of E2B snapshots to resume running development servers instantly, eliminating setup work between sessions. When users return to their project, the environment resumes instead of starting over. For interactive coding, eliminating repeated startup work makes the product feel substantially faster.

"I still don't understand how you guys do that. That part is really cool."

- Marcus Lowe, CEO, Anything

The result: built for consumer scale

Concurrency: Thousands of concurrent sandboxes

Scalability: Workloads for 1M+ unique users supported

Headcount savings: 2-3 senior infrastructure engineers over a few months

Scaling with Anything

Today, Anything runs thousands of E2B sandboxes in parallel, serving more than one million users. What started as a build-versus-buy decision has become core infrastructure for the product, allowing the team to focus on AI software engineering while relying on E2B to provide fast, isolated Linux environments at consumer scale. 

"As we grow beyond millions of users, we know and trust that E2B will continue to grow with us. As new users sign up, they'll always have a hot and ready sandbox with their code loaded in it ready to go."

- Marcus Lowe, CEO, Anything