Privacy-First, Even on the Web. How Msty Studio Web Keeps Your Data Local with OPFS

We at Msty view data privacy as a fundamental principle, not an afterthought. That’s why Msty Studio Web brings all the power of Msty Studio directly into your browser without compromising your data privacy.

Even though Msty Studio Web is a hosted web app, your conversations, settings, and preferences never leave your device.

This can be a difficult concept to grasp, especially since most web applications rely on cloud storage to function and that has been the norm for years. But, thanks to OPFS (Origin Private File System), Msty Studio Web can securely store all your data locally on your device, in a similar way a desktop application would.

Here’s how that works and why it matters.

What Is OPFS?

OPFS (Origin Private File System) is a modern web standard that allows web apps to securely store data locally on your device and not on remote servers.

Unlike traditional web storage or cloud sync, OPFS gives web applications direct access to a file system within your browser.

This means data written to OPFS is:

• Private to your browser and device - no other websites or services can access it
• Persistent across sessions - your data stays saved even after you close the browser
• Completely isolated from the network - it’s never transmitted unless you explicitly share it

In short, OPFS lets Msty Studio Web act like a local app even though it runs in your browser. This is huge because it allows us to blend the convenience of a web app with the privacy of a desktop app.

What This Means for Msty Studio Web

When you use Msty Studio Web, Msty hosts only the application assets; meaning the UI, scripts, and features that make the Studio run.

However, your data stays fully local:

• All of your conversations, model configurations, and settings are securely stored via OPFS on your device
• Msty never receives, processes, or has access to your private data
• No one else, not even us, can access your Studio Web data, because it never leaves your browser

This architecture allows you to use Msty Studio Web with complete confidence that your work, chats, and model data remain entirely in your control.

Why This Matters

Traditionally with web applications, if you wanted privacy and control over your data, you’d need to self-host an app and manage your own servers, updates, and maintenance.

With OPFS and Msty Studio Web, that’s no longer necessary.

You get:

• ✅ Full privacy and data ownership as data stays on your device
• ✅ Zero maintenance since you don't need to host or manage servers
• ✅ Instant updates; when we ship improvements and new features, they are automatically available to you

This combination takes the “heavy lifting” out of running a secure, local-first AI workspace.

With AI tools becoming more prevalent, we hear from many organizations that they are looking for ways to leverage AI without exposing sensitive data to third-party servers. Msty Studio Web with OPFS is our answer to that need without organizations having to incur the overhead and complexity of self-hosting.

Privacy-First by Design

At Msty, our privacy-first commitment means we design every product so that your data remains yours.

We believe privacy shouldn’t require tradeoffs and with OPFS, it doesn’t. Msty Studio Web demonstrates that you can have the convenience of a hosted experience with the privacy of a local app.

Msty Studio Web brings the best of both worlds:

🌐 Hosted and always up to date

🔒 Private and locally stored data that's in your control, not ours or anyone elses

That’s the Msty way. Privacy-first, everywhere.