Inspiration
I'm a CS student with many accounts I use every day—Facebook, Instagram, X, YouTube, etc. With the boom of AI products, I also want to try them out, but many only have web versions. For example, when NotebookLM first launched, there was no mobile app, so I had to painfully open Safari, log in again, and repeat the whole process whenever I wanted to access my content. It was frustrating. I realized: since they are all web-based, we can reuse cookies and localStorage to re-incarnate sessions. The missing piece was keeping sessions seamless across devices. That’s why I built Zentab – Multi Web Account Manager.
What it does
Zentab is a platform that helps you manage your web account sessions. It includes an iOS app, an Android app, and a Chrome Extension for desktop. With Zentab, you can quickly import web sessions from your favorite desktop browser into the Zentab mobile app—no more re-signing in again and again.
One of the coolest features is secure session sharing. You can share access to your account with others without leaking your email and password. With Zentab, you can give access, revoke it anytime, and keep full control.
Challenges we ran into
The biggest challenge we faced was handling security. Web sessions are highly sensitive, and transferring them between devices is risky if not done right. To solve this, we gave users full control over how their data is stored. Zentab supports two modes: a local-only mode, where everything stays on-device with no cross-platform syncing, and a bring-your-own-storage mode, where users can connect their own S3-compatible storage to manage syncing independently. This flexibility ensures that Zentab works for both users who prioritize maximum privacy and those who want the convenience of seamless multi-device access.
What's next for Zentab - Multi-Account Command Center
Next, we want to expand Zentab into a true command center for web accounts. That means extending support to more browsers like Safari and Firefox, improving how teams and families can share access safely, and exploring automation features to make switching between profiles even faster. Beyond that, we see Zentab as a foundation layer for authentication for AI Agents. As personal and workplace agents increasingly need to act on behalf of users—whether it’s posting to social media, managing content, or pulling data—Zentab can provide the secure, revocable session infrastructure they rely on. In the long run, we aim to make Zentab not just a multi-account manager, but the identity infrastructure for the web and AI-driven future, where apps, people, and agents can interact seamlessly without ever giving up security or control.
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