Open any app as if it were the first time.

Mezi creates isolated instances of any app. Use two Claude, ChatGPT or Discord accounts at the same time, without mixing logins, settings or cache.

Download for Windows See how it works

Mezi screen with Claude and Discord instances Mezi screen in dark mode
Features

Every instance is a world of its own

The app opens from scratch, with its own data folder. Your PC stays the same.

Separate logins

Each instance's accounts, settings and cache never mix with the others or with the regular app.

As many instances as you want

One for work, one for personal use, one for each client. Open, close and clear with one click.

Your folders, close at hand

Documents, Downloads and any project on your PC stay accessible — great for workspaces.

Microsoft Store apps

Works with regular programs and Store apps like Claude and ChatGPT. Just pick from the list.

Mezi browser

Login links from instances open in an isolated browser or in your usual browser. You choose.

Mezi Box (beta)

Mezi’s own sandbox: apps only write inside the instance, and Windows itself protects your files and the Registry.

  • 8 languages
  • Dark mode
  • Built-in tutorial
  • Mezi Box (beta)
  • Automatic updates
  • No ads
Who it’s for

Made for people who live with several accounts

Gamers

Main and alt on one PC: several Discords and gaming apps, each with its own login.

Learn more →

AI users

Claude, ChatGPT and other apps with one account per project, without mixing history.

Learn more →

Work

Freelancers, agencies and teams: each client in their own instance, with groups and PIN lock.

Learn more →
How it works

Three steps and you're done

  1. 1

    Choose the folder

    On first launch, tell Mezi where to keep your instances.

  2. 2

    Add an app

    Drag in an .exe, or pick a shortcut or an installed app.

  3. 3

    Click Open

    The app opens from scratch, ready for you to sign in to another account.

Plans

Free to use. Pro to go further.

The free plan already has everything for personal use. Pro removes the limits for people who manage lots of accounts, clients or teams.

Free

US$ 0

For personal use, no account needed

  • Up to 2 instances per app
  • Up to 5 apps
  • 1 open instance at a time
  • All of Mezi's features
Download for free
Pro

Pro

US$ 9,99/month

or save with the yearly plan

  • Unlimited instances
  • Unlimited apps
  • As many open instances at once as you want
  • Groups, templates, PIN lock and disposable instances
  • Priority support
Learn about Pro
Questions

Before you download

Which apps does it work with?

Windows programs and Microsoft Store apps — Claude, ChatGPT, Discord, VS Code, browsers and many more. Apps that only allow one open copy per PC, like Steam, may not open a second copy.

Where is my data stored?

In the Instancias folder you choose, on your own computer. Mezi doesn’t send your data to the internet. An account is optional and is only used for Pro and Mezi Box.

Do I need an account to use it?

No. Mezi works without an account on the free plan. You only need an account to use Mezi Box (beta) and to subscribe to Pro, which you can buy here on the website or inside the app, and cancel whenever you want.

Windows showed a warning during installation. Is that normal?

Yes. Newer programs that aren't digitally signed yet may show "Windows protected your PC". Click "More info" and then "Run anyway" to continue.

Ready to separate your accounts?

Download Mezi and create your first instance in under a minute.

Download Mezi