Your whole squad in the game
in a single click

RoStack opens several Roblox accounts at once in separate windows. Your main, your alt and your friends join the same server together — no logging out, no re-entering.

Download free See how it works
  • ✓ Works offline
  • ✓ No account limits
  • ✓ Passwords never leave your device
RoStack Launcher

Pick the accounts to launch

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Three steps

From install to a full lobby

No server setup, no complicated guides. Install it and play with your whole team.

01

Install the extension

Download the archive, unzip it and add RoStack to your browser in developer mode. It takes less than a minute.

02

Add your accounts

Sign in to your Roblox profiles once. RoStack saves the sessions locally and shows them in the panel.

03

Launch the game

Open any game, tick the accounts you want and hit "Launch". Each one opens in its own window.

Features

Built for real players

Everything you need to manage a team of accounts without wasting time.

Multi-launch

Up to 12 windows at once

Launch as many accounts as you like in independent windows. Each one joins the same server as the rest — perfect for raids, farming and recording.

Your passwords stay with you

Sessions are stored on your device only. No middleman servers, no data handoff.

Instant start

Switch between profiles with no logout and no re-login. One tap and you're in the game.

Any browser

Chrome, Edge, Brave, Arc, Opera, Vivaldi — it works everywhere Chromium runs.

Presets

Save your team line-ups

Group accounts into a preset and launch the whole set with one button. Morning farm, evening raid, recording crew — all a click away.

Reviews

What the community says

★★★★★
I used to juggle two browsers and kept mixing things up. Now the whole line-up joins with one button — saves me tons of time farming.
P PixelPunchgrinder
★★★★★
I record videos for my channel: multiple windows in one server is the base. RoStack just works and never lags.
V VoxelVibecontent creator
★★★★★
Loved that passwords never leave my machine. Set it up in a minute and my accounts loaded themselves. Highly recommend.
K KittyBloxxstreamer
Common questions

Answered briefly

How do I install the extension?

It's easy, even if you've never installed an extension before. Just follow these steps:

  1. Download the RoStack archive from the button on this page and save it somewhere you'll remember, like your Desktop.
  2. Unzip it. Right-click the downloaded .zip file and choose "Extract all" (Windows) or double-click it (Mac). You'll get a folder named rostack.
  3. Open your browser's extensions page. In Chrome, Edge or Brave, type chrome://extensions in the address bar and press Enter.
  4. Turn on "Developer mode." Flip the switch in the top-right corner of that page.
  5. Click "Load unpacked" and select the rostack folder you unzipped earlier.
  6. You're done! The RoStack icon appears in your toolbar. Click it, add your accounts, and start playing.
Which browsers are supported?

Any Chromium-based browser: Chrome, Edge, Brave, Arc, Opera and Vivaldi. A dedicated Firefox version is in the works.

How many accounts can I launch?

The extension sets no limit. The practical ceiling depends on your computer's power — usually up to 12 windows run comfortably at once.

Is it safe for my account?

Yes. RoStack never stores or sends passwords to third-party servers — sessions stay in your browser only. We don't automate gameplay and we don't break fair-play rules.

Is RoStack affiliated with Roblox?

No. It's an independent tool, not affiliated with Roblox Corporation. "Roblox" is a trademark of its respective owner.

Build your squad
today

Free, no sign-up and no subscriptions. Setup takes less than a minute.

Download RoStack Watch the guide

~2 MB · Chromium · last updated July 3, 2026