SnapMulti

Open 2–10 Snapchat accounts at the same time, each in its own browser session
Heads up: running several Snapchat accounts from one device, and score boosting, violate Snapchat's Terms of Service and can get accounts locked. Use only accounts you own and are allowed to run.
Setup & how it works
  1. Download the local launcher and unzip it on your PC.
  2. Run install.cmd once (double-click). This registers the snapmulti:// link handler.
  3. Add your accounts above, then press Open on each card.
  4. Each account launches in its own private browser profile, so logins don't kick each other out.
  5. Log into each window once — it stays signed in for next time.