Is Petit Planet free? Cross-platform and cross-save explained

Yes — Petit Planet is a free download on every platform (PC via Epic Games Store or a direct client, iOS, Android), with optional in-app purchases in the miHoYo style.

Cross-platform: the official announcements confirm the game runs on PC, iOS and Android with cross-platform account sync — your planet and progress follow your account between devices. The official launch notices will spell out the finer details (friend cross-play sessions, etc.), and we will update this page as they land.

MiHoYo accounts are shared across the publisher’s titles, so if you already play a miHoYo / HoYoverse game you will use the same account system. For the countdown and platform notes, see the tools page.