I know, it's not a good one. But at least we made it lol ~ neon-nyan

GI Nahida Background Credit: Rafa on Pixiv

Collapse was originally designed for Honkai Impact 3rd. However, as the project evolved, this launcher is now a game client for all currently released miHoYo Games and even external games through its plugin system!

Why "Collapse"?

Collapse came from the Honkai Impact translation in Chinese and Japanese. The word came from [崩坏] or Bēng huài in Chinese and also [崩壊] or Houkai in Japanese, both meaning "Collapse" which is why we chose it as our launcher name with the added inspiration that this was supposed to be an alternative (enhanced) launcher for Honkai Impact 3rd in the first place.

Collapse contains advanced features for Honkai Impact 3rd that not only provide you with the ability to download and launch the game, but also some additional features that the Official Launcher doesn't have, including:

Caches Download (aka "Updating Settings" in-game).
Game Data Repair (with less bandwidth required than the Data Repair feature in-game).
Changing Game Settings (Graphics Settings & Audio Settings) without opening the game.
Multi-Region Game Download Support (Allows for downloading and launching different versions of the game).
Steam to Global version conversion (without re-downloading the whole game).
Global to SEA version (or vice versa) conversion.
Multi-session Download for faster Game Download/Installation.
Multi-thread Game Extraction for faster installation.
Delta-Patch Update Mechanism for smaller updates (Click here for more info).
Ability to select Graphics API (DirectX 11 (FL: 10.1, 11.0 and 11.1) and DirectX 12 [May crash the game in newer stages]).

Not only that, this launcher also has some advanced features for Genshin Impact, including but not limited to:

Choosing your voice-line language during the first installation, so you don't have to download it inside the game.
Repair the game files including Game Caches, Cutscenes, Audio Pack & persistent files outside of the game.

Supported Features

You can find the list of features on our new website!

Download Ready-To-Use Builds

Note: The version for this build is 1.84.4 (Released on: June 21st, 2026).

To view all releases, click here.

System Requirements for Ready-to-use build

OS: Windows 10 1809 Update (build 17763) or later / Windows 11 (Any builds)
Architecture: x64/AMD64
Internet Access: Yes

Prerequisites for Building Locally/Development

More information can be found in Contribution Guidelines

Code Signing Policy

Free code signing provided by SignPath.io, certificate by SignPath Foundation

This program will only transfer user data to user configured database server. Exception data will be sent to Sentry.io for error tracking purposes (user are able to disable the behavior in App Settings).
Read our full Privacy Policy
Also read our Third Party Notices for license used by third party libraries that we use.

Third-party repositories and libraries used in this project

Disclaimer: This project IS NOT AFFILIATED with miHoYo (miHoYo Co., Ltd.) or HoYoverse (COGNOSPHERE PTE. LTD.) by any means and is completely open-sourced. Any contributions are welcomed! 😃

Windows UI Library by Microsoft under MIT License
Windows App SDK by Microsoft under MIT License
SharpHDiffPatch by neon-nyan (original port of HPatchZ by housisong) under MIT License
Color Thief .NET by KSemenenko and forked by neon-nyan under MIT License
SevenZipExtractor by Alexander Selishchev (adoconnection) and forked by neon-nyan under MIT License
Hi3Helper.Http by neon-nyan under MIT License
Hi3Helper.EncTool by neon-nyan
Hi3Helper.SharpDiscordRPC from discord-rpc-csharp by Lachee and forked by Collapse Project Team under MIT License
Hi3Helper.Sophon by neon-nyan under MIT License
Hi3Helper.ZstdNet by skbkontur and forked by neon-nyan under BSD-3-Clause License
InnoSetupLogParser from isulr by preseverence and forked by neon-nyan under WTFPL License
Google Protobuf by Google LLC under BSD-3-Clause License
Clowd.Squirrel by clowd under MIT License
Windows Community Toolkit by Microsoft under MIT License
GitInfo by Daniel Cazzulino (devlooped) under MIT License
H.NotifyIcon by Konstantin S. (HavenDV) under MIT License
HTML Agility Pack by zzzproject under MIT License
RomanNumerals by Pascal Craponne (picrap) under MIT License
TaskScheduler by David Hall (dahall) under MIT License
SharpCompress by Adam Hathcock (adamhathcock) under MIT License
UABT by unknown

UI Design Overview

How can I support this project?

Supporting is never an obligation but is always appreciated and motivates us to invest more time in the project and to keep this and other projects alive. To this end, should you decide to support us, here are ways you can do so 😄:

GitHub Sponsors
PayPal

Made by all captains around the world with ❤️. Fight for all that is beautiful in this world!

Contributors

_{Kemal Setya Adhi} 💻 🎨 🧑‍🏫 🚧 👀 📆	_{Ron Friedman} 💻 🚧 👀 📆	_{Bagus Nur Listiyono} 💻 🚧 👀 📣 🚇 📆	_{Gabriel Lima} 💻 🌍	_Shatyuka 💻 🌍	_{Kylian Nicouleaud} 🌍 🐛	_misaka10843 🌍
_{Vermilion-Sinsha} 🌍	_{Pham Khanh Nhan} 🌍	_DeepChirp 🌍	_Faelayis 🌍	_Hasukay 🌍	_Kajitsy 📖 🌍	_despenser08 🌍
_seria 🌍	_{xTaiwanPingLord} 🌍	_Scald 💻	_{Iskandar Montano} 💻	_Scighost 🐛	_IhoFox 🌍	_puyomi 🌍
_Souta 🌍	_eden 🌍