ashinno/wechat-multi

WeChat Multi is a small macOS menu bar app that lets you run several copies of WeChat side by side on the same Mac, so you can be signed in to a work account, a personal account, and any extras at the same time. The official WeChat for Mac is designed to allow only one running copy: if you try to open a second one, it quietly kills the new process. This app gets around that by making clones of the WeChat app bundle under your home Applications folder, each with its own bundle identifier. The technical trick is straightforward. For each new slot the app uses APFS copy-on-write to duplicate WeChat.app instantly, edits the clone's Info.plist to give it a fresh CFBundleIdentifier like com.wechatmulti.cloneN, removes the original Apple code signature, re-signs the bundle ad-hoc with codesign, clears the Gatekeeper quarantine attribute, and launches the clone. Because macOS sees each clone as a different app, it gives each one its own sandbox container, and WeChat's running-instance check no longer triggers. The downside is that ad-hoc signing breaks the keychain entitlements tied to Tencent's team ID, so you log in fresh in each clone, which is what you want for multiple accounts anyway. From the menu bar you can launch a new instance, rename a slot to something like Work or Personal, bring an instance to the front, quit one instance, or quit all of them. Each clone shows up with its own avatar dot colour. When the official WeChat updates, the app notices that the clones are out of date and offers to rebuild them, keeping the saved logins and chat history that live in the per-clone container folders. It is a universal binary that needs macOS 13 Ventura or later, weighs around 190 kilobytes, and has no third-party dependencies. You can grab a pre-built release or build it yourself with the included install script. The project is MIT licensed.