osu! cannot be opened because the developer cannot be verified


Your Mac displays a warning saying one of either two messages:

  • “osu!.app” cannot be opened because the developer cannot be verified.

  • “osu!.app” can’t be opened because it is from an unidentified developer.


To directly quote Apple’s support article:

If you try to open an app that isn’t registered with Apple by an identified developer, you get a warning dialogue. This doesn’t necessarily mean that something’s wrong with the app. For example, some apps were written before developer ID registration began. However, the app has not been reviewed, and macOS can’t check whether the app has been modified or broken since it was released.


  1. Locate osu!.app in Finder

  2. Right-click (or hold the Control key while clicking) on osu!.app

  3. Click Open

On the dialog that reads:

“osu!.app” is an application downloaded from the Internet. Are you sure you want to open it?

Click Open.

If that didn’t work

There could be something else going on here, and performing basic troubleshooting should help you get to the bottom of it.

If you’re still not sure what’s going on here, copy any osu! crash logs and generate a report with osu!macOS Agent, then let us know on the forums with what we can help.