Open an app macOS blocked as 'unidentified developer' (the right way) — via Apple Support

Hidden settingmedium riskmacOS 14 Sonoma and later

Gatekeeper blocks apps that aren't from the App Store or a verified developer. If you trust the app (say, a small open-source tool), you don't need to switch Gatekeeper off. Approve that one app in Privacy & Security and macOS remembers it.

Takes effect right away

How to do it

  1. Try to open the app once and dismiss the warning.
  2. Open System Settings > Privacy & Security and scroll down to the Security section.
  3. Click Open Anyway next to the message about the app, then click Open in the next warning. After that it opens normally.
Only do this for software from a source you trust. Apps macOS says 'will damage your computer' or are damaged are a different case and shouldn't be forced open. Avoid guides that tell you to turn Gatekeeper off completely.

Sources

Source reviewed
2026-11-02
Link checked
2026-11-02
Tested hands-on
Not by Oddbyte.Me

Oddbyte.Me hasn't tried this on every macOS version, so keep the undo handy.

gatekeeperunidentified developeropen anywaycan't open appsecurity

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Turn on FileVault so a stolen Mac can't be read — via Apple Support

Hidden settingmedium riskAdmin

On Apple silicon and T2 Macs the disk is always encrypted, but without FileVault it isn't tied to your password. Turning FileVault on means nobody can get at your files without your login password or recovery key. On older Intel Macs without a T2 chip it's the only disk encryption.