Right before Christmas, NSA whistleblower Edward Snowden launched a new app to turn an Android phone into an internet-connected alarm system that can help at-risk users guard or at least monitor against attackers trying to tamper with their computers or other devices while they’re left unattended.

The app, called Haven, garnered glowing media coverage from publications such as The Verge, The Intercept, and Wired, who wrote that the app “could protect its users from more than just hands-on computer hackers; it could guard against everyone from abusive spouses to authoritarian police.” The app’s goal is to give users a chance to find out about so-called “evil maid attacks,” a scenario where someone who has access to your house or hotel room can get their hands on your computer or cellphone and hack it.

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