iOS/Android: There's certainly no shortage of apps that promise to let you send secure texts, photos, and more and then delete them from the recipient's phone later, but Wiper is one of the first to do that and add in encrypted voice calls. It's free, and you can control when the messages you've sent get erased.
Wiper is a bit like other "ephemeral" and "secure" messaging apps, but it gives you more control over when messages send and when they're deleted. Most apps delete the messages a set time after they're read, but Wiper lets you remove them at any time. On Android, the app also offers screenshot protection, and notifies you if the recipient tries to screenshot, download, or forward your message, photo or video. (It won't stop someone from taking a photo of their screen or screenshotting in flight mode, but then nothing will.)
The app also allows you to place encrypted voice calls via Wi-Fi or mobile data to other people using the app, and share YouTube videos, music or other files with other Wiper users, all encrypted of course. When I asked about the kind of encryption Wiper was using, the team behind it was pretty cagey — they didn't want to talk about how secure the app was or what type of encryption they used, but they promised that it was on par or better than other so-called "secure messaging" apps available. Either way, it's not on the EFF's rundown of secure apps yet, but we hope they get to it soon.
In the meantime, if you're interested in trying it out, it's completely free and available now. Hit the links below to give it a whirl.