Apps that stay private.

Petra is a messenger that protects your conversations with end-to-end encryption. We cannot read your messages. There are no ads, and we do not sell data.

You create a personal link and send it to someone you know. The link is valid for seven days and works exactly once. Whoever opens it and signs up is in. After that, the link is used up. You can create a new one at any time.

This way, you stay in control of the link. It cannot be found later, passed on to many people, or shared online for good. You decide who comes in.

No. Messages, files and voice messages are encrypted on your device. The server only sees that something arrives, who sent it and how big it is, but never the content.

It consists of twelve groups of numbers and is the same for each pair of people. Compare it, ideally in person or by phone call. If the numbers match, nobody is secretly reading along.

When you first start Petra, it shows you a recovery code. With it, you can read your chats on a new phone. Keep it safe. We cannot show or replace it.

Petra is funded by an affordable, optional subscription for extra features. Chatting and security stay free. The subscription pays for maintenance and new features. This is how we manage without ads and without selling data. Right now, everything is free.

Your account (name, username and, if you wish, your phone number), encrypted messages until they expire or are deleted, and your push registration. We do not use analytics or advertising tools.

For each chat, you can set a timer, for example from 30 seconds to one day. After that, the messages are deleted from the devices and from the server.

In Nuremberg, Germany, at Hetzner Online. The operator is a Dutch company in Amsterdam (see the imprint).

Open Settings and tap “Delete account” at the bottom. Your account, your key and your backup will be removed. This cannot be undone.

At getpetra.io/@dein-name, every person has a small page with their name, a description and, if they have one, the blue check. With the link, others go straight to your chat. To chat and to connect with you, they need a Petra account. The page does not show up in search engines. You can switch it off at any time under Settings, Privacy & security.

Names of brands, well-known people and inappropriate words are protected so that nobody can pose as someone else. Choose a different name. If the name really is yours, sign up with a different name and write to Support in the app. We will check it and release the name.

Open Settings, My stickers, create a pack and add images or GIFs. Images are cropped to a square automatically, GIFs can be up to 1 MB. In the chat, you send them with the sticker icon next to the text field. You can keep received stickers in your “Saved” pack with “Keep”. Your stickers are only stored on your device.

The server deletes documents such as PDFs and other files after 3 days, which saves space and data. If you want to keep a document, download it to your device beforehand. Photos, videos and voice messages are not affected.

Open Settings, Help & Info, Support and write to us there. We reply directly in the app.

Petra Shield is a vault for passwords, 2FA codes and API keys, as an app for iPhone and Android. The vault is encrypted with AES-256-GCM on your device and stays there. Available now via TestFlight for iPhone, soon on the App Store and Google Play.

No. Shield has no account and no Petra server. The vault lives on your device. With Pro, you can sync it across iPhone, iPad and Mac via iCloud, end-to-end encrypted. Android has no sync.

For 14 days, all features are free. After that you stay on Free with up to 3 entries, or choose Pro for €2.49 a month or €19.99 a year.

No. The vault is stored encrypted on your device. No Petra server sees your passwords.

Shield computes a SHA-1 hash of the password on your device and sends only its first 5 characters to Have I Been Pwned. What comes back is a list of all known hashes with that beginning. The comparison happens on your device.