Proton Mail: Encrypted Email

Proton AG

In-app purchases

About this app

Proton Mail's all-new encrypted email app protects your communications and has everything you need to easily manage your inbox.

The Wall Street Journal says:
“Proton Mail offers encrypted email, which makes it virtually impossible for anyone to read it except the sender and the recipient.”

With the all-new Proton Mail app, you can:
• Create a @proton.me or @protonmail.com email address
• Send and receive encrypted emails and attachments with ease
• Switch between multiple Proton Mail accounts
• Keep your inbox tidy and clean with folders, labels and simple swipe-gestures
• Receive new email notifications
• Send Password-protected Emails to anyone
• Enjoy your inbox in dark mode

Why use Proton Mail?
• Proton Mail is free — We believe everyone deserves privacy. Upgrade to a paid plan to get more done and support our mission.
• Easy to use — Our all-new app has been redesigned to make it easier to read, organize, and write your emails.
• Your inbox is yours — We don’t spy on your communications to show you targeted ads. Your inbox, your rules.
• Rigorous encryption — Your inbox is secured on all your devices. No one can read your emails but you. Proton is privacy, guaranteed by end-to-end and zero-access encryption.
• Unmatched protection — We offer strong phishing, spam, and spying/tracking protection.

Industry Leading Security Features
Messages are stored on Proton Mail servers using end-to-end encryption at all times and are transmitted securely between Proton servers and user devices. This largely eliminates the risk of message interception.

Zero Access to Your Email Content
Proton Mail's zero access architecture means that your data is encrypted in a way that makes it inaccessible to us. Data is encrypted on the client side using an encryption key that Proton does not have access to. This means we don't have the technical ability to decrypt your messages.

Open-Source Cryptography
Proton Mail's open-source software has been thoroughly vetted by security experts from around the world to ensure the highest levels of protection. Proton Mail only uses secure implementations of AES, RSA, along with OpenPGP, while all of the cryptographic libraries used are open source. By using open-source libraries, Proton Mail can guarantee that the encryption algorithms used do not have clandestinely built-in back doors.

Proton Easy Switch
Migrate from Gmail, Outlook, Yahoo, iCloud Mail or AOL to Proton Mail in just a few taps. Your messages, calendars and contacts are transferred automatically, so you’re up‑and‑running in moments—without any manual exporting or importing.

Gmail Auto‑forwarding
Enable auto‑forwarding from any number of Gmail accounts and funnel all the emails that matter into your Proton Mail inbox. Preserve Gmail’s convenience while adding an extra layer of privacy protection.

Proton Mail in the press:

“Proton Mail is an email system which uses end-to-end encryption, making it impossible for outside parties to monitor.” Forbes

“A new email service being developed by a group from MIT that met at CERN promises to bring secure, encrypted email to the masses and keep sensitive information away from prying eyes.” Huffington Post

Follow Proton on social media for all the latest news and offers:
Facebook: /proton
Twitter: @protonprivacy
Reddit: /protonmail
Instagram: /protonprivacy

For more information, visit: https://proton.me/mail
Our open-source code base: https://github.com/ProtonMail

Ratings and reviews

I've been using Proton Mail for a few years, but I'm considering dropping it. This app fails to show me all of my emails. After I open them in the browser, they become visible in the app. That's very annoying. Reliably receiving emails is the main job of an email app. Update 12/8/25 The app continues to fail to display all emails and there's no way to know what's missing without logging in using a browser. This has been happening for two months. I've informed support multiple times.

Proton Mail is great, but the mobile app is disappointing. It doesn't seem like the settings actually stick. Example: I've disabled the ability to group messages, yet I still get messages showing up in threads. I changed my signature on the desktop app but the mobile app kept using my old signature. Worst of all though, the unread emails count is unreliable, even after force closing and reopening. Emails also mysteriously reappear as unread days after reading. Frustrating!

First impressions are good in some ways bad in others. When I pull down to refresh, it just spins infinitely so I need to close the app and reopen it to get new messages. If I change any settings for folders, labels, etc, it takes forever for them to appear in my actual mailbox to start organizing. For example, I created a "Work" label 5 minutes before this review and as of right now, when I use the add label button on a message, it's not there despite it showing up in the settings.

What’s new

We’ve completely rebuilt the Proton Mail app to give you a faster, smoother, and more reliable experience.

What's new:
- Search results now highlight matching words
- Several improvements to Composer
- Fixed an issue where the onboarding bottomsheet would not be properly dismissed
- Fixed an issue where the attachments list would be limited to 10 items when viewing a message
- Fixed an issue where the Snooze time picker would be limited to 89 days in the future
- Other fixes and improvements