The Swiss-based ProtonMail secure email app combines state of the art security features with end-to-end encryption while being intuitive and easy to use. Used by millions worldwide, the ProtonMail app respects your privacy.

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

With the ProtonMail app, you can:
• Create a new email address
• Send and receive encrypted emails and attachments with ease
• Switch between multiple ProtonMail accounts
• Keep your inbox tidy and clean with folders, labels and simple swipe-gestures
• Receive new email notifications
• Send password protected encrypted emails to non-ProtonMail email addresses

Why use ProtonMail?
• ProtonMail is free: we believe everyone deserves privacy. To get more done and support our mission, you can upgrade to a paid plan.
• Automatic ‘easy-to-use’ end-to-end encryption that is invisible to the user
• Zero-access encryption meaning not even Proton can read your emails
• Open-source encryption that allows inspection by security experts from around the world
• ProtonMail is hosted entirely in Switzerland, under the protection of the world's strongest privacy laws

Industry Leading Security Features
Messages are stored on ProtonMail 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
ProtonMail'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
ProtonMail's open-source software has been thoroughly vetted by security experts from around the world to ensure the highest levels of protection. ProtonMail 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, ProtonMail can guarantee that the encryption algorithms used do not have clandestinely built-in back doors.

ProtonMail in the press:

“ProtonMail is a Gmail-like 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 and CERN promises to bring secure, encrypted email to the masses and keep sensitive information away from prying eyes.” Huffington Post

Follow ProtonMail on social for all the latest news and offers:
Facebook: /protonmail
Twitter: @protonmail
Reddit: /protonmail
Instagram: /protonmail

For more information, visit:

Our open-source code base:

What’s New

Version 1.15.11

ProtonMail for iOS version 1.15.11

This version contains the following updates:
- Fixed a bug where push notifications where not received properly
- Fixed an occasional bug where swipe actions in the inbox were applied to the wrong message
- Fixed an occasional bug where the reply, reply all and forward option did not work on some messages.
- Fixed an occasional bug during signup where the prompt for captcha was not fully visible
- Fixed a bug where contacts migrated through the Proton Easy Switch functionality were not properly displayed
- Preparation for upcoming change to exclude embedded images from counting towards attachments
- Technical improvements behind the scenes (including updates to the cryptographic library, improvements related to key management and password changes and more)

Ratings and Reviews

4.1 out of 5
2.5K Ratings

2.5K Ratings

Against Goggle ,

Excellent Service Great For Privacy!

I am a ProtonPlus paid user, I started with a free account but I actually paid 2 years in advance I like it so much. I really am not cool with advertisers having the ability to read my emails which often contain much personal info. The ONLY reason I am giving 4 stars instead of 5 (which is not really protons fault) is because there are some companies that will either not accept your email address from proton or some online stores that will cancel your order when you give them as your email. It has only happened a couple times so far. I’m pretty sure the reason they don’t accept is because they are assuming your are some kind of criminal or scammer because you have a private email. When in actuality it’s because people are starting to realize what are huge problem we are facing with these tech companies knowing every detail of our life and mind. Anyways I’m hoping as more people start to use Proton, the stigma will be erased. Also if you notify proton of this they contact the company that is denying your email. Other than that it’s great! Some great features for filtering your emails into different folders too

Developer Response ,

Thank you very much for your feedback! Please note that the vast majority of online services, including all major websites, allow you to use your ProtonMail email address when registering your account. Some, however, don’t, which is why we provide you with guidelines on what to do in such situations:

Joejoejoe344 ,

Nice mail app for privacy

I’d love a dark mode. Also, the search feature shouldn’t pop up like it does, but rather it “inbox” should be replaced with a search bubble and you should be able to search while not obstructing your emails. Additionally, it should refresh the email search after every letter and not finally when you click “search”. Furthermore, there should be a badge notification on the three line icon (hamburger icon) when you have an unread email in a folder that you’re not in (i.e. if I’m in inbox and there’s an unread mail in spam, there should be a red “1” to the top right of the hamburger button. Also, the swipe on any individual mail to mark it “unread” should mark it “read” if it is already marked “unread”. It shouldn’t just keep marking it “unread”, I shouldn’t have to open the email to read it. I should be able to customize folders from within the app. Besides these suggestions, the privacy is unrivaled. Update: I appreciate the developer’s response! I do hope to see some of these features in the next update (dark mode is of high priority on my list🙂). I actually figured out how to customize folders. You have to have opened an email and then you can add a new folder. I feel like this should be a side bar option (when you click on the hamburger button it should be in there somewhere). Thanks again for responding, looking forward to what you all do with it next!

Developer Response ,

Thank you for your feedback, support, and very detailed suggestions (which we will share with the team)! The upcoming major redesign of the app will have a different look and feel, and improved functionality.

EDIT: Thank you for clarifying the issue you've had with folder customization, your new suggestion will be shared with the team.

Milzc ,

Can’t send important emails/inconsistent

I’ve been using Prtnmail for a while, and it has recently been brought to my attention that I haven’t been able to send emails to specific secure emails, namely to my Credit Union Financial Operations (finops) and to the Claims Adjuster of my insurance company. Additionally, I can’t use my ProtonMail email address as my primary email address for my bank account, as they don’t allow anonymous email addresses to be used by their customers.

Is/are there ways to get around my issues I’m experiencing? These are important emails, and I wasn’t aware that they didn’t go through until I had contacted the aforementioned companies to follow-up with my emails. Had I not contacted my Credit Union, I would not have known that my email message didn’t get received by the finops department of my Credit Union. On the other hand, I did receive an email alert immediately after attempting to send my message to the Claims Adjuster stating that my message failed to deliver.

Can somebody at ProtonMail lend me assistance or explain the reason(s) as to why my messages aren’t going through? How can I resolve this issue? This is a deal-breaker for me, and I’ll need to find a secure email server that I can use for more consistency/reliability. It makes me wonder whether or not other important email messages I had “sent” were actually sent to the recipient(s).

Developer Response ,

Thank you for reporting this issue to us. To help you we need more information. We suggest contacting us via with the following information:

- the list of entities that have rejected, or have not received emails you have sent from your Proton address, with dates and times of those emails, if possible.
- the reason/error message provided, indicating that the mail was rejected, if you have received any
- non-delivery notice emails, in case you received any (please attach email headers)
- replies from the entities' support teams, in case you have contacted any, and heard back from them (screenshots of their replies would be best)

If you would allow us to mention your name in our communication with the entities in question, we would also need the name under which you communicate to the said entities, and the Proton e-mail address you use to communicate with them.

Thank you very much in advance.

App Privacy

The developer, Proton AG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

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Privacy practices may vary, for example, based on the features you use or your age. Learn More


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