Mock up of what the mobile and desktop version of atmospherePro looks like

Safe, Encrypted File Transfer

Try it out today!

atmospherePro makes truly encrypted file transfer possible. Send files from any device to any device regardless of location. Share contracts, tax documents , and other confidential information without worrying about your data being stored on a server in the cloud. Ensure that your files are totally private and secure.


Windows coming out soon!

Windows coming out soon!

Why atmospherePro?


atmospherePro is cross-platform, so whether you’re on iOS, Windows, or Android, file-sharing is easy, and truly secure.

atmospherePro is especially effective for business, allowing for secure transfer of sensitive documents and files.

No third party, including us, can ever see your data without your permission! Only the sender and selected recipient have access.

AtmospherePro vs. Everything Else

Comparison chart

AtmospherePro FAQs

What is atmospherePro?

atmospherePro is a file transfer app created by Atsign. atmospherePro is a privacy-first, file transfer app using true end-to-end encryption. It’s entirely different from other file sharing apps or services because you own the encryption keys!

What does true end-to-end encryption mean?

When you send a file with atmospherePro, it’s encrypted on your device and can only be decrypted by the intended recipient. Since we do not have access to your personal keys, we are unable to access your data.  In short, true end-to-end encryption is encryption with no loopholes. 


How is atmospherePro different from other file sharing services?

Other file sharing services route files from the sender to their servers and then on to the recipient. And because the service provider has access to the encryption keys, they can access your transferred files—and so can hackers! With atmospherePro you are protected because you hold the encryption keys and your files are not stored* on a server.

*All transferred files are temporarily stored in an encrypted cache until the recipient retrieves the file, for up to seven (7) days. Any files not retrieved are deleted from the server.


Is atmospherePro secure?

Yes it is! Transferred files are temporarily stored in an encrypted cache until the recipient retrieves them. In the unlikely event that someone were to access the files without permission, they would not be able to read them without the keys. Even the app creators cannot view files.


What’s the maximum file size?

At the present time, our maximum file size is 1GB.


Is there a desktop app?

Yes there is!  We offer the same secure file transfer system for desktop, too!

Is this an open-source project?

It is! We’re an open-source company and we encourage developers to build their own apps and contribute to the existing atPlatform.  Developers may download, modify and repurpose.

Get AtmospherePro Today!

Get AtmospherePro Today!

Windows version coming soon!

AtmospherePro is a Flutter app built on the atPlatform, a technology that is transforming the Internet experience by putting you in control of your data.

Learn more at