Peerio

[10] Peerio allows users to store encrypted files online, offering limited cloud storage for free with optional paid upgrades.

For in-transit encryption, Peerio Services used Transport Layer Security (TLS) with best-practice cipher suite configuration, including support for perfect forward secrecy (PFS).

You can view a detailed and up-to-date independent review of Peerio's TLS configuration on SSL Labs.

[11] Peerio (Legacy) was a free application, available for Android, iOS, Windows, macOS, Linux, and as a Google Chrome extension.

According to the company's blog, Peerio 2 is purported to be a "radical overhaul" of the original application's core technology.

[3] Claimed benefits in comparison to Peerio (Legacy) include increased speed, support for larger file transfers (up to 7000GB), and a re-designed user interface.