Google Duo and Allo, the company's latest messaging applications, were announced back at Google I/O this year. Only Duo has been released to the public, and as I'm sure you all know, Google has been silent about the release date for Allo apart from a summer release. With the first day of fall coming on September 22, time is running out to meet the deadline.

Evan Blass, more famously known as @evleaks on Twitter, posted a tweet saying only "Hello, Allo (launches this week)." That's it. No other details, or a more specific release date. Rumors from other sources suggest September 21, but we are taking them with a grain of salt.

If you need a refresher, Allo uses your phone number as your primary identification, instead of a Google account. The advantage is that anyone with your phone number can send you messages on Allo (as well as Duo). There are other great features as well, including optional end-to-end encryption, the ability to talk to Google Assistant, and some funny sticker packs.

Evan just tweeted that he also believes the release is coming September 21. This adds some credibility to the claim, and September 21 marks the last day of summer (when Google promised to release Allo).