Google Lens has been around for a little over three years now, though it only became a standalone app in mid-2018. In that 2.5-year time span, the app has managed to hit 500 million downloads off the Play Store. That's not bad for a niche app that doesn't come pre-installed on anything.
We at AP don't think that Lens gets enough praise; we even named it one of our 10 favorite Android features from 2020. Lens is an AR-powered service that can help you translate, identify, and scan things around you. Last year, it added support for solving homework questions, text-to-speech and "copy to computer" functions, and helping choose the best dishes at restaurants. There's lots of nifty stuff that Lens can do.
If you'd like to put Lens on the path to one billion installs, you can do so via the widget below.