Lumio is what happens when someone actually thinks about how to make a Chromebook useful in a classroom instead of just a distraction. It's essentially a 'live layer' that sits on top of standard slides and PDFs, letting teachers see what kids are doing in real-time.

From a parent's perspective, it's one of the 'good' school apps. It doesn't have ads, it's not trying to sell your kid a subscription, and it actually encourages them to talk to the kid sitting next to them. If your kid's school uses it, you can rest easy—it's high-utility, low-toxicity tech.