coLaboratory Notebook

Near fatal flaw: If you accidentally write an infinite loop in your program, there's often no way to interrupt it without killing the app and losing your work. The "stop" icon and interrupt menu items don't work reliably. It's awkward to restart the app; when it does come back up, I get an older version of the notebook that doesn't include changes that seemed to successfully have saved from the notebook menu. This combination of problems makes the app relatively useless for the quick one-off programming tasks I wanted to use it for.

It no longer seems to be updated; the README on GitHub indicates that support has been discontinued. When I attempted to launch a notebook from Drive, it wasn't successful. I would gladly use this product, or something similar, if it worked as advertised and was consistently supported over the long term.