In the first sight, Google Keep ist not really promising. But If you work with it, you will learn almost daily new possibilities. There is an URL preview, the coloring options, and the interface is easy, but powerfull. And you can store informations from Google Docs, Sheets and Presentations in Google Keep or link to them. You can use the free CamScanner App to scan Documents and store them as an Image in Google Keep and the image document is searchable (OCR). If you don't want to use CamScanner, you can do the same with the Google GDrive App. Store the Information in Google Docs and link to it in Google Keep. The possibilities are endless. And the best of all it's free and a part of Googles G-Suit , so the Service will stay.