Google Keep

With Google Keep, not only can you jot down ideas or put together to-do lists, you can also share them with friends and family.

Set reminders for any note or checklist, either as a time-based alarm or as a geo-tagged note, e.g., your grocery list can be set to buzz when you are in a supermarket. You can even dictate a note and save as a voice recording.

Search for notes by colour or other attributes such as whether they’re shared, have a reminder, are lists or have an image or audio. Its archive feature allows you to review old notes in case you need to access them again.

Whatever changes you make are instantly saved and synced with all your devices.

Free on Google Play and on the Chrome web store.