Simple Gmail Notes is a free and open-source Chrome extension developed by Bart Solutions. It allows users to add notes to their email threads in Gmail and Inbox. The notes can be stored in the user's own Google Drive, ensuring privacy and security.

One of the main features of Simple Gmail Notes is the ability to add notes to the calendar. This feature allows users to easily keep track of important dates and events associated with their email conversations.

Another useful feature is the ability to show note abstracts in the email summary page. This allows users to quickly get an overview of the notes without having to open each individual email.

Simple Gmail Notes also supports multiple Gmail accounts in the same browser, making it convenient for users who manage multiple email accounts.

For users who need to access their notes on mobile devices, Simple Gmail Notes supports sharing to mobile devices through the Simple Mobile CRM app.

Overall, Simple Gmail Notes is a useful tool for adding notes to email threads in Gmail and Inbox. Its integration with Google Drive and support for multiple Gmail accounts make it a versatile and practical extension for Gmail users.