Monica is meant to host all the private information about your contacts. By nature, this is personal, and private. However, there are some cases where you would want to share these information to someone else - your spouse for instance. It's easy how Monica, in a context of a couple, can help the couple as a single entity to organize the relationships they have with their loved ones.
To address this use case, we are introducing the support for multiple users in a single account.
Adding users happens via email. As a security measure, the person you invite by email will have to enter the email of the user who has invited her upon registering.
You'll find user management when you click on the Settings tab in your account.
This feature is the first paid feature. The paid plan is called Chandler and costs USD $10 per month. This plan is only available on https://monicahq.com and does not affect self hosted installations. If you host Monica on your own server, you have access to paid features for free.
Take a look at the pull request to know more about this.