Need an ultra simple, low-cost or free software / app solution for a nonprofit allowing clients to login & check their status

Anyone have advice on a really simple low cost software / app solution that would do this for about 100 clients of our nonprofit organization:

A client would login with their own unique password and login name or ID to a web site or via an app on their phone (absolutely would need to be something someone could view on their phone), and they would see their name (confirming that it's them), a message from the project manager about where they are in the queue ("It is estimated that your project will start in September 2024, and you will receive a call at least four weeks before to confirm"), and a date for when the info was last updated.

It can't be a spreadsheet of all projects because the names of clients needs to be confidential, even if there is no other identifying info, and because so many people have the same or similar names.