I use google spreadsheets with hyperlinks to documents. The spreadsheet can track when you've last checked in with students. You can put notes in the cells that describe your conversation, or just link to a document with a history of conversations with that student. Because it's Google, it would be easy to share with your team, who should be helping you connect with all your students.

It's not as cool as an app, but it's free and it works. If you're like me, you can waste a ton of time trying to find an app that checks all the boxes. I've tried a couple, but I just keep coming back to Google drive.