How to implement accounting of customer visits from the phone?

Question

CRM

Hello, tell me a free service for tracking customer visits. Now the mechanics are as follows: there are 4 halls where trainings take place, the instructor notes those present at each training session. Now we do it in Trello, we create a card with a checklist and every training session we copy the template and mark the attendees, which allows us to calculate the total number of people in the session. But how do you track each client to see when their 8-class membership ended? Do you need to be able to work with this service from your smartphone
? Or maybe Trello can be improved somehow?

Answer 1

You hand out cards with a barcode to clients (pokhzhey garbage)
You take a Plashent / Phone / Scanner barcode at the entrance. Next, the accounting program in the Fitness Center which will be counted visits.
They lied for free ... you will find something similar.
Judging by your signature I am making a gymnastics website , you want a mobile application that will send data to the site.
Or is there an online database

Answer 2

I would spend a little of my monthly budget and make the simplest possible database. You, at its core, only need a few pages (add, edit, display users).
I'm probably judging as a developer, I would spend a couple of days on this, but I did it as it would be convenient for me.
From ready-made, you can look at something from free crm, maybe you will find something.