[draaglom]

Top line: work out how much value it's giving your clients and then aim to price to capture a fraction of that.

Without your app, it'd cost your clients $X in hours worked doing the book keeping, organisation and confirmations plus $Y in lost business due to mixups / confusion / etc from the alternatives.

What units you charge in to capture this fraction (billing for usage, per seat, whatever) is your second question, but you want to keep it as simple as possible while aligning to the value that the client is getting. Per successful booking probably makes sense here (I would imagine...)

>But what do I do with the cancelled bookings [...] I still pay for the sent SMS notifications :(

I'd suggest accepting these as a cost of doing business and pricing high enough that it doesn't matter.

[throwAway2021_1]

Without the app, the client is wasting 1h per day answering the phone and calling customers for reminders (or texting them). I don't imagine that all the customer who are calling will use the app all of a sudden, but it will happen in time.

45m-1h/day = 15-20h/mo (on average) 15h/mo = 10% of employee's working time

> Per successful booking probably makes sense here (I would imagine...) Another competitor is charging a fixed fee per booking and a booking is considered billable, if it's not cancelled after X hours after the start date/time.