Still taking bookings over LINE?
Keep it. LINE is where your customers already are, and nothing here asks you to move them off it. It just was never meant to be a calendar — and that is the part that costs you.
The same day, two ways
A customer messages at 11pm
You see it in the morning. By then they may have called somewhere else.
They book the slot themselves, while they are thinking about it.
Two people want the same time
You check the notebook, or you find out when both turn up.
The second person is never offered a time that is already taken.
The day before an appointment
You type reminders one by one, or skip it and hope.
The reminder sends itself, two hours before.
Someone needs to cancel
They message, you scroll back to find the booking, you rub it out.
They cancel from their own link and the slot frees itself.
A staff member asks what their day looks like
You read it out of the chat history, or out of your head.
They open their own calendar on their phone.
You want to know how the month went
You count it up, if you have time.
It is already counted.
You are not choosing between them
The booking page is one link. Put it in your LINE profile, pin it to the chat, print it as a QR code for the counter. Customers who want to chat still chat — they just stop needing to message you to book a time.
No card, no trial countdown. You only pay in months you pass 100 bookings.