Booking apps are one of the most common requests we get from Australian service businesses — physio clinics, beauty salons, personal trainers, tradespeople, and anyone else who runs on appointments. The core idea is simple: let customers book online, without phone calls.

But "a booking app" can mean a lot of things, and what you actually need to build depends heavily on your specific business. This guide covers the features that typically matter — and links to cost breakdowns for each one.

The non-negotiables

A booking system

This is the centrepiece. A booking and appointment system handles availability logic, lets customers pick a slot, and creates a confirmed booking in your calendar. The cost varies from $1,000 to $4,000 AUD depending on complexity — single provider and service type on the low end, multiple staff with individual availability, buffer times, and group bookings on the high end.

What catches people out: availability logic is more complex than it looks. Handling time zones, preventing double-bookings, buffer times between appointments, and working hours exceptions (public holidays, blocked-off days) all need explicit implementation.

Payments

Most booking apps need to collect payment — at minimum a deposit, often the full amount upfront. One-off payment processing through Stripe or similar adds roughly $1,000–$2,000 to the build. If you run ongoing sessions or memberships, subscription billing is the right model instead — similar cost, different implementation.

Notifications

A booked appointment is useless if the customer forgets about it. You need:

• Transactional email — confirmation emails, reminder emails, cancellation notices. Roughly $1,000–$2,000.
• SMS notifications — for reminder texts, which have dramatically higher read rates than email. Add $1,000–$2,000.
• For mobile apps: push notifications — "your appointment is tomorrow at 9am." Another $1,000–$2,000.

Most booking apps use at least two of these three.

Features that matter for most businesses

Login and user accounts

If customers are booking repeatedly, they need accounts so they can see their booking history, reschedule, and not re-enter their details each time. Email & password login is the baseline. Adding social login (Sign in with Google, Apple) reduces friction at signup — worth it for consumer-facing apps.

Role-based access

Your staff need a different view from your customers. A therapist needs to see their daily schedule; a customer needs to see the booking form and their own history; an admin needs to manage everything. Role-based permissions separates these cleanly — $1,000–$2,000.

Calendar sync

When a booking is made, most providers want it to appear automatically in their Google Calendar or Outlook. Calendar sync handles this one-way (booking creates a calendar event) or two-way (calendar changes block availability in the booking system). One-way is simpler and usually enough — two-way sync is significantly more complex and adds cost.

Features for more complex use cases

Resource and staff scheduling

If you have multiple staff, rooms, or equipment that can be booked independently, you need resource and staff scheduling on top of the basic booking system. This adds the logic for "book anyone available" vs "book a specific person", and manages each resource's individual calendar.

Real-time availability

For high-volume bookings where slots can fill up quickly, real-time updates via WebSockets show customers live availability — so two people don't race to book the last slot and one gets disappointed. More common in high-demand practices and event bookings.

Intake forms

Many service businesses need to collect information at booking time — medical history, consultation questions, preferences, waivers. This is generally custom form logic built alongside the booking system rather than a separate feature, but it adds time.

What does a complete booking app cost?

A minimal booking app — single service type, one provider, payment on booking, email confirmations, customer accounts — typically comes in around $8,000–$15,000 AUD all up.

A more complete system — multiple staff, calendar sync, SMS reminders, mobile app with push notifications, role-based access for admins and staff — runs $20,000–$40,000 depending on scope.

The app cost calculator lets you select exactly the features you need and see a rough estimate for your specific combination.

Questions to ask before you build

Do you need a custom-built booking system, or could an off-the-shelf tool work? Calendly, Acuity, and HotDoc (healthcare) solve booking well for many businesses. A custom build makes sense when you need deep integration with other parts of your app — customer records, job management, payments — or when off-the-shelf tools don't fit your workflow.

How many staff or resources need separate availability? Each one adds complexity to the availability engine.

Do customers need to be able to self-serve reschedule and cancel? And up to how close to the appointment? This logic needs to be defined before build.

What notification types do you actually need? Email confirmation is essential. SMS reminders add real value for reducing no-shows. Push notifications matter for mobile-first apps. Don't build all three unless you need them.

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See also: Booking & appointment system costs · Calendar sync · Resource & staff scheduling · App cost calculator