Gym management apps, class booking systems, and personal trainer apps all share common feature needs. Here's what to build and what it costs in Australia.

Fitness businesses — gyms, yoga studios, CrossFit boxes, personal trainers, pilates studios — run on memberships, class bookings, and retention. The app is the glue: it's how members book classes, track their attendance, pay their membership, and stay engaged between visits.

Most fitness businesses start with tools like Mindbody, Pike13, or Glofox. Custom development makes sense when you're building a consumer fitness product (a training app, a workout tracker), when your membership model is unusual, or when you need features that platforms don't support well.

Here's what a gym and fitness app typically needs.

Class booking

A booking system for fitness needs to handle classes with capacity limits — only 20 people in a spin class — as well as waitlists when classes fill up. Members should be able to browse the weekly schedule, book and cancel sessions, and see their upcoming bookings in one place.

For personal training studios, booking is one-on-one rather than group: each trainer has their own availability, and clients book directly with their trainer or with "anyone available."

Cancellation policies matter here: a fitness studio that charges for late cancellations needs to enforce this automatically, not manually.

Membership and subscription billing

Subscription billing is the core revenue model for most fitness businesses: a weekly or monthly direct debit for gym access or a class pack. The billing logic needs to handle:

Different membership tiers (casual, unlimited, peak/off-peak)
Pauses for holidays or injury
Cancellations with notice periods
Failed payment handling and retry logic

For class packs (buy 10 sessions, use them over 3 months), you need entitlement tracking alongside the billing — the system knows which members have sessions available when they try to book.

One-off payments

Casual visits, merchandise, personal training top-ups — one-off payment processing handles everything that isn't on a membership plan. Card on file makes this frictionless: a member who wants a casual visit can pay without re-entering payment details.

Push notifications and re-engagement

Push notifications are particularly valuable in fitness because member engagement is variable — people go in waves. Notifications that serve a purpose (class reminder, new timetable published, trainer availability opened up) build habit. Re-engagement messages ("you haven't been in 2 weeks — your trainer has spots available") can recover lapsing members before they cancel.

The key is relevance: fitness members are quick to mute apps that send notifications that don't feel personal.

User profiles and attendance tracking

User profiles store membership status, booking history, and attendance records. For fitness businesses that track member progress (personal bests, weight history, body composition), profiles store this too — making the app genuinely useful rather than just an administrative tool.

Attendance data also drives retention analysis: members who attend fewer than twice a week are significantly more likely to cancel. If the app surfaces this insight, it enables proactive outreach.

In-app messaging

In-app chat between trainers and clients — programming feedback, technique questions, check-ins between sessions — adds genuine value for PT-focused businesses. It keeps the conversation in one place rather than scattered across SMS and Instagram DMs.

For class-based businesses, messaging is less important; for PT and coaching businesses, it can be a key differentiator.

What does it cost?

A solid gym or fitness app — class booking with capacity management, subscription billing, push notifications, user profiles, attendance tracking — typically runs $20,000–$40,000 AUD depending on the complexity of membership logic, number of locations, and whether PT-specific features are included.

Use the app cost calculator to estimate your specific build.

Questions to ask before you build

Are you building for one studio or a multi-location chain? Multi-location adds complexity: members may want to visit any location, timetables differ by site, and reporting needs to roll up across locations.

How complex is your membership model? A single flat-rate membership is simple. Tiered access, family memberships, corporate accounts, and usage-based billing each add development time.

Do you need a consumer-quality training app (workout tracking, programming), or just a booking and membership tool? Training apps are significantly more complex — they need exercise databases, custom programming tools, and progress tracking. Scope these as separate products.

What happens when a membership payment fails? Define the retry logic, access freeze rules, and member communication before build — this logic affects member experience significantly.

Code Workshop

What does a gym or fitness app need?