The fitness app builder for US gyms, trainers, and studios.
Class schedules, mobile booking, workout plans, member progress tracking, and push reminders. Replace MindBody, ClassPass, and four other tools with one branded app your members install once and use forever.
Every feature a modern fitness business needs.
The US fitness app market hit $5.2 billion in 2025. Your members are already on apps - the question is whether they are on yours, or someone else\'s.
Class Schedule & Booking
Members browse classes, reserve a spot, and check in - all from the app. Capacity limits, waitlists, and cancellation windows built in.
Workout Library
Upload routines as videos, PDFs, or step-by-step instructions. Tag by muscle group, difficulty, and equipment. Members access on demand.
Personal Training Plans
Assign custom programs per client. Track sets, reps, weights, and PRs. See client adherence at a glance.
Push Reminders
Pre-class push 30 minutes before start. Missed-session nudges. New-program-available alerts. Drives 2-3x higher attendance.
Membership & Auto-Pay
Sign-ups, plan changes, and recurring billing through Stripe. Members can pause, upgrade, or cancel from inside the app.
Progress Photos & Body Stats
Members log measurements, weight, photos. Side-by-side comparison view. Motivating, and a powerful retention tool.
Trainer Messaging
In-app chat between trainers and clients. Voice notes, video form-check uploads. Keeps coaching off WhatsApp and inside your brand.
Challenges & Leaderboards
30-day challenges, weekly streaks, community leaderboards. Gamification proven to boost retention 20-40%.
Native iOS & Android
Real native apps - not webviews. Apple Health and Google Fit sync, push notifications, offline workout access.
Retention is the whole game.
The average US gym sees 25-50% annual member churn. Most of that loss happens silently - a member skips three weeks, feels guilty, and cancels the auto-pay. A branded fitness app changes the math: members see their booked classes, get a push notification before sessions, log their progress, and feel the gym every day instead of remembering it on billing day.
Personal trainers see the same dynamic in miniature. A client who has your app on their home screen is a client who finishes the program. The app holds the workouts, the schedule, the progress photos, the messaging - everything between sessions that used to live in scattered texts and screenshots.
For every kind of fitness business.
Independent Gyms & CrossFit Boxes
Class booking, member check-in, workout-of-the-day push. Build the community feel that keeps members from switching boxes.
Yoga & Pilates Studios
Booking, video class library, sound-bath audio, schedule reminders. Hybrid studios serve in-person and at-home members.
Personal Trainers & Coaches
One-to-one programming, video form check, nutrition logs, monthly check-ins. Service 30+ clients without burnout.
Boutique Fitness Brands
Branded experience across multiple US locations. Members travel and still find their workout. Loyalty cross-pollinates between studios.
Corporate Wellness Programs
Steps challenges, healthy-eating tracking, monthly themes. HR teams use it to drive participation in benefits programs.
Online Fitness Coaches
Pure-digital coaching businesses sell programs, take subscription payments, and keep the customer relationship 100% in-house.
Gym & trainer questions
How does this compare to MindBody or ClassPass?
MindBody and Mariana Tek charge $200-$500/month plus per-booking fees and own the customer relationship. AppBuilder24 starts at $15/month, has no per-booking fees, and the app is 100% your brand.
Can I sync with Apple Health or Google Fit?
Yes. Workouts logged in the app push to Apple Health (HealthKit) and Google Fit. Steps, heart rate, and other metrics pull back in for unified tracking.
Can trainers run online and in-person clients from the same app?
Yes. Each client has their own program, schedule, and check-in flow. In-person clients book classes; online clients follow assigned routines and submit form-check videos.
Do members need to be on iPhone or Android?
Both. The app publishes to both Apple App Store and Google Play. Roughly 50/50 in the US, so building for one store leaves half your members behind.
How do I take recurring payments for memberships?
Stripe and PayPal are integrated for recurring billing. Set monthly, quarterly, or annual plans. Members manage their subscription from the app - no awkward "call to cancel" flows.
Can I run challenges and competitions?
Yes. Built-in challenge module: set the rules (most check-ins, fastest mile, total volume lifted), invite members, automatic leaderboard. Great for January New-Year-resolution push.
Your fitness app, live in a weekend.
Stop paying MindBody $200+ a month. Build your own branded app for a fraction of the cost.
Start Building →