AI-powered fitness app loved by over 2.5M users

In today’s crowded fitness app landscape, many people still have to deal with cookie-cutter routines, motivational slumps, and frustrating plateaus. The AgileEngine team helps overcome these issues by contributing to the development of a cutting-edge fitness app powered by AI. With adaptive training plans, expert coaching, and built-in social features, the app empowers users to stay consistent and achieve real progress faster.

Hero image

Industries

Fitness, HealthTech, Healthcare, Wellness

Services

Mobile development, Backend development, Feature development, AI engineering

Solutions

Mobile application, B2C application, System optimization, AI integration

Technologies

Java, Kotlin, Swift, PHP

AI tools that powered our workflow

Copilot

Outcomes
and highlights

  • 4.8-star App Store rating and a spot on PCMag’s Top 12 Best Workout Apps of 2025 earned by the client’s app
  • 2-week development cadence for new feature development, enabled by our process optimizations
  • Last-minute changes, such as a payment processor switch just one week before the agreed delivery date, successfully handled by our team

Solutions overview

Project overview

Fueling the fitness journeys of millions

AgileEngine’s work with the company evolved from closing delivery gaps to driving core feature development workflows. Today, AgileEngine provides over 60% of the client’s engineering capacity, with our experts integrating seamlessly with the company’s product team.

One of the critical initiatives undertaken by our experts is integrating a voice AI solution that enables users to interact with their virtual coach in real time. The solution we developed also enables hands-free coaching, with workout adjustments informed by live heart rate data from smartwatches, fitness trackers, and other compatible connected devices such as AirPods Pro 3.

Key deliverables

  • Integration of a third-party voice AI service, enabling real-time, hands-free interaction with the virtual coach
  • Optimization of the native Swift codebase, including new feature development, bug fixes, and performance enhancements
  • Extension and maintenance of the native Kotlin Android app, ensuring consistency with iOS features and broad device compatibility
  • Backend enhancements in the PHP-based system to improve stability, support evolving business logic, and align with frontend updates
  • Technical discovery sessions to align on mobile architecture, backend services, and integration strategies
  • Introduction of end-to-end testing to improve product reliability and release confidence
  • Complete CI/CD rewrite resulting in a more stable and usable pipeline
  • Introduction of a shared design system and snapshot testing, ensuring UI consistency
  • Integration with a real-time AI text-to-speech API, giving users spoken voice notes from their coach

Technologies

Java, Kotlin, Swift, PHP

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