Case study

Case study

GymZone

Client

Angel7Real

Category

Cross-Platform Fitness App Development

Duration

+12 months (ongoing)

Location

Madrid, Spain

Tech Stack

Mobile: Flutter

Web: Next.js

Backend: Nest.js

Infrastructure: AWS

About the Client

GymZone is a fitness app with workout tracking, gamification, and progress monitoring, available on web and mobile with a Nest.js backend. Users follow routines, earn achievements, and unlock exclusive content.

The Challenge

When we joined the project, development had stalled — the original developer could no longer continue, and the platform risked being abandoned. The client needed a team to:

  • Revive and stabilize the existing codebase across mobile, web, and backend.

  • Implement new features to expand engagement and retention.

  • Build collaboration tools so the admin’s team could manage programs and clients efficiently.

  • Ensure scalability for an upcoming relaunch targeting tens of thousands of users

Key Goals

Our team took full ownership of the project, improving performance, fixing critical issues, and delivering new features:

  • Gamified Fitness Tracking
    Users complete workout routines, track progress, and earn achievements to boost motivation.

  • Subscriber-Exclusive Content
    Paid users unlock new workout programs and advanced features.

  • Admin & Collaboration Tools
    The admin can manage programs with a team of collaborators, assign routines, and monitor client progress.

  • Weekly Revision Tracking
    Clients fill out weekly progress check-ins, giving trainers a clear view of adherence and improvement.

  • Cross-Platform Stability
    The Flutter mobile app, Next.js web platform, and Nest.js backend were refactored for better performance and scalability.

Our Approach

Radical Online approached GymZone as both a rescue mission and an opportunity to set the product up for long-term growth. Our strategy emphasized:


  • Stabilize First, Build Second — We began by auditing the Flutter, Next.js, and Nest.js codebases to fix critical issues and restore stability. This ensured the platform could support active users before introducing new features.

  • Cross-Platform Consistency — We aligned the mobile and web experiences, refactoring code for performance and scalability, so users had a seamless experience regardless of device.

  • Feature Expansion with Engagement in Mind — New features were prioritized around gamification, subscriber content, and progress tracking to increase retention and deliver immediate value to both free and paid users.

  • Collaboration Tools for Admins — We enabled trainers and administrators to work as a team, adding tools for program management, client assignment, and progress monitoring.

  • Scalable Infrastructure Planning — Anticipating a relaunch aimed at tens of thousands of users, we optimized the backend and AWS setup to ensure reliability and room for growth.

  • Iterative Development Partnership — By working closely with the client over an extended engagement, we continuously shipped improvements, validated them with real users, and built momentum toward the new launch phase.



Through this approach, GymZone was transformed from a stalled project into a thriving, scalable fitness platform that continues to grow its user base and feature set.

Key Features

  • Gamification — Achievements and rewards keep users engaged.

  • Subscriber Unlocks — Exclusive routines and features for paying members.

  • Collaborative Admin Panel — Multiple trainers can manage programs and clients together.

  • Progress Tracking — Weekly check-ins and stats for ongoing improvement.

Impact

  • Successfully revived a stalled project and restored full operational capacity.

  • Over 30,000 registered users and growing, with a new launch phase imminent.

  • Continuous development for more than a year, adding features and improving stability.

What our client said

"My experience with Radical Online was unique because they approached me proactively for a project that would have been difficult to complete without their help. From start to finish, they were attentive, experienced, and precise, delivering a final product that exceeded my vision. I’m grateful for their dedication and look forward to working together on future projects."

Angel Díez

Founder at Angel7Real

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