StretchItDeveloping a mobile app

StretchIt Preview Image и Logo.jpg
  • web service
  • mobile application
  • UX/UI
  • frontend
  • backend

About client is a young and ambitious company founded by a small group of enthusiasts who create individual and collective teaching methods for yoga and stretching. They decided to expand their audience with a mobile app and contacted us at YetiCrab to implement their project.


The client asked us to develop a complex cross-platform application for iOS and Android. Through the apps, users should be able to access personalized yoga and stretching video tutorials.


So we were faced with the following tasks:

  • Development of a mobile application.
  • Creating a unique outstanding design.
  • Implementation of an individual schedule for users with a unique set of exercises.
  • Smart workout builder developing.
  • Including the ability to compare the results before and after stretching. 
  • Integrating a counter of calories burned during exercise.
  • Connecting payment systems for app monetization.
  • Connecting a database on a cloud platform.
  • Writing a content management system.
  • App adaptation for all types of modern devices.


Our client expected to get a full-fledged digital product that provides users with 24/7 access to practices, a convenient, simple and clear interface, and a personalized training system.


Project development

  • Node.js
  • Angular
  • iOS
  • Android
  • Flutter icon

After the client accepted a design of the project, we started to create a future platform using a technical stack, which included: Dart, Swift, JAVA, Node.js languages, Flutter frameworks, Angular, NestJS, MongoDB database. 


What we did for the client:

  • Researched the market of sport applications and determined the best option for our client's solution realization.
  • Created a unique design with an intuitive interface for managing workouts and schedules.
  • Implemented support for modern video formats that can be viewed in the application.
  • Developed local storage for downloading files to the device and their subsequent offline playback.
  • Сreated our own video player and integrated it fully into the mobile application.
  • Ensured full offline operation mode.
  • Developed a communication system between a student and an instructor
  • Categorized users by the level of training.
  • Connected a payment system to purchase a subscription for lessons.


The result of our work was an innovative cross-platform digital product for mobile devices. It allowed users to exercise self-guided yoga and stretching workouts from home. The client received a progressive application that can be scaled with new features and content in the future.


  • Mobile application for iOS and Android platforms on a turnkey basis.
  • Innovative video player.
  • Monthly income from the application is more than $5,000.
  • Over 20,000 monthly active users.
  • Platform for product scaling.
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