What are some alternatives?
When comparing Battle Exchange and Code-Free Startup, you can also consider the following products
hackattic - No nonsense, real world programming challenges
Code4Startup - Learn Ruby on Rails, Python, AngularJS, NodeJS, React, Ionic by cloning AirBnb , TaskRabbit, Tinder, Product Hunt, Fiverr and . more.
Frontloops - Level up your frontend skills with handcrafted tasks
Google App Maker - Low-code application development for G Suite
Code Fight Club - A fight club you can talk about. Less punching, more coding.
Airtable Blocks - Modular apps that enable anyone to build complex software