sencha gpl ext js mobile app builder

you can use the sencha ext js gpl framework to build gpl android mobile apps

• https://www.sencha.com/legal/GPL/

but you cant use it to create ios apps because apple rules violate the gpl terms

• https://www.fsf.org/blogs/licensing/more-about-the-app-store-gpl-enforcement

without buying a different licence from sencha first