What are some alternatives?
When comparing Const Apps and BuildFire, you can also consider the following products
AppSheet - AppSheet enables users to create mobile apps instantly for both OS and Android.
Bizness Apps - Create your own app or become a reseller and build apps for others
Microsoft PowerApps - Microsoft PowerApps provides tools to create, customize, share and run apps.
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Jasonette - Make an app by adding JSON to this app.
GoodBarber - GoodBarber is a mobile app creation platform.