Yes, both AppInstitute and nandbox offer a Free Trial.
AppInstitute is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
nandbox is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for AppInstitute Starts at $42/Month when Billed Yearly whereas for nandbox Starts at $49/Month.
Some top alternatives to AppInstitute includes AppYourself, Bizness Apps, A2Zapps, Apphive, Native, geekApps, 2OS App Builder and AppMaster.io.
Some top alternatives to nandbox includes Nwicode, Bizness Apps, GitHub, Apphive, AppInstitute, Native, AppMaster.io and Codeless.