Adalo
8.2#1 in startup app builderFrom $36 a monthFree planAndroidiOSWeb
VisitAdalo suits people building database-driven apps for web, iOS and Android from a shared project. The free tier may suit those starting to build and test, while paid plans add app publishing and team editors.
Snapp AI may suit people who want to generate apps with AI and have source-code export available. Its free plan offers a starting credit balance, while paid plans provide larger stated credit allowances.