restdb.io is a Plug-and-Play Database Service, suited perfectly to power business apps and dynamic web content. Databases are built in an easy to use web interface. It features a rich selection of data types and relation types as well as Excel import/export. A REST API reflects the database and plugs right into your app, web page or prototype.
Limitations:
1000 database objects, low-perfomance API, 1 concurrent user
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