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Cloud Firestore - NoSQL database service offered by Google Cloud Platform. Has client and server libraries for just about any language. Very inexpensive, especially when considering the $300 annual credit all GCP accounts get.
Knack - create a non-technical database for our client. Frontend of the application allows users to RSVP to an event with a calendar application. Information is then transferred to the backend database.
- Simple, non-technical app builder