Based on our record, Kuzzle seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can try https://kuzzle.io/, the platform is a highly scalable Node.js application and include it's own realtime engine in C++. Source: almost 2 years ago
Also I recommend you to use foreign-key database structure, instead of documents. To my opinion it suits better to Parse Server. If you wanna use documents, you could try kuzzle also good solution! Source: about 3 years ago
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Back4App - Low code backend to build apps faster and scale easily.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Google Cloud Functions - A serverless platform for building event-based microservices.