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| Website | emitter.io | opalstack.com |
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When comparing emitter.io and Opalstack, you can also consider the following products.

Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
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Etebase makes it easy to build end-to-end encrypted applications by taking care of the encryption and its related challenges.
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An open protocol for per-user storage OWN YOUR DATA
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PubNub is a real-time messaging system for web and mobile apps that can handle API for all platforms and push messages to any device anywhere in the world in a fraction of a second without having to worry about proxies, firewalls or mobile drop-offs.
Compare PubNub to emitter.io or Opalstack: