What major apps use Firebase?

Google Firebase is a Google-backed application development software that enables developers to develop iOS, Android and Web apps . Firebase provides tools for tracking analytics, reporting and fixing app crashes, creating marketing and product experiment.

2678 companies reportedly use Firebase in their tech stacks, including Instacart, LaunchDarkly, and Twitch.

There are some big companies that use Firebases services ( as evident by this list ).