256 MB from the REST API; 16 MB from the SDKs . The total data in each write operation should be less than 256 MB. Multi-path updates are subject to the same size limitation. The total bytes written through simultaneous write operations on the database at any given time.
Read moreWhat large apps use Firebase?
2649 companies reportedly use Firebase in their tech stacks, including Instacart, LaunchDarkly, and Twitch.
Read moreIs Firebase good for big applications?
Conclusion: If you’re building something cool and needs a fast, reliable database, user authentication and usage tracking, then Firebase is a great way to go. Not recommend for complex project . Large application, very few people use serverless, if you do not want later to pay expensive to sit back.28 Kas 2017
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