A different case from this register's Supabase entry: Firebase's real-time sync engine and global infrastructure are Google's proprietary technology, not an open-source core you could self-host instead. The managed service isn't optional convenience here — it's the only way to get this specific technology.
VIBE SCORE 88/100
A moderate score above just means the individual parts are buildable — it isn't a build/buy recommendation on its own. Here's the actual reason this one's still JUST PAY:
The parts this build actually needs, each rated on its own — the average is the Vibe Score above.
| Landing page | 99 |
| CRUD database | 95 |
| User login | 92 |
| Realtime collaboration | 67 |
Two real costs, not just "free": the AI agent's own usage, and hosting once it's running. Both are estimated from this app's own effort rating and component list — see the assumptions on the method page.
| AI agent — with a subscription (Claude Pro/Max, Cursor, etc.) | $0 marginal |
| AI agent — pay-per-use API, no subscription | $86–$172 one-time |
| Hosting, once it's running | $5–$10/mo |
| Domain name, if you want your own | ~$12/yr |
Firebase's pricing varies — check the source link on this page to compare against your own build cost.
Just pay. A different case from this register's Supabase entry: Firebase's real-time sync engine and global infrastructure are Google's proprietary technology, not an open-source core you could self-host instead. The managed service isn't optional convenience here — it's the only way to get this specific technology.
Firebase's pricing varies by plan — check the source link on this page for current numbers.
Firestore's real-time sync engine, automatically propagating changes to every connected client at global scale, is proprietary infrastructure you can't self-host — unlike this register's Supabase entry, there's no open-source equivalent underneath Offline-first sync with automatic conflict resolution across devices is genuinely deep distributed-systems engineering Global multi-region data replication at Google's scale is infrastructure investment beyond what self-hosting can replicate
Closest matches on the register — ranked by the build parts they share with Firebase, not just by category.
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