Firebase leads on realtime performance and ecosystem depth, delivering <50 ms sync (per Firebase docs) and 30+ SDKs (per official site). Supabase wins on value, offering a larger free tier and open‑source flexibility (per Supabase pricing). For projects that need SQL and want to avoid vendor lock‑in, Supabase is the better fit, but for high‑scale mobile apps Firebase’s mature infrastructure giv...
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