The best Supabase alternative in 2026 is Neon if you want serverless Postgres without the bundled backend, Convex if you want a TypeScript-first reactive backend, and Appwrite or Nhost for the open-source full-stack model. Firebase remains the pick if you are happy on Google and NoSQL. Supabase is still the default when you want Postgres plus auth, storage, and realtime in one.
Key takeaway: Pick by need: Neon for pure serverless Postgres, Convex for a TypeScript reactive backend, Appwrite or Nhost for open-source BaaS, Firebase for Google and NoSQL. Supabase wins when you want the whole bundle on Postgres.
I run production directories on Supabase and have shipped client work on several of these. Here is the honest split.
Neon
Serverless Postgres with branching, scale-to-zero, and a clean separation of storage and compute. Best when you want the database only and will bring your own auth and APIs. Watch: it is Postgres, not a full backend, so you assemble the rest yourself.
Convex
A TypeScript-first reactive backend where queries update the client in real time and the data layer is code, not SQL. Best for product teams that live in TypeScript and want reactivity without wiring it up. Watch: it is a different mental model from SQL, and it is not Postgres.
Appwrite and Nhost
The open-source full-stack route. Appwrite is a self-hostable BaaS with auth, storage, and functions; Nhost pairs Postgres with a Hasura GraphQL layer. Best when you want Supabase-style breadth with the option to self-host. Watch: self-hosting is real operational work.
Firebase
Google's mature BaaS, NoSQL-first, with excellent mobile SDKs and realtime out of the box. Best for mobile apps and teams happy in the Google ecosystem. Watch: the NoSQL model and query limits bite once your data is relational.
When to stay on Supabase
If you want Postgres with auth, storage, realtime, and edge functions in one open-source platform, Supabase is still the most complete answer. Leave only when you need just the database (Neon) or a fundamentally different model (Convex, Firebase).
FAQ
What is the best open-source Supabase alternative?
Appwrite and Nhost are the closest open-source, self-hostable options. Supabase itself is open-source; the reason to move is usually a different architecture, not licensing.
Neon vs Supabase, which should I pick?
Neon if you want serverless Postgres and will provide your own auth and APIs; Supabase if you want Postgres plus auth, storage, and realtime bundled. Neon is a database; Supabase is a backend platform built on one.
Is Firebase better than Supabase?
Different tools. Firebase wins for mobile and NoSQL realtime in the Google ecosystem; Supabase wins when you want relational Postgres, SQL, and an open-source stack. Pick by your data model.
Which has the best free tier?
Supabase, Neon, and Convex all have generous free tiers for prototypes. Supabase gives the most surface area for free (database, auth, storage); Neon is the most generous for pure Postgres.
Related: the serverless databases directory compares these side by side, and best vector database for RAG covers the AI-data angle.