7 Best Firebase Alternatives in 2026 (Compared)

Most “firebase alternatives” lists are SEO filler that rank ten products without using any of them. We ship Flutter apps on these backends for clients, so this is the working shortlist — seven real Firebase alternatives, what each is actually good at, and the one column most lists skip: how well it works with Flutter.

The honest headline: Supabase is the default Firebase alternative for most teams, because it swaps Firestore’s NoSQL for real Postgres while keeping the convenience layer. But “best” depends on whether you want a Firebase-like document model, a SQL database, or a self-hosted single binary. Here’s the full picture.

Why teams leave Firebase

Three reasons drive almost every Firebase migration we’re asked to do, and they’re worth naming because they tell you which alternative fits.

First, cost unpredictability — Firestore bills per document read/write, so a read-heavy screen can produce a bill nobody forecast. Teams want flat, compute-based pricing. Second, no SQL — Firestore is a document store, so anything relational (joins, aggregates, reporting) is painful, and teams with real relational data hit a wall. Third, vendor lock-in — Firestore is proprietary; you can’t self-host it or take your database elsewhere without a rewrite. If even one of these is your pain, an alternative below solves it.

A concrete example from a build we inherited: a food-ordering app opened its order-list screen with a Firestore query that read ~180 documents per open, no pagination. At 12,000 daily opens that’s 2.16M reads/day — about $1.30/day on reads alone for one screen, before everything else. Moving that to a single paginated Postgres query on a $25/month Supabase instance dropped the marginal read cost to effectively zero. That’s the shape of why teams switch: it’s rarely one big reason, it’s the bill creeping past predictable.

Open source vs managed: two kinds of Firebase alternative

There’s a fork in the road before you pick a specific tool. An open source firebase alternative (Supabase, Appwrite, PocketBase, Nhost, Parse/Back4App) gives you the source code and the option to self-host — run it on your own server and your costs are basically the VPS bill. A managed-only alternative (Convex, AWS Amplify) is faster to start but keeps you on someone else’s billing meter, same as Firebase.

For teams whose whole reason for leaving is cost or lock-in, a self hosted firebase alternative is the real answer: Appwrite or PocketBase on a $10–$20/month VPS serves a small-to-mid app at a flat, knowable cost Firebase can’t match once you have traffic. The trade is operational — you own uptime, backups, and updates. Funded teams usually prefer managed Supabase ($25/mo) to skip that; bootstrappers self-host and pocket the difference. Five of the seven below are open source; two are managed-only. We’ll flag which is which.

The 7 best Firebase alternatives, compared

1. Supabase — the default pick

Open-source Postgres with auth, realtime, storage, and edge functions on top. You get a real SQL database with row-level security, flat $25/month Pro pricing, and the option to self-host because it’s just Postgres. The supabase_flutter SDK covers auth, realtime, and queries cleanly. The trade vs Firebase is offline — there’s no first-party offline cache as polished as Firestore’s. For relational apps (marketplaces, delivery, SaaS), it’s the strongest all-round Firebase alternative. We compare the two in depth in supabase vs firebase.

2. Appwrite — the closest feel to Firebase

If you like Firebase’s document model but want open-source and self-hosting, Appwrite is the nearest match. Collections-and-documents API, built-in auth with 30+ OAuth providers, storage, functions, and an official Flutter SDK. Self-host it on a $5–$20/month VPS and your costs are basically fixed. It’s our pick when a team wants “Firebase but mine.”

3. AWS Amplify — if you already live on AWS

Amplify wraps DynamoDB (or Aurora), Cognito auth, AppSync GraphQL, and S3 into a Firebase-like developer experience. Worth it mainly if you’re already committed to AWS and want everything in one account. The Amplify Flutter packages work but the learning curve and AWS billing complexity are real. Overkill for a small app.

4. PocketBase — the smallest, simplest option

A single ~15 MB Go binary with an embedded SQLite database, auth, realtime, file storage, and an admin UI. You run one file. For prototypes, internal tools, and small apps it’s astonishingly low-friction and free (you just pay for the server). It doesn’t scale to millions of users the way Postgres does, but most apps never need that.

5. Nhost — Postgres + GraphQL

Nhost is Postgres (like Supabase) but with a GraphQL-first API via Hasura. If your team already speaks GraphQL, the developer experience is excellent — instant typed GraphQL over your schema, plus auth and storage. Flutter talks to it via any GraphQL client. Smaller community than Supabase, but a genuinely good option for GraphQL shops.

6. Convex — reactive, document-first

Convex is a managed reactive backend where your queries auto-update like Firestore listeners, with a TypeScript-native function model. It’s elegant for realtime web apps. The Flutter story is earlier than the others (community SDK), so we’d only reach for it on a Flutter project if the team had a strong reason. One to watch.

7. Back4App — managed Parse

Back4App is a managed host for the open-source Parse Platform (which itself was the original “Firebase alternative” after Facebook open-sourced it). Parse has a mature Flutter SDK, and Back4App offers both NoSQL and Postgres options. A solid choice if you want Parse without running it yourself.

The best Firebase alternative for Flutter

Since we ship Flutter, here’s the mobile-specific read most lists skip. The best firebase alternative for flutter comes down to SDK maturity:

• Supabase — supabase_flutter is well-maintained: auth, realtime, Postgres queries, and storage all work cleanly from Dart. Strongest SQL option for Flutter.
• Appwrite — ships an official Flutter SDK (Appwrite maintains it), covering auth, databases, storage, and functions. The closest Firebase-like Flutter experience, and self-hostable.
• Parse/Back4App — the parse_server_sdk_flutter package is mature; Parse has been a Flutter backend for years.
• AWS Amplify — Amplify Flutter is official but heavier; worth it only if you’re already on AWS.
• Nhost / Convex / PocketBase — work via GraphQL or community SDKs; usable, but less first-class than the top three.

The one thing none of them match yet is Firestore’s offline cache. If your Flutter app must work fully offline, that’s the single feature keeping teams on Firebase — every alternative needs a local-SQLite mirror (Drift) or a sync package to get close. For everything else, Supabase or Appwrite is the better long-term call.

How to choose your Firebase alternative

Cut through the list with three questions about your data and your constraints.

For the apps we build most — delivery platforms, marketplaces, on-demand services with relational data — Supabase is the alternative we recommend by default, with Appwrite the pick for teams that specifically want Firebase’s document model under their own control. If you’re still deciding between staying on Firebase or moving, the head-to-head is in supabase vs firebase.

What migrating actually involves

Whichever you pick, budget for the move if you’re leaving a live Firebase app. The work is roughly: export and re-import users (auth UIDs change), reshape Firestore documents into the new database (the biggest task — relational targets need a real data model), and rewrite Firebase Security Rules as the new platform’s authorization (RLS policies in Supabase/Nhost, collection permissions in Appwrite). FCM push notifications are independent of the database, so those carry over. On a clean Flutter architecture with a repository layer between UI and backend, plan 1–2 weeks for a mid-size app — not a rewrite, but not a weekend either.

We do these migrations and greenfield builds on Supabase, Appwrite, and Firebase regularly; the backend choice is one call inside a broader Flutter development services engagement, and we pick based on your data shape, not a vendor preference.