The Best Convex Alternatives

Choose Supabase if...

✓you need Postgres, SQL, and row-level security
✓you want the full stack running locally
✓you prefer modular services over a full platform

Firebase

Choose Firebase if...

✓you’re building a mobile app with Google tooling
✓you need analytics, crash reporting, and notifications
✓you want the fastest auth and realtime setup

Appwrite

4.7 ·

Choose Appwrite if...

✓you want easy self-hosting and data ownership
✓you need backend plus integrated web hosting
✓you want billing caps to avoid surprise costs

Instant

Choose Instant if...

✓you want client-first realtime sync and caching
✓you need offline-friendly data for React Native
✓you want permissions handled with minimal backend code

NestJS

Choose NestJS if...

✓you want full control over backend architecture
✓you’re building complex APIs and microservices
✓you need portability across clouds and databases

What to Consider

Convex has become a go-to for building reactive apps with TypeScript functions and realtime subscriptions baked in, but the alternatives landscape spans very different backend philosophies. Supabase appeals to teams that want Postgres, SQL, and Row Level Security with a strong local-dev workflow; Firebase remains the fastest path to a production-ready mobile stack with analytics, crash reporting, and push; Appwrite emphasizes open-source control and self-hosting (plus integrated hosting); InstantDB leans client-first with sync/caching/permissions abstractions; and NestJS is the “build it yourself” option for maximum architectural control.

In comparing options, we weighed how each approach handles data modeling and access control (SQL/RLS vs document models), realtime and offline collaboration needs, auth and “starter kit” completeness, local development and deployment ergonomics, integration breadth (mobile tooling, hosting, edge/serverless functions), scalability and operational overhead, and the trade-offs around pricing predictability, portability, and lock-in.

Supabase

The open source Firebase alternative

5.0 · 716 reviews

If the priority is a relational database foundation, Supabase stands out by being Postgres-first rather than centering application logic in a managed runtime like Convex. It’s a strong fit when SQL is non-negotiable, complex joins and reporting matter, or the team wants the long-term portability that comes with standard Postgres tooling.

Row Level Security is the big unlock for multi-tenant apps: access rules live next to the data and can be enforced consistently across clients and APIs. That approach can feel more explicit and auditable than app-layer permissions, especially for products with strict data boundaries.

Supabase also shines for its local-first workflow, where teams can run Postgres, auth, storage, and realtime locally and iterate quickly without waiting on a remote environment. And because it’s modular, teams can adopt only what they need—just the database, or database plus auth—without committing to an all-or-nothing backend paradigm.

Best for

Best for teams that want Postgres, SQL, and RLS-driven access control with a flexible BaaS stack.

Standout features

✓Managed Postgres with SQL tooling
✓Row Level Security for fine-grained permissions
✓Realtime subscriptions on database changes
✓Local development stack and dashboard
✓Modular auth, storage, and edge functions

Firebase

An app development platform backed by Google

5.0 · 204 reviews

Firebase is compelling when the product is mobile-first and needs more than just a backend database. It offers an integrated suite—auth, databases, functions, hosting, analytics, crash reporting, and notifications that can reduce the number of separate vendors a team has to stitch together.

The fastest path from prototype to production is where Firebase often beats a more code-centric backend like Convex. Teams can wire up authentication, realtime sync, and serverless functions quickly, which is ideal when shipping speed and iteration cycles matter most.

Firebase’s realtime story is also flexible, with both Firestore and the Realtime Database available depending on latency and sync patterns. For teams already leaning into Google’s ecosystem, the operational maturity and scaling model can be a simpler bet than adopting a newer backend paradigm.

Best for

Ideal for mobile teams and solo developers who want a complete Google-backed app platform end-to-end.

Standout features

✓Auth with many sign-in options
✓Firestore and Realtime Database options
✓Cloud Functions for serverless logic
✓Crash reporting and product analytics
✓Push notifications and mobile integrations

Appwrite

The developers' cloud

4.7 · 30 reviews

Open-source control is the main reason Appwrite enters the conversation against Convex. It’s built for teams that want a Firebase-like developer experience but also want a clear path to self-hosting, data ownership, and easier migration between cloud and on-prem setups.

Appwrite emphasizes an all-in-one platform feel with core building blocks—auth, database, storage, and functions—so teams can ship quickly without assembling infrastructure piece by piece. For simpler web products, having backend services and hosting in the same platform can reduce glue code and deployment complexity.

Cost and operational predictability are also part of the appeal, with guardrails like billing caps helping teams avoid surprises as usage grows. The trade-off is that the platform can feel more constrained than rolling a custom backend, but it’s a strong alternative when control and deployability matter as much as speed.

Best for

Best for teams that want a Firebase-style BaaS with straightforward self-hosting and ownership.

Standout features

✓Self-hostable open-source backend platform
✓Auth, database, storage, and functions included
✓Cloud-to-self-host migration path
✓Integrated web hosting via Appwrite Sites
✓Billing caps for predictable spend

Instant

useState as a backend.

5.0 · 6 reviews

InstantDB takes a client-first approach that can feel closer to “useState, but shared” than a traditional backend. Compared with Convex’s server-side function model, it prioritizes making realtime sync, caching, and permissions feel native in the frontend so product teams can iterate with minimal backend surface area.

That philosophy is especially attractive for apps where collaboration and fast UI feedback loops are core, because the developer experience centers on quickly reading and writing synced data. It can also be a strong fit when offline-friendly behavior is important, since local cache and sync patterns are part of the mental model.

InstantDB is less about choosing a database paradigm (SQL vs NoSQL) and more about removing data-ops friction from everyday product work. If the goal is to move fast on realtime experiences without building a bespoke sync layer, it’s a distinctive alternative to Convex.

Best for

Ideal for frontend-heavy teams building realtime, offline-friendly apps with minimal backend code.

Standout features

✓Client-first realtime sync
✓Built-in caching for fast UI updates
✓Permissions integrated into data access
✓Offline-friendly app behavior
✓React and React Native oriented workflow

NestJS

Building efficient, reliable and server-side applications.

5.0 · 25 reviews