Convex alternatives: 5 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Convex: proprietary programming model makes migrating away costly, and per-developer pricing on the Professional plan. We ranked 5 alternatives by how directly each one replaces Convex, then by reviews, real visits and how recently each app's facts were checked against its own website. Firebase currently ranks first.

Quick comparison

#	App	Pricing	Open source	Platforms	Verified facts	Score
1	Firebase	Free plan + paid	No	Web, iOS, Android	4 of 4	66.5

1. FirebaseTop pick
Best for: Mobile and web teams who want realtime sync, auth and push messaging from one vendor
Free plan + paidWeb, iOS, Android
66.5
score / 100
Why switch from Convex
Realtime sync with a far bigger ecosystem and mobile tooling.
Pros
Mature SDKs for Android, iOS, Flutter and web
Realtime sync and offline support built into the client libraries
Wide set of mobile services such as crash reporting and push messaging
Cons
Ties your app closely to Google Cloud
NoSQL query limits often force data duplication
Pay-as-you-go bills can spike with heavy reads
Visit Firebase Details and reviews
How this score is calculated
Editorial fit ×0.3100
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.1585
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Firebase a good Convex alternative?
Verified facts
4 of 4 verified
Free plan
Spark plan (no-cost)
Checked Oct 25, 2026firebase.google.com(opens source in a new tab)
Paid plan
Blaze, pay as you go
Checked Oct 25, 2026firebase.google.com(opens source in a new tab)
Database
Firestore, a NoSQL document database
Checked Oct 25, 2026firebase.google.com(opens source in a new tab)
SQL option
PostgreSQL via Firebase SQL Connect
Checked Oct 25, 2026firebase.google.com(opens source in a new tab)

The best Convex alternative for…

The highest-ranked app in this list for each need.

Best Convex alternative for most people

Firebase

Realtime sync with a far bigger ecosystem and mobile tooling.

Best Convex alternative for a free option

InstantDB

Similar realtime, client-first model with an open-source engine you can self-host.

Best Convex alternative for a free plan you can upgrade

Supabase

SQL and Postgres if you prefer a standard database you can take elsewhere.

Best Convex alternative for open source

Appwrite

Open-source backend with conventional REST and SDK APIs instead of a custom model.

Best Convex alternative for self-hosting

Supabase

SQL and Postgres if you prefer a standard database you can take elsewhere.

Best Convex alternative for iPhone and Android

Firebase

Realtime sync with a far bigger ecosystem and mobile tooling.

Best Convex alternative for working in the browser

Gadget

Another TypeScript-centric hosted backend with built-in hosting and integrations.

Convex alternatives: common questions

What is the best alternative to Convex?

Firebase ranks first right now. Realtime sync with a far bigger ecosystem and mobile tooling. Supabase and InstantDB follow it in our ranking.

Is there a free alternative to Convex?

Yes. Firebase (free plan + paid), Supabase (free plan + paid), InstantDB (open source) and Appwrite (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Convex?

Yes: Supabase, InstantDB and Appwrite. Supabase, InstantDB and Appwrite can also be self-hosted.

Why do people switch from Convex?

The complaints we hear most: proprietary programming model makes migrating away costly; per-developer pricing on the Professional plan; self-hosting is possible but less documented than the cloud.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Convex, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.