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InstantDB alternatives: 4 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave InstantDB: hosted cloud closed to new users and shutting down, and future development depends on the community. We ranked 4 alternatives by how directly each one replaces InstantDB, then by reviews, real visits and how recently each app's facts were checked against its own website. Convex currently ranks first.

InstantDB has been acquired. The Instant team joined OpenAI in 2026; Instant Cloud is closed to new signups and shuts down on 31 August 2027. The code stays open source.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Firebase logoFirebaseFree plan + paidNoWeb, iOS, Android4 of 462.6
  1. Firebase logo

    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

    62.6

    score / 100

    Why switch from InstantDB

    Realtime sync and offline support on a long-running managed platform.

    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 ×0.387
    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 InstantDB 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 InstantDB alternative for…

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

Convex logo

Best InstantDB alternative for most people

Convex

Managed reactive backend with live queries, the closest hosted replacement.

PocketBase logo

Best InstantDB alternative for a free option

PocketBase

Small self-hosted backend with realtime subscriptions if you are self-hosting anyway.

Firebase logo

Best InstantDB alternative for a free plan you can upgrade

Firebase

Realtime sync and offline support on a long-running managed platform.

Supabase logo

Best InstantDB alternative for open source

Supabase

Postgres with realtime subscriptions and a large, stable company behind it.

Convex logo

Best InstantDB alternative for self-hosting

Convex

Managed reactive backend with live queries, the closest hosted replacement.

PocketBase logo

Best InstantDB alternative for Mac

PocketBase

Small self-hosted backend with realtime subscriptions if you are self-hosting anyway.

PocketBase logo

Best InstantDB alternative for Windows

PocketBase

Small self-hosted backend with realtime subscriptions if you are self-hosting anyway.

PocketBase logo

Best InstantDB alternative for Linux

PocketBase

Small self-hosted backend with realtime subscriptions if you are self-hosting anyway.

Firebase logo

Best InstantDB alternative for iPhone and Android

Firebase

Realtime sync and offline support on a long-running managed platform.

Convex logo

Best InstantDB alternative for working in the browser

Convex

Managed reactive backend with live queries, the closest hosted replacement.

InstantDB alternatives: common questions

What is the best alternative to InstantDB?

Convex ranks first right now. Managed reactive backend with live queries, the closest hosted replacement. Firebase and Supabase follow it in our ranking.

Is there a free alternative to InstantDB?

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

Is there an open-source alternative to InstantDB?

Yes: Convex, Supabase and PocketBase. Convex, Supabase and PocketBase can also be self-hosted.

Which InstantDB alternatives work on Linux?

PocketBase runs on Linux.

Why do people switch from InstantDB?

The complaints we hear most: hosted cloud closed to new users and shutting down; future development depends on the community; self-hosting a sync engine is real operational work.

How is this list ranked?

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