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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
1Convex logoConvexFree plan + paidYesWeb, Self-hosted4 of 466.5
2Supabase logoSupabaseFree plan + paidYesWeb, Self-hosted4 of 459.6
3PocketBase logoPocketBaseOpen sourceYesSelf-hosted, Linux, macOS +14 of 457.2
  1. Convex logo

    1. ConvexTop pick

    Best for: TypeScript teams building realtime apps who want the backend to be just functions

    Free plan + paidOpen sourceSelf-hostableWeb, Self-hosted

    66.5

    score / 100

    Why switch from InstantDB

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

    Pros

    • Live-updating queries without writing websocket code
    • End-to-end TypeScript types from database to UI
    • Free tier plus pay-as-you-go for small projects

    Cons

    • Proprietary programming model makes migrating away costly
    • Per-developer pricing on the Professional plan
    • Self-hosting is possible but less documented than the cloud
    Visit Convex 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 Convex a good InstantDB alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Free or $0/month plus pay as you go
    Checked Oct 25, 2026convex.dev(opens source in a new tab)
    Professional plan
    $25 per developer/month
    Checked Oct 25, 2026convex.dev(opens source in a new tab)
    Self-hosting
    Yes
    Checked Oct 25, 2026docs.convex.dev(opens source in a new tab)
    Open source
    Yes
    Checked Oct 25, 2026convex.dev(opens source in a new tab)
  2. Supabase logo

    2. Supabase

    Best for: Developers who want Postgres plus auth, storage and realtime without running servers

    Free plan + paidOpen sourceSelf-hostableWeb, Self-hosted

    59.6

    score / 100

    Why switch from InstantDB

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

    Pros

    • Real Postgres underneath, so SQL, extensions and standard tooling all work
    • Auth, storage, realtime and functions in one dashboard
    • Open source and self-hostable with Docker
    • Large community and many framework guides

    Cons

    • Free projects pause after a week of inactivity
    • Usage charges for compute and egress can be hard to predict
    • Self-hosting the full stack takes real operations work
    Visit Supabase Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    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 Supabase a good InstantDB alternative?

    Verified facts

    4 of 4 verified
    Free plan
    $0/month, 2 active projects
    Checked Oct 25, 2026supabase.com(opens source in a new tab)
    Pro plan
    From $25/month
    Checked Oct 25, 2026supabase.com(opens source in a new tab)
    Free project pausing
    After 1 week of inactivity
    Checked Oct 25, 2026supabase.com(opens source in a new tab)
    License
    Apache-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
  3. PocketBase logo

    3. PocketBase

    Best for: Solo developers and small apps that want a full backend on one cheap server

    Open sourceSelf-hostableSelf-hosted, Linux, macOS, Windows

    57.2

    score / 100

    Why switch from InstantDB

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

    Pros

    • One binary with no external database or dependencies
    • Built-in admin dashboard, auth and realtime
    • Free and MIT-licensed
    • Easy to back up and move between servers

    Cons

    • Scales only on a single server
    • SQLite only, with no plans for other databases
    • No company, hosted cloud or paid support behind it
    • Pre-1.0, so upgrades can include breaking changes
    Visit PocketBase Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    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 PocketBase a good InstantDB alternative?

    Verified facts

    4 of 4 verified
    License
    MIT
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Hosting
    Self-hosted only
    Checked Oct 25, 2026pocketbase.io(opens source in a new tab)
    Database
    Embedded SQLite
    Checked Oct 25, 2026pocketbase.io(opens source in a new tab)
    Scaling
    Single server (vertical) only
    Checked Oct 25, 2026pocketbase.io(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.