InstantDB alternatives: 4 apps ranked by verified data
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.
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Show all 4 alternativesThe best InstantDB alternative for…
The highest-ranked app in this list for each need.
Best InstantDB alternative for most people
ConvexManaged reactive backend with live queries, the closest hosted replacement.
Best InstantDB alternative for a free option
PocketBaseSmall self-hosted backend with realtime subscriptions if you are self-hosting anyway.
Best InstantDB alternative for a free plan you can upgrade
FirebaseRealtime sync and offline support on a long-running managed platform.
Best InstantDB alternative for open source
SupabasePostgres with realtime subscriptions and a large, stable company behind it.
Best InstantDB alternative for self-hosting
ConvexManaged reactive backend with live queries, the closest hosted replacement.
Best InstantDB alternative for Mac
PocketBaseSmall self-hosted backend with realtime subscriptions if you are self-hosting anyway.
Best InstantDB alternative for Windows
PocketBaseSmall self-hosted backend with realtime subscriptions if you are self-hosting anyway.
Best InstantDB alternative for Linux
PocketBaseSmall self-hosted backend with realtime subscriptions if you are self-hosting anyway.
Best InstantDB alternative for iPhone and Android
FirebaseRealtime sync and offline support on a long-running managed platform.
Best InstantDB alternative for working in the browser
ConvexManaged 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.