Best Backend for Mobile Apps in 2026

A mobile backend is the hosted database, sign-in, file store and push layer a phone app talks to over one SDK, so the first release ships without a server to patch. The shortlist for a phone client is not the shortlist for a web app: a backend that cannot survive a tunnel is the wrong backend, and most hosted databases still assume a browser with a connection.

This page ranks eight backends on what a mobile team feels first: an offline story, push notifications, native SDKs for Swift, Kotlin, Flutter and React Native, and a bill that scales with users rather than with developers. The broader backend-as-a-service ranking covers the web-first picks and the self-hosted exits.

Toolradar data: Toolradar, the software directory we run, evaluated 114 tools in its low-code backend ranking updated on October 15, 2026. That list is dominated by enterprise app builders, which is why this page is a mobile cut of the market and not a reprint of it. Prices below were verified on each vendor's pricing page in October 2026.

You are buying four things with one SDK: a data store, user sign-in, files, and a way to reach the phone when the app is closed. Offline sync is where the eight differ most. Firebase ships a local Firestore cache that is enabled by default on Android and Apple. PowerSync and Ditto put a full SQLite or document store on the device and reconcile it with the server. Supabase, Appwrite, Back4app and Convex expose an online API, so offline behaviour is something you build with a local cache.

The second difference is the database under the API. Supabase and PowerSync's default source are Postgres, so a relational schema moves with a dump. Firestore and Convex are document stores with their own query models, and Amplify Data sits on AppSync and DynamoDB, so leaving means an export and a rewrite.

The third difference is the meter. Firebase, Amplify and Back4app bill usage with no seat, so a two-person studio pays the same platform rate as a ten-person one. Convex Professional is billed per developer per month, which flips that math the moment the team grows. Supabase, Appwrite and PowerSync bill one organization or project subscription plus usage above the included quota.

How we compared: we read the eight vendors' own pricing and docs pages in October 2026 and ranked them for a team shipping a phone app, weighting offline behaviour, push, native SDK coverage and the first-year bill over web features. This is a reading of vendor pages, not a benchmark.

The mistake mobile teams make is to pick the backend for the prototype and discover the production bill at review time. Firebase Spark cannot deploy a Cloud Function: the moment server-side logic is needed, the project moves to Blaze, where Firestore bills $0.03 per 100,000 reads and $0.09 per 100,000 writes above the daily free quota. A chatty list screen that reads every row on every open can cost more than a Supabase Pro plan.

The second trap is the idle pause. Supabase, Appwrite and PowerSync all pause or deactivate a free project after one week of inactivity, so a TestFlight build sent to a client on Friday can open against a sleeping database on Monday. A paid plan on any of the three removes the pause, which is often the real reason a team upgrades, not the quota.

The third trap is the seat. A Convex team of six on Professional pays six times the per-developer rate, while a six-person team on Supabase Pro pays the organization rate once plus compute. For a mobile studio where contractors come and go, the per-developer meter is a budgeting problem before it is a technical one.

The cheapest production backend for a mobile app is Firebase Blaze with a small read budget, because the platform charges nothing and the Spark quotas keep applying. The catch is behaviour, not price: a screen that reads 1,000 documents per open for 10,000 daily users is 10 million reads a day, and at $0.03 per 100,000 reads that is $3 a day before writes and storage. Model the reads before you trust the free tier.

The flat entry plans cluster at the same number. Supabase Pro and Appwrite Pro share one $25/mo organization price, and Back4app MVP costs $15 billed annually or more on monthly billing. They are not the same purchase: Supabase then meters compute from $10/mo per instance, Appwrite meters bandwidth and storage above 2 TB and 150 GB, and Back4app meters requests above 500,000 a month.

Offline sync is a second line. PowerSync Pro at $49/mo sits on top of the database you already pay for, so a Supabase plus PowerSync stack starts at $74/mo before compute. Ditto's free plan covers 10 devices, and the production tiers have no public price, so plan a quote before the pilot ends.

Prices were checked in October 2026 on Firebase pricing, Firestore pricing, Supabase pricing, Appwrite pricing, PowerSync pricing, Amplify pricing, Back4app pricing, Convex pricing and Ditto pricing. The Supabase pricing explainer walks through the compute add-ons in more detail.