StackPrism
Mobile

Tech stack for a mobile app with offline sync (2026)

Field inspection app with offline sync, designed by StackPrism from one sentence: 10 components, a reason for each, and the live checks that watch them.

The stack

  • Next.js
  • Node.js
  • Inngest
  • Clerk
  • SendGrid
  • Supabase
  • PostgreSQL
  • SQLite
  • Sentry
MobileOfflineFlutterUpdated
The idea someone typed
“A field inspection app for iOS and Android built with Flutter. Inspectors fill in checklists and take photos on site with no signal: the app keeps a local database on the phone and syncs it when they’re back online. Managers review the reports in a web dashboard.”

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Start from this stack
goes down

Select a component to see what it does and what it connects to, or pick one above to see what breaks if it goes down. Pinch or use the buttons to zoom.

Why this stack

The Flutter app works against a local SQLite database on the phone, so inspectors can fill in checklists and take photos with no signal. Once the phone is back online, it syncs with a Node.js API, which writes the records to PostgreSQL on Supabase and the photos to Supabase Storage, then triggers Inngest jobs for the work that can wait, such as emailing managers through SendGrid. Managers review reports in a Next.js web dashboard that reads from the same API. Clerk signs people in on both apps, and Sentry reports errors from the phone, the dashboard and the API.

Why each piece

All 10 components on the diagram: what each one does, what it talks to, and what stops if it goes down.

  1. Web Dashboard

    Next.js dashboard. Calls Node.js API (reads), Clerk (auth) and Sentry (errors).

    Nothing else on the diagram depends on it.

  2. Flutter Mobile App

    iOS and Android app. Calls Local SQLite (reads/writes), Node.js API (syncs), Clerk (auth) and Sentry (errors).

    Nothing else on the diagram depends on it.

  3. Node.js API

    In Backend Services

    Central API service. Calls PostgreSQL (queries), Supabase Storage (stores), Inngest (triggers), Clerk (verifies) and Sentry (errors). Called by Flutter Mobile App (syncs) and Web Dashboard (reads).

    If it goes down, 2 of 9 components stop working.

  4. Inngest

    In Backend Services

    Async sync jobs. Calls SendGrid (emails). Called by Node.js API (triggers).

    If it goes down, 1 of 9 components degrades.

  5. Clerk

    In External Services

    Authentication service. Called by Flutter Mobile App (auth), Web Dashboard (auth) and Node.js API (verifies).

    If it goes down, 3 of 9 components stop working.

  6. SendGrid

    In External Services

    Email notifications. Called by Inngest (emails).

    If it goes down, 1 of 9 components degrades.

  7. Supabase Storage

    In Data & Storage

    Photo storage. Called by Node.js API (stores).

    If it goes down, 1 of 9 components degrades.

  8. PostgreSQL

    In Data & Storage

    Supabase database. Called by Node.js API (queries).

    If it goes down, 3 of 9 components stop working.

  9. Local SQLite

    In Data & Storage

    On-device database. Called by Flutter Mobile App (reads/writes).

    If it goes down, 1 of 9 components stops working.

  10. Sentry

    Error tracking. Called by Node.js API (errors), Flutter Mobile App (errors) and Web Dashboard (errors).

    If it goes down, 3 of 9 components degrade.

When this stack fits

  • People work where there’s no signal and can’t lose an inspection to a dropped connection.
  • One Flutter codebase for iOS and Android.
  • Records and photos sync separately: PostgreSQL for the data, storage for the files.

When to pick something else

  • Two people edit the same record offline: you need conflict rules, or a sync engine built for it, beyond a plain sync endpoint.
  • Your team knows React: React Native with Expo covers the same ground, as in the habit tracker example.

What you need to build this

10 components across 7 areas of the stack.

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Frontend2

  • Web Dashboard · Next.js

    Next.js dashboard

    npm install next

    Docs

  • Flutter Mobile App

    iOS and Android app

Backend & APIs2

  • Node.js API

    Central API service

    Docs

  • Inngest

    Async sync jobs

Data2

  • Local SQLite

    On-device database

    Docs

  • PostgreSQL

    Supabase database

    Docs

Auth1

  • Clerk

    Authentication service

    npm install @clerk/nextjs

    Docs

Email & messaging1

  • SendGrid

    Email notifications

    npm install @sendgrid/mail

    Docs

Storage & CDN1

  • Supabase Storage

    Photo storage

    npm install @supabase/supabase-js

    Docs

Observability1

  • Sentry

    Error tracking

    npm install @sentry/nextjs

    Docs

Install

npm install next @clerk/nextjs @sendgrid/mail @supabase/supabase-js @sentry/nextjs

SDKs only. Pick your own database driver or ORM.

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