Building field apps that work without signal
A field app that requires connectivity is a form that loses work. Offline-first is a design decision about where truth lives, not a caching feature added at the end.
Local write, queued sync
Writes should land in local storage immediately and sync when a connection returns. The interface must show three states honestly: saved locally, syncing, synced. Hiding that difference is how users lose trust.
Conflicts need a rule
Decide per entity whether last write wins, whether the server rejects stale updates, or whether a human resolves. For stock counts and payments, human review is usually safer than silent overwrite.
Test on the network you are avoiding
Test with airplane mode, high latency and interrupted uploads, including the case where a photo upload succeeds but the record update fails. Most offline bugs appear in these gaps rather than in clean offline use.
Common questions
- How much data can an offline app store?
- Enough for the working day, not the year. Scope downloads to the assigned route or region so initial sync stays fast.
- Do offline apps need a backend change?
- Usually yes: idempotent writes, timestamps and version fields so the server can detect and reconcile stale updates.
Next step
If this question is live in your business right now, describe the situation and you will get a written view on the options, including whether you should build at all.
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