Offline Note-Taking App with Sync Dashboard

Students take notes in lectures with patchy Wi-Fi, in metros, in libraries — and the notes that matter are captured in the moment. Cloud-only note apps fail exactly there: no network means no capture, or worse, silently lost edits. This project is built offline-first from the ground up: the editor writes to the local database on every change, a sync queue records each mutation with a sequence number, and when the network returns the queue replays in order against the server. The sync centre makes the invisible visible — pending-change counts, sync progress, last-sync time per linked device — and a conflict-review screen handles the hard case: the same note edited on two devices before either synced. Both versions are kept and the user chooses, instead of silent last-writer-wins data loss.

1. The user writes a note; the editor saves it to the local database immediately, with or without network.
2. Each change is appended to the sync queue with a sequence number and the device ID.
3. When connectivity is available, the queue replays in order; server acknowledgements advance the high-water mark.
4. The sync centre shows live progress: how many changes are pending, what percentage has synced, and each linked device's last-sync time.
5. If a note was edited on two devices since the last sync, both versions are kept and flagged in the conflict-review screen.
6. The user picks the winning version per conflict; the choice syncs and the dashboard returns to a clean state.

Tech stack:

• Android (Kotlin or Java) with Android SDK
• SQLite via Room for local storage
• WorkManager for background sync replay
• REST sync API (version vectors per note)
• Full-text search index (FTS)

• [Rich-text note editor] Bold, italic, headings, bullet lists and checklists with instant local save on every change — no save button, no lost text.
• [Tags and full-text search] Organize notes with tags and find anything instantly through indexed search across titles and bodies.
• [Offline-first sync queue] Every mutation is queued with a monotonically increasing sequence number and replayed in order when the network returns.
• [Sync centre dashboard] Pending-change counts, sync progress bar, last-sync timestamps per linked device and an honest online/offline indicator.
• [Conflict detection and review] Notes edited on two devices before syncing are both preserved and shown in a review screen where the user picks which version to keep.
• [Multi-device linking] Link a phone, laptop and tablet to one account; each device's sync state is tracked independently.
• [Pending-change badges] Notes with unsynced edits are badged in the list so the user always knows what hasn't reached the server yet.

• Complete Android app source code (editor, sync engine, sync centre UI)
• Sync-protocol documentation (queue format, version vectors, conflict rules)
• Sample note dataset for demonstration
• Setup guide (build, install, configure sync server)
• Project report PDF (background, offline-first design, methodology)
• PPT presentation for final review
• Viva Q&A preparation document (Android, SQLite, sync and conflict resolution)

• Multi-device sync needs the companion server endpoint; without it, the app works as a single-device offline notes app.
• Conflict review is manual — the app never auto-merges note bodies, so heavy multi-device editors will see review prompts.
• Attachments are limited to text notes in this build; image and file attachments are future scope.
• Real-time collaborative editing (two cursors in one note) is not implemented; sync is asynchronous.
• Full-text search covers note content only, not attachment contents.