What an offline-first portfolio tracker is — and why it matters

The document you're handing over

Think about what a portfolio tracker knows once you've set it up properly: every broker and exchange you use, every wallet, how much is in each, what you bought and when, and your total net worth. Combined with the email it's tied to, that is a precise map of your assets and where to find them.

Account-based trackers store that map on their servers. Usually with good intentions and reasonable security. But it exists there, and things that exist can be breached, subpoenaed, sold as part of an acquisition, monetised in a pivot, or lost when the company shuts down. Several well-known trackers have done at least one of those in the last five years.

What offline-first actually guarantees

Offline-first means the device is the source of truth. Concretely, in Nudge Invest:

• Holdings, transactions, exchange rates, snapshots and chat history are stored in a local SQLite database inside the app.
• There is no account, so there is no user record to associate the data with.
• There is no sync server, so there is no second copy.
• There is no analytics or crash-reporting SDK sending telemetry by default.
• Uninstalling the app, or wiping it in Settings, removes the data. Nothing remains to “request deletion” of.

The one deliberate exception is the optional AI coach. When you ask it something, the categories of data you have enabled — and only those — are sent through the developer's proxy to the model provider for that request. Free-text notes and web search are off by default. Price refresh sends ticker symbols and nothing about quantities. You can see exactly what's enabled in Settings → AI privacy, and turn it all off.

What you give up

Honesty matters here, because the trade is real.

• No automatic broker sync. Transactions are typed, imported from CSV, or read from a statement by the coach. For a long-term investor that's minutes a month; for an active trader it's a chore.
• No cross-device sync. Your phone is the ledger. Moving to a new phone is a CSV export and import.
• Prices don't update themselves. You enter them, or ask the coach to fetch them. The app is a ledger of what you own and paid, not a live ticker.

Who this is for

People who hold across several custodians and want one honest picture without giving anyone the keys. People who have watched an exchange or a fintech disappear and don't want their records to go with it. People who simply think a complete list of their assets is nobody else's business.