Case study

Investment Tracker

Screenshot your broker apps, get one private performance dashboard.

Local-only by design — personal financial data never leaves the machine, so there's no public demo.

A local, password-protected web app that turns screenshots of N26 and Trading212 portfolios into a single performance database in EUR — every position, every account, over time.

The problem

Money split across two brokers with no export makes it hard to know how you're actually doing overall.

The approach

Screenshots are the only input: Claude reads them and extracts positions, which you review before saving.
Two ingest paths: in-app upload with an API key, or a Claude Code command that processes an inbox folder with no key at all.
Each screenshot becomes a dated snapshot; re-ingesting the same account and day safely replaces it.
Everything converted to EUR with ECB rates, and all data stays on the machine by design.

The outcome

Zero-effort tracking of total performance across both brokers.

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