Show HN: InstaTrack: open-source, privacy-first Instagram analytics (local)

Open source tool to analyze Instagram followers/following. Zero server-side data: all processing happens in your browser (localStorage).

What it does:

- Upload Instagram JSON exports

- See who doesn't follow you back and vice versa

- Track trends over time with multiple snapshots

- Export/backup your data

Stack: Next.js 15 + TypeScript + shadcn/ui + Recharts

Why I built it: Instagram doesn't give visibility into this data and existing apps always require account access or send data to their servers. This is fully client-side.

Limitations:

- Manual Instagram data export required each time

- I have few followers, so haven't tested with large datasets (10k+ followers). would appreciate feedback on performance if you try it

Open to feedback on UX and missing features