Flinch

Hey IH! I'm Haitham, solo founder building Flinch (flinch.cards).

The problem: I'm a US stock day trader who has tried TradeZella, TraderVue, spreadsheets, and a notebook. Quit all of them within a month because manually tagging and journaling every trade is tedious.

What I built: Flinch reads your broker's CSV export and automatically finds behavioral patterns costing you money. Upload one file → see overtrading, revenge trading, size escalation, premature exits → get the exact dollar cost of each pattern.

Zero manual input. Ever.

Tech: Next.js, TypeScript, Supabase, Claude API. Built entirely with Claude Code. 305 tests. 9.5/10 code quality score after 5 automated review rounds.

Business model: $19/mo, 7-day free trial via Whop. Just launched.

What's working: The "Cost of Behavior" number — showing traders exactly how much their habits cost in dollars — is the aha moment.

What I need: First 10 users and feedback.

Would love to hear from other solo founders in fintech or anyone who's built behavioral analysis tools. AMA!