The product
TinyNotie began as a way to split trip costs with friends and grew into a full expense platform: groups, trips, receipt scanning, translation for foreign receipts, and an AI chat grounded in your own transaction history.
Receipt pipeline
A photographed receipt runs through OCR, then an LLM pass normalizes the mess: vendor names, line items, currency, tax. Korean receipts get translated inline, which turned out to be the killer feature for expat users. Confidence scores decide whether a human needs to confirm before the expense posts.
AI chat over your money
"How much did we spend on food in Busan?" is a retrieval problem, not a chatbot problem. The chat compiles questions into structured queries against the expense database and only uses the LLM to phrase the answer. No hallucinated totals.
Auth and sharing
Groups needed real authentication with lightweight onboarding. NextAuth handles social sign-in; invite links carry scoped tokens so a friend can join one trip without seeing your other groups.