This is a submission for the Gemma 4 Challenge: Build with Gemma 4
What I Built
Swipey, a local-first, privacy focused web app for people juggling multiple credit cards across multiple banks. Drag in a CSV of transactions from Chase or Capital One, pick a month, and Gemma 4 produces a digest of that month's spending: a spotlight, a few patterns, and a few suggestions. It also proposes "groups" that bundle similar transactions and sum the spend, which you can edit inline.
The problem: I have four credit cards. I enjoy collecting credit card reward points (anyone else?!) to help subsidize travel costs 1. This usually means chasing different category bonuses on each (one for dining, another for travel, a third for everything else). Past two or three cards, no single bank app shows you the whole picture, and the interesting questions ("what was my biggest category this month?", "how does this compare to last month?") get hard to answer.
The first version shipped transaction-level data to Claude every month. Swipey on Gemma 4 keeps the same workflow but runs inference on Cloudflare Workers AI.
