What it is
An open-source electricity bill splitter that handles the math nobody wants to do. Submeter-based cost splitting (slab-aware), UPI deep-link integration for one-tap payments, and a Lighthouse 100 score across all four categories.
Why I built it
I share an apartment with submeters per room. Splitting the bill correctly means handling tiered slab pricing, distributing the slab-2 surcharge proportional to usage, and tracking who paid what. I was doing this in a spreadsheet every month. SplitWatt is the spreadsheet, but as a real app, with auth and a paste-into-WhatsApp summary.
What's inside
- Slab-aware splitter that handles tiered electricity pricing correctly.
- UPI deep-links for one-tap pay between roommates.
- Better Auth + Postgres for accounts and history.
- Lighthouse 100 across performance, accessibility, best practices, and SEO.
- Umami for privacy-respecting usage analytics.