An Excel formula bot built like a full-stack SaaS thesis

What it does

SmartExcel.cc takes a plain-English description of a spreadsheet problem, constructs a prompt from your input, and streams back an Excel formula generated by the ChatGPT API via a Vercel Edge Function. The app itself is a fully equipped SaaS, with auth, payments, and storage all wired in.

The interesting bit

The spreadsheet magic is almost an afterthought. The real focus is the plumbing: Postgres and Prisma for storage, NextAuth for identity, Lemon Squeezy for billing, Upstash Redis for caching, and Google Analytics for telemetry. The author links to detailed Chinese-language tutorials for each integration and openly treats this repo as a stepping stone to a more advanced starter kit, giving it an honest, educational charm.

Key highlights

• Streams AI responses with the Vercel AI SDK instead of forcing a full round-trip wait.
• Ships with a complete SaaS backbone: auth, payments, database, Redis, and analytics.
• Proxies OpenAI requests through a Vercel Edge Function.
• Explicitly positioned by its creator as a learning project and precursor to a larger template.

Verdict

Worth a look if you want a working diagram of how modern Vercel SaaS pieces snap together. If you just need an Excel formula decoded, you already have a ChatGPT tab open.