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Case 04 · Next.js
AI Summary Builder App
A custom-built AI web app that interviews an author one question at a time and writes their structured book summary for them — turning a coach-assisted worksheet into a self-serve product.
Next.jsOpenAIVercel AI SDKProduct design
1 sitting
guided AI interview
5→10
paragraph paste-ready output
Custom app
designed, built, shipped
The problem
New authors stalled at the first big task — writing a structured summary of their book. The existing worksheet was manual, intimidating, and ate coaching time walking people through it.
The approach
- →Designed and built a standalone Next.js app — App Router, React, Tailwind, and the Vercel AI SDK with OpenAI — branded to feel native to the client's main product
- →Built an AI interviewer that asks one question at a time, with separate paths for teaching-style books and memoirs
- →Streamed a paste-ready structured summary — 5 paragraphs, expandable to 10 — the author can drop straight into the main platform
- →Handled the API key server-side only and deployed on Vercel
The results
- ✓Authors go from blank page to a finished, paste-ready summary in one guided sitting
- ✓Coaches freed from walking every client through the worksheet by hand
- ✓The client got a real AI product, not just a workflow
“A custom-built AI web app that interviews an author one question at a time and writes their structured book summary for them — turning a coach-assisted worksheet into a self-serve product.”
Author-coaching program
Built with
Next.jsOpenAIVercel AI SDKProduct design
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