AppealBase

Appeal decisions offer valuable precedent for planning hearings and inquiries, but inspector reasoning is often locked away in PDFs.

AppealBase is an award-winning† 100% vibe-coded project that makes that reasoning easy to find and cite: a searchable web interface, an API, a customised ChatGPT app, and an MCP (Model Context Protocol) server.

The result is grounded support for planning lawyers, local authority counsel, planning officers, developers, and agents—AI or non-AI. No hallucinated appeal references, no manual trawling through PDFs, just reliable precedent at speed.

† Winner of the 2025 UK PropTech Association Data Utlisation & Enrichment Award

• Web search: https://www.appealbase.com

• Citation checker: https://www.appealbase.com/citation-checker

• Custom GPT: https://chatgpt.com/g/g-6917102fe9b08191b3c9ed9e7cf4b5af-appealbase-planning-research-assistant

• API: https://www.appealbase.com/api-info

• Technologies used: NextJS – PostgreSQL

• Tools used: Cursor – GitHub – Supabase – Vercel

Planning Lawyers/Barristers: We invite anyone working in planning law to give AppealBase a try (it's completely free to sign up and use).

LegalTech Developers: We are also looking to collaborate with other developers who could incorporate our data (over 90,000 full texts of decisons + metadata) into their applications.

Advisors and Investors: Always welcome! ;-)