D4T4 – An SQL client with GPT – Natural language to SQL (waitlist open)

Hey HN,

A few months ago, I started building a MySQL client to make my own workflow less painful. I connect to databases a lot and constantly need to generate recurring reports. At some point, I realized I was spending too much time rewriting similar SQL queries — and kept using GPT to help. But GPT didn’t know my schema or what I was trying to ask. So I added a feature that gives GPT the necessary schema context before generating SQL from natural language prompts. It worked well enough that I started using it daily. That little idea became d4t4.app — a lightweight, JavaScript-based MySQL client with GPT baked in. You can just type what you want to see, and it gives you the SQL.

– All queries run locally – GPT only sees your prompt, not your data – The UI is minimal and fast

I'm working on PostgreSQL and MSSQL support next. During the waitlist phase, I’m offering early access and usage credits in exchange for feedback. Here’s a short 18-second teaser: → https://d4t4.app Would love to hear your thoughts — especially around use cases, feature ideas, or annoyances you’ve had with other SQL tools. Thanks!