About Free LLMs for Product Requirement Documents

Based on 2025–2026 evaluations, these are the best top free LLM for writing Product Requirements Documents (PRDs) from the best to the worst:

  • Claude is consistently rated highest for PRD quality. It produces thoughtful, structured, and strategic documents.
  • ChatGPT is an alternative that, with effective prompts, provides high-quality, structured output. However, it may struggle with consistency on very long PRDs compared to Claude.
  • Gemini is a strong contender, especially when using Gemini "Gems" (custom instructions) to create a tailored PRD assistant.

Tips and Tricks Development Documentation Artificial Intelligence Vibe Coding Vibe Engineering

Also by me

Django Messaging

For Django-based social platforms.

Django App for You
Django Paddle Subscriptions

For Django-based SaaS projects.

Django App for You
Django GDPR Cookie Consent

For Django websites that use cookies.

Django App for You
Django 3 Web Development Cookbook - Fourth Edition
Book for You
Django 3 Web Development Cookbook

Learn how to build practical web projects with Django 3.
1st things 1st
SaaS for You
Online prioritizer "1st things 1st"

It's not for everyone, but it might be for you!

Also about Django