Writing PRDs & specs
AI is genuinely good at the first 80% of a PRD — structure, edge cases, acceptance criteria, the boring-but-necessary sections. These are the tools that get you from a blank page to a reviewable draft in minutes, so you spend your time on judgment, not formatting.
The trap with AI-written PRDs is shipping the model’s first draft. These tools are for the opposite workflow: get a complete, structured skeleton in two minutes, then spend your saved time pressure-testing assumptions, adding the context only you have, and cutting scope. Our picks are ranked on how well they hold long context, how good they are at structured thinking, and whether they fit where PMs actually write.
1.Claude
5 out of 5 — EssentialLong, structured documents — PRDs, specs, and synthesizing a stack of interviews without losing the thread.
Free tier; Pro $20/mo ($17/mo annual); Max from $100/mo
2.ChatGPT
5 out of 5 — EssentialThe versatile everyday workhorse — drafting specs, quick analysis, and voice-driven interview note capture.
Free (with ads); Go $8/mo; Plus $20/mo; Pro $100–$200/mo; Business from $25/user/mo
3.Notion AI
3 out of 5 — SolidTeams already living in Notion who want AI drafting and Q&A right inside their existing docs.
Bundled into Business $20/user/mo annual ($24 monthly); Custom Agents billed at $10 per 1,000 credits