Lighthouse Spec reads your messy product brief — half-formed thoughts, meeting notes, screenshots — and ships back a clean, stakeholder-ready spec your engineers will actually read.
Most product docs leak ambiguity into engineering. Engineers ask the same questions in standup for two weeks while the spec sits half-edited. Lighthouse collapses that loop.
The spec opens with a single, testable goal sentence — not three paragraphs of context. If we can't write it, you don't have a spec yet.
Three honest risks at the top, before the bullet list of features. Most specs hide their risks at the bottom; engineers find them on day 4.
Every spec is constrained to what ships in the first deployable cut. Out-of-scope items go to a separate "later" section, by name, by why.
We read meeting notes, transcripts, Slack snippets, screenshots, half-finished docs. Messier the better.
Day-1 scope, full PRD, RFC, or "engineer brief". Each shape has its own house style — and the house style is opinionated.
You see the draft inline next to the source. Click any sentence to surface the source paragraph. Edit, accept, ship.
Native sync to Notion + Linear, or a clean Markdown export. The spec is owned by you, not by us.
For PMs handling their own brief queue.
For PMs shipping more than they're writing.
For 5+ PMs with shared style.
One free spec, no card. Drop your work email. We email you back within a day with a tightened spec drafted from a doc you send us.
we read your doc once, send the spec back, and delete the source within 7 days.