Now in beta for macOS and Windows
You've built the context layer. Now put people through it.
Subjourney turns your docs and diagrams into journeys that simulated personas walk step by step. They show you where they get stuck, what's missing, and what doesn't add up, so your team and your agents build toward outcomes that hold up.
Your docs are instructions. Now you can run them.
Specs, policies and PRDs are what your organisation runs on, for people and now for agents too. But checking them still means a read-through, a review meeting, and a gut feel.
As AI writes more of them, faster, that gap only grows. The first real test of a doc is usually a customer, a new hire, or an agent getting it wrong in production.
Test your context to see where it bends or breaks.
For anyone whose docs have to work.
Run the PRD before engineering builds it.Product teams
Solo userSubscriber
Switching to annual billing.
- Motivation
- Lock in the annual discount now the tool is part of every week.
- Frustration
- Being charged twice when a plan changes mid-cycle.
- Need
- A plain note on what happens to the month already paid.
- Age29
- Income$58,000
- EducationBachelors Degree
- EmploymentEarly Career
- Communication styleCasual
- Social engagementActive Contributor
- Risk appetiteRisk-Tolerant
- Eco awarenessEco-Conscious
- Work-life balanceFlexible
- Brand loyaltyActive Loyalty
- Price sensitivityValue Seeker
- Tech adoptionEarly Adopter
- Tech literacyAdvanced
Every step is a sentence, grounded in your sources.
Actor
Who acts
Action
What they do
Thing
What they act on
Channel
How it reaches them
System
What makes it work
Place
Where it happens
Not another AI review. Where it broke, why, and the paragraph behind it.
- Missing
The doc never covers this case.
- Ambiguous
The doc covers it two ways, or not clearly enough to act on.
- Contradictory
Two docs disagree, and the persona can't satisfy both.
- Dead end
A path that leads nowhere near the promised outcome.
Don't wait for a finished spec.
Run on a rough draft. Let the stalls show you what to write next. Coverage comes from running, not from guessing what's missing.
Press play on your first doc in minutes.
See what happens when someone actually tries to follow it. Bring a doc you already have.