Prefolk
Paste a URL and AI personas explore your product in a real browser, then report every place they got confused, stuck or gave up, before real customers do.
- Product
- AI user-testing SaaS
- Built with
- Next.js, FastAPI, PostgreSQL
from a URL to a scored report
ready-made personas, plus your own
report with evidence for every finding
The problem we set out to solve.
Prefolk is an AI user-testing product. A cast of AI personas explores your site with a goal in mind. They hesitate and give up in the same places real people do, and Prefolk hands back scored, evidence-backed findings.
- Real user testing costs $50–100 per tester and takes weeks to organise.
- Friends and early supporters say “looks great” because they are being kind.
- One “average user” misses the point: a rushed founder, a non-technical customer and a skeptical developer leave for different reasons.
Every part, built to work in the real world.
Personas that browse for real
Each persona drives a real browser towards a goal and captures a screenshot before every action.
Reports tied to evidence
Every finding links to the moment it happened, what went wrong and the next move, rolled into a first-impression score.
Workspaces and teams
Personal and team workspaces with roles and email invitations.
Auth built from scratch
Email and password with verification, rotating refresh tokens, Google sign-in and argon2id hashing.
Usage that never drifts
Session credits are reserved when a test starts and settled when it finishes.
Admin with an audit trail
Cross-workspace admin tools where every privileged action is recorded.
A Next.js 16 frontend and a FastAPI backend in one repository. Routes translate HTTP, services hold the business rules, and every request runs in a single database transaction. Browser sessions run in their own isolated worker, so slow sites never block the API.
- Next.js 16 & React 19Marketing site, product app and admin
- FastAPI & SQLAlchemy 2API, services and data access
- PostgreSQL on SupabaseData, with Alembic migrations
- browser-use & PlaywrightPersonas driving a real browser
- Supabase AuthGoogle sign-in via PKCE
- ReportLabPDF export of reports
Authentication, workspaces, personas, plans, usage accounting, the browser worker and reports are all working. Payments are the next milestone.
T's Café
Restaurant ordering & booking app
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Tell us what you want to build. You'll get a clear plan, a timeline and a fixed price within a week.