TheySaid 4.0
Tests your designs with real or AI-simulated users automatically when a ticket hits Design Done.
TheySaid runs usability tests on whatever you're building — inside Claude, v0, Replit, Cursor or Lovable — using either recruited human testers or synthetic users trained on your own customer data. It triggers automatically when a ticket reaches "Design Done," attaches findings and a fix-it prompt to the ticket, and needs no credit card to start. The company publishes its own accuracy numbers from 10 side-by-side studies: synthetic and human testers agreed on 79% of issues, with synthetic catching 10% that humans missed and humans catching 11% that synthetic missed.
What holds up
- +Publishes its own accuracy data: 79% agreement between synthetic and human testers across 10 studies
- +Triggers on "Design Done" automatically — no one has to remember to run a test
- +No credit card needed and first test finishes in under 5 minutes
- +Synthetic testers train on your own customer data, not generic personas
Mind the limits
- −By its own numbers, synthetic testers alone miss 11% of issues that only humans catch
- −Needs your real customer data (calls, surveys, tickets) to tune synthetic testers well
- −Works inside specific tools (Claude, v0, Replit, Cursor, Lovable) — others aren't mentioned
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