A stand-in for your users, at every stage
Cast lifelike users, point them at your product, and get evidence-backed answers in minutes. Here is everything Stunt Double does, from first interview to validation on every change.
Cast lifelike users, point them at your product, and get evidence-backed answers in minutes. Here is everything Stunt Double does, from first interview to validation on every change.
Ask a simulated user about your page and it tells you it loves it. Send an actor through the same page and it shows you where it got stuck, with the screenshots to prove it.
Real browser sessions, real inboxes, real credentials. So you see the step where a user would stop, and the screen they stopped on.
A live map of your product: every page, the paths between them, and what changed in your last release.
See TopologyRunner is your on-call assistant. Ask in plain language and it casts actors, builds checklists, runs automations and finds answers, then takes you straight to the result.
Runner knows every corner of the app and does the work for you, rather than only answering the question.
No forms or menus. Say what you want and Runner works out the steps.
Creates actors, checklists, interviews and automations for you, rather than telling you how.
Sees the page you’re on, so "debug this run" or "fix this check" needs no more context.
⌘I opens Runner from anywhere, ready for whatever’s next.
Ask from Slack, drive a run from Claude, and land the findings in Linear as issues your team can pick up.
Recruit a representative panel, run moderated interviews, and get synthesized findings in minutes, not weeks.


Cast actors that match your audience, each with their own background and device.
Bring a discussion guide or let Stunt Double draft one from your brief.
Transcripts stream in as each session runs: what the actor did, where it stopped and why, with a screenshot of the moment.
A synthesized report of themes, quotes, and ranked recommendations the moment interviews wrap.
Interview Figma prototypes or live products, and actors recall prior rounds to compare cleanly.
Bring actor insights and real human feedback into a single loop.
Capture perspectives from both your AI actors and real human testers in one place.
Enhance prototypes, websites, and designs with annotated feedback that lets your team review, share, and collaborate together.
Get actionable recommendations tied to your goals, ready to action.
Re-run journeys after each iteration to see what improved and what still needs work.
Each actor is an AI user cast for one role, from internal stakeholders to technical end-users, and steps in exactly when its perspective is useful.
Legal reviewer
Claims & terms
Compliance auditor
Policy & regulation
Onboarding expert
First-run journeys
Power-user expert
Advanced flows
Clarity reviewer
Non-technical lens
Stunt Double plugs into the tools you already use. Connect Claude to run your workspace from a conversation, and wire findings into the rest of your stack.
Run your whole workspace from a conversation with the one-click desktop extension.
Push findings straight into your backlog as issues, ready to triage.
Comment on pull requests and tie feedback back to the code that shipped it.
Get run summaries and alerts where your team already talks.
Audition Figma Design, Make and Sites before a single line of code is written.
Kick off a cast on every preview deployment and catch regressions early.
Get started
Create your first actor in minutes.