User-centred design
You can build anything.Ship what users need.
Intelligent AI agents act as users that browse your live product, prototypes or Figma designs, get stuck where your customers would, and report back with insights and recommendations backed by evidence.
Understand your users, before and after you ship
Stunt Double stands in for your users at every stage, turning questions about your product into answers you can act on today.
- 1Problem
The change looks fine
You ship a change to checkout on Friday afternoon. Every test passes, because no test covers the address form.
- 2Impact
Your customers find it first
The form stops accepting apartment numbers. You hear about it on Monday, from support tickets and a weekend of orders that never completed.
- 3Solution
Someone walks it on every deploy
Stunt Double runs checkout as the customers you are trying to win, and stops where they would stop.
- 4Benefit
You hear about it in minutes
The screenshot, the step and the reason land minutes after the merge, while the change is still the thing you are looking at.
Know before you build
Put an idea, a flow or a headline in front of lifelike users and hear their honest reaction in minutes, long before you commit engineering time to it.
Catch problems before your users do
Every change is checked against your requirements automatically, with the screenshot and the plain-language reasoning behind each pass and fail.
Ship changes that move the metric
Optimise toward the outcome you actually care about, then see exactly what moved it, so you iterate on evidence instead of opinion.
See your product through their eyes
A cast of users browses from the regions, devices and locales you serve, surfacing the friction you would never hit on your own setup.
A stand-in for your users at every stage
From early interviews to automated checks to behavioural optimisation, Stunt Double gives you user-grounded feedback at every stage of the process.
Ask your Runner
Runner is your co-pilot on every page. Ask in plain language and it casts actors, builds checklists, runs automations and finds answers, then takes you straight to the result.
Just ask, and it’s done
Runner knows every corner of the app and does the work for you, not just answers the question.
Skip the busywork
No forms or menus. Say what you want and Runner works out the steps.
Gets it done for you
Creates actors, checklists, interviews and automations, not just answers about them.
Understands your context
Sees the page you’re on, so "debug this run" or "fix this check" just works.
Always a keystroke away
⌘I opens Runner from anywhere, ready for whatever’s next.
Plugs into your agent stack
Ask from Slack, drive a run from Claude, and land the findings in Linear as issues your team can pick up.
Legal reviewer
Claims & terms
Compliance auditor
Policy & regulation
Onboarding expert
First-run journeys
Power-user expert
Advanced flows
Clarity reviewer
Non-technical lens
Meet your cast
AI that can act: we call them Aictors. Each is an expert in a specific role, from internal stakeholders to technical end-users, that steps in exactly when its perspective is useful.