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Stunt Double vs Synthetic Users

Synthetic Users generates AI participants from an audience you define, which you can ground in your own files, and runs interviews, surveys, concept studies and website tests with them, then summarizes what they said. It is built for research teams that want many interviews, fast.

Side by side

Every fact about Synthetic Users links to the public page it came from, checked on October 31, 2026. Pricing and features change, so check their site before you decide.

What it tests

Synthetic Users
Interviews, surveys and studies that validate concepts, with AI-generated summaries and reports.Source, October 31, 2026 (opens in new tab)
Stunt Double
Checklist runs (pass or fail per requirement, with a screenshot and the reasoning), interviews with actors, design reviews against your guidelines, and triaged feedback.

Real browser on live sites and preview deployments

Synthetic Users
Yes for user-testing studies: participants operate the real product in a live browser, working toward a task. Preview deployments are not described.Source, October 31, 2026 (opens in new tab)
Stunt Double
Yes. An actor drives a real browser on any URL, including a preview deployment. Public URLs work on every plan; Startup and up add private URLs, signed-in credentials and an email inbox.

Figma prototypes

Synthetic Users
Not confirmed from their public pages
Stunt Double
Yes. Actors go through Figma prototypes, and design reviews run on Figma frames, from the app or the Figma plugin.

Who does the testing

Synthetic Users
AI participants generated from an audience you define, optionally grounded in files you attach, such as documents, images and research briefs.Source, October 31, 2026 (opens in new tab)
Stunt Double
Actors: AI users you cast with a role and a goal. They use the product and report what they did, step by step. Behavior, not opinions.

MCP server

Synthetic Users
Not confirmed from their public pages
Stunt Double
Yes, a hosted MCP server on every plan, Free included. It creates and runs checklists and interviews, and reads the results.

Pull request comments

Synthetic Users
Not confirmed from their public pages
Stunt Double
Yes. With GitHub connected, a checklist runs on a pull request’s preview deployment and posts its results on the pull request, and workflows can start on GitHub events.

Pricing model and entry price

Synthetic Users
Annual plans paid in Research Tokens, from $12,500 a year, with unlimited seats.Source, October 31, 2026 (opens in new tab)
Stunt Double
Free plan for one person: two actors and 60 minutes of runs a month, no card. Solo Trial $9/mo for one person, up to three months; Hobby $79/mo for a team of three.

Choose Synthetic Users when

  • You want many interviews across audience segments, early, before anything is built.
  • You test concepts and early ideas rather than a working product.
  • You want interview transcripts and summaries grounded in your own customer data.

Choose Stunt Double when

  • You want to watch the product being used, step by step, rather than read what a participant says it would do.
  • You want requirements checked pass or fail, with a screenshot of each, and checked again after every change.
  • You want to start on a Free plan, with no annual contract.

Sources

Public pages from Synthetic Users, read on October 31, 2026. If something here is out of date, tell us and we will correct it.

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The Free plan is one person, two actors and 60 minutes of runs a month, with no card. Point an actor at a URL and read what it did.

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