ProductTests a product idea before you spend on it
Idea stress tester
Tell it what you are thinking about building and it restates the idea as a thesis, lists what has to be true, and goes looking for evidence for and against each belief, graded by how much it actually proves. It names the single belief most likely to change your decision, says how much more time and money the idea deserves right now, and designs the next test around that belief. It keeps an active thesis on file and updates it as interviews, test results and new competitors come in.
- Works with
Apify
DataForSEONotionGoogle Docs- Recommended model
- Claude Opus 5.5
- Skills
- 9
What it does
- Restates your idea as a thesis and lists the beliefs that have to be true for it to work
- Searches for evidence for and against each belief, including competitors, substitutes, past attempts and real prices, and grades how strong it is
- Names the one belief most likely to change your decision and says how much more time and money the idea deserves now
- Designs the cheapest test that settles that belief, with a pass line agreed before it runs
- Keeps an active thesis on file and updates it as interviews, test results and new facts arrive
- Reviews a framework or book you hand it and says whether it adds anything to the method
The skills it brings
Playbooks the mate follows when the job calls for them. You can read and edit every one after adding it.
/ist-stress-testist-stress-testUse when a founder shares a product or startup idea and needs to know what has to be true, what the evidence says, what could kill it and how much more effort it deserves now.
/ist-evidence-huntist-evidence-huntUse when outside evidence would change a named belief about an idea, such as a competitor, substitute, prior attempt, real price or a search for disconfirmation, and not just because an idea was shared.
/ist-experiment-designist-experiment-designUse when a bottleneck belief has been named for an idea and the person wants the cheapest, fastest test that would move it, with a pass line set before it runs.
/ist-thesis-updateist-thesis-updateUse when interview notes, test results, numbers or news arrive for an idea already on file, to re-grade its beliefs, update the bottleneck and the allocation call.
/ist-method-reviewist-method-reviewUse when the person hands over a framework, rubric, investment memo, book or set of principles for judging ideas and wants to know whether it should change how ideas get tested.
/research-source-checkSource checkJudging whether a source can carry a claim: primary or secondary, who published it and why, how old the data is, conflicts of interest, circular citations, triangulating with independent sources, and saying plainly when the evidence is thin.
/research-competitor-analysisCompetitor analysisMapping a business's competitors from public sources: choosing the competitor set, positioning and messaging, pricing pages, features, reviews, ads in public ad libraries, and a comparison table where every cell has a source and a date.
/research-customer-voiceCustomer voice researchMining what customers say in public (reviews, forums, communities, Q&A sites) about a product, a competitor or a problem: quotes with links, coded into pains, desired outcomes, objections and triggers, themes counted, and their exact language handed over for copy and product decisions.
/research-market-sizingMarket sizingEstimating how big a market is (TAM, SAM, SOM) honestly: bottom-up from counts of real customers and real prices first, top-down only as a cross-check, every input sourced or labelled as an assumption, and results given as ranges rather than false precision.
Things to ask it
I'm thinking about building …Stress test this idea: …What would kill this idea fastest? …Here are my notes from five customer interviews