Idea validation tools, compared
Five tools, including ours, with the prices and methods taken from their own pages. We put ourselves where we belong rather than at the top of the list.
Short answer
Which idea validation tool should I use?
It depends on how much you have already decided. Screening several ideas: a free instant scanner. Needing a document for someone else: a citation-heavy report. About to spend months on one idea: something that interrogates your reasoning before it answers.
The five, one line each
- ValidatorAI: free, under 60 seconds, scoring method not published
- IdeaProof: €19.99-99.99 one-time, three frontier models over 50+ sources
- Preuve AI: $29 report, ten parallel agents over live sources with a cross-validator
- DimeADozen: $9-129, 1,200+ URL citations, cohort maths from public filings
- GoNoGo: free tier then $9.99-19.99, a 15-minute interview and a verdict on fixed thresholds
Side by side
| Tool | Price | Time | Best when |
|---|---|---|---|
| ValidatorAI | Free | Under 60 seconds | You have several ideas and want to know which one or two deserve a second look. Paying anything per idea at that stage is bad economics, and a 60-second answer is exactly the right tool. |
| IdeaProof | €19.99-99.99 one-time | About 2 minutes | You want a market-sized document quickly and you already know how to describe your idea precisely. |
| Preuve AI | $29 report, free 60-second scan | From 60 seconds to several minutes | You want a cited document for a specific decision and you value source-checking above input depth. On the citation axis they are the closest thing to what we would use ourselves. |
| DimeADozen | $9 starter, $129 full | Minutes | You need a document that survives being forwarded: a co-founder, an investor, a spouse who wants to know why you are quitting your job. Compare on citation count and they win it. |
| GoNoGo (us) | Free tier, $9.99-19.99 per project | 15 minutes of talking | You have picked one idea and are about to spend real months on it, so the depth of the input decides the value of the answer. |
Prices and methods read off each vendor's own page on 16 August 2026. This category changes prices often; check before you buy.
What each one actually does
Price and speed are the easy axes and they hide the interesting differences. Below is the same five products by what happens between your idea and the answer. Every cell was read off the vendor's own product page on 18 August 2026, and where a page says nothing, the cell says so rather than guessing.
How your idea gets in
The single biggest divergence, and the one nothing else on the page can compensate for.
- ValidatorAI
- Written fields: idea, customer, problem
- IdeaProof
- "One sentence or a URL. We extract the rest."
- Preuve AI
- "Describe your startup idea in a sentence or two"
- DimeADozen
- Written description, optional file upload
- GoNoGo
- A 15-minute spoken interview with a video avatar that asks follow-ups
How much of your reasoning reaches the research
- ValidatorAI
- What fits in the fields
- IdeaProof
- One sentence, expanded by the model
- Preuve AI
- One or two sentences
- DimeADozen
- A description plus any files you attach
- GoNoGo
- 13 fields of 14 filled from the conversation: median 1,616 characters of your own words against 163 from a single idea field, measured across 26 projects
What else you can bring
Most founders already have something written down: a survey, a spreadsheet of signups, a competitor teardown.
- ValidatorAI
- Not mentioned
- IdeaProof
- A URL, which it reads for you
- Preuve AI
- Not mentioned
- DimeADozen
- "Add files that describe your business idea"
- GoNoGo
- Drop files into the session while you talk: text, CSV, spreadsheets, PDFs, images. Each upload is then graded before it is used, with its category, a reliability tier, the limitations of that kind of evidence and the sample size it represents, so a survey of nine friends is not treated as market data
Synthetic audience
- ValidatorAI
- "Customer Feedback Simulator": simulates reactions and objections; method not detailed
- IdeaProof
- Not mentioned
- Preuve AI
- Not mentioned
- DimeADozen
- Not mentioned
- GoNoGo
- A panel built from real posts across 11 platforms, calibrated by holding back part of the data and checking the personas against it
What checks the output
- ValidatorAI
- Scoring method not published
- IdeaProof
- Four models via OpenRouter (Claude, ChatGPT, Gemini, Grok) generate the analysis; "independent QA shows ~89% alignment with founder-verified outcomes"
- Preuve AI
- 10 agents over 60+ live sources with a cross-validator on top
- DimeADozen
- Citation volume: "verifiable, not LLM-hallucinated"
- GoNoGo
- Key claims re-checked by three independent models from three vendors (Anthropic, Mistral, Amazon); disagreement is recorded by name rather than averaged away
How the verdict is formed
- ValidatorAI
- Score, method unpublished
- IdeaProof
- Model-written assessment
- Preuve AI
- Score, published as deliberately harsh: 17.5% of ideas reach 70+ across 7,000+ analysed
- DimeADozen
- Tested against what comparable companies have proven
- GoNoGo
- Computed: five researched dimensions scored against fixed thresholds, verdict is a threshold on the sum (70+ go, 50+ pivot)
What you get afterwards
- ValidatorAI
- Six free tools including pivot assistant and founder readiness
- IdeaProof
- Nine deliverables including business plan, brand strategy, logo, marketing suite, pitch deck and landing page, all exporting to PDF
- Preuve AI
- Founder Report: verdict, founder fit, risk scoring, first-100-customers plan, 15-competitor map, three pivots, business plan. Monitoring from $19/mo
- DimeADozen
- A 150+ page report with 1,200+ URL citations across 100+ named sources
- GoNoGo
- 21 documents from three agents. Alex: 15, including the validation report, market intelligence, problem dossier, investor pitch deck guide, pitch one-pager, go-to-market playbook, customer economics and the focus-group interviews. Sam: what to build, on what, in what order, and what it costs. Maya: brand book, design system, logo, MVP builder prompt, and a landing page you can publish to start collecting leads
After the verdict
A validation is a moment. Markets keep moving after it.
- ValidatorAI
- Not mentioned
- IdeaProof
- Not mentioned
- Preuve AI
- Radar monitoring from $19/mo
- DimeADozen
- Not mentioned
- GoNoGo
- A daily digest built for your project specifically: news in your niche, your named competitors, and it is aimed at your still-unproven assumptions and the concerns your focus group raised, rather than at the market in general
Contact with real humans
The line every tool in this category stops at, including ours.
- ValidatorAI
- None
- IdeaProof
- None
- Preuve AI
- None
- DimeADozen
- None
- GoNoGo
- Reality Check: a real survey of the real people your landing page collected, scored against what the synthetic panel predicted
The axis nobody else has: a conversation
Four of the five products on this page start from something you typed. Ours starts from something you said: a spoken interview with a video avatar that asks its next question based on your last answer, in any of 21 languages, for about a quarter of an hour.
It runs full duplex. You can cut in mid-sentence and it stops and listens instead of talking over you, and a pause for thought does not end the turn. That is the difference between an interview and a form read aloud, and it is why a quarter of an hour of it is bearable at all.
What that buys. In a randomised experiment on 1,001 people, spoken answers ran 2.5 times longer than typed answers to the same question (Höhne, 2024, Social Science Computer Review 42(4)). In our own data the interview fills 13 of 14 context fields, a median of 1,616 characters of the founder's own words against 163 from a single idea box, and 13 of 34 projects were carried through all four phases.
What we are not claiming: that speaking makes people more honest, or that a photorealistic avatar makes them more open. Both propositions have been tested and both went the other way. The case for voice is the volume of context it collects, not candour, and a comparison page that overstated this would deserve to be ignored.
Where we lose
A comparison written by one of the five is worth nothing unless this section exists. Here is ours, in the order it would cost you.
To ValidatorAI and Preuve
Speed, and it is not close. They answer in under a minute for free. We ask for half an hour before we say anything at all, and for someone screening a dozen ideas that is the wrong trade in every direction.
To everyone, on access
We need a microphone and thirty quiet minutes. On a commute, in an open-plan office, or with a sleeping child in the room, every other tool on this page works and ours does not. That is a real cost of the thing that makes us different, not a detail.
To DimeADozen
A published citation count. Their report states 1,200+ URL citations across 100+ named sources. Ours links sources and re-checks key claims across three models, but we publish no count, and if you are comparing on that number they win it. Whether a bigger number means a better document is a separate argument, and we would rather have the argument than pretend the number is not there.
What none of them do
None of us talk to your actual customers. Synthetic personas, however carefully built, are a rehearsal. We calibrate ours by building personas from part of a real dataset and checking their predictions against the part we held back, which is a reason to trust the rehearsal and not a reason to skip the performance. The current agreement figure is being re-measured on our current model and we would rather publish it late than publish a stale one.
None of us can tell you whether you will stick with it. The most common reason a validated idea dies is that the founder lost interest in month four. No tool on this page scores that.