TL;DR
IdeaKiller is a good cheap filter. It promises a fast 0-100 verdict, TAM/SAM/SOM, competitor insights, revenue projections, and unit economics in about 120 seconds. Preuve AI (formerly Test Your Idea) is slower and more expensive, but it is built for a different job: sourced market validation. If you want a quick kill/no-kill signal, IdeaKiller makes sense. If you want evidence you can defend to a co-founder, investor, or yourself, use Preuve AI.
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Preuve AI runs 10 agents against live market data and links every claim to a source. Free analysis in 60 seconds.
IdeaKiller Has the Right Instinct
I like the name. It tells you exactly what the tool is trying to do.
Most founders don't need more encouragement. They need a faster way to kill weak ideas before those ideas eat six months of their life.
On its public site, IdeaKiller promises a 0-100 verdict, real-time web search data, business model analysis, competitor insights, TAM/SAM/SOM, revenue projections, unit economics, and even a devil's-advocate section. Pricing starts at $14, with one free validation per month.
That's not fluff. That's a real value proposition.
The sharper question is this: do you want a verdict, or do you want the evidence behind the verdict?
Quick Comparison: Preuve AI vs IdeaKiller
| Feature | IdeaKiller | Preuve AI |
|---|---|---|
| Primary job | Fast GO/NO-GO style screening | Decision-grade validation with sourced evidence |
| Speed | About 120 seconds | Free scan in about 60 seconds, deeper paid report after that |
| Proof style | Verdict + business analysis | Linked market evidence + analysis |
| Competitor intel | Competitor insights | Real names, pricing, weaknesses, gaps |
| Community pain signals | Not the core public promise | Reddit, Indie Hackers, Hacker News, Quora |
| TAM/SAM/SOM | Yes | Yes, with source links |
| Unit economics | Yes | Included in deeper analysis and financial sections |
| What happens next | Kill it or keep going | Fix blockers, reposition, or iterate |
| Cheapest paid option | $14 | $29 |
What Does IdeaKiller Get Right?
Most AI validation tools fail because they're vague - business-school tutors with lots of frameworks, polite language, and no pressure.
IdeaKiller is better than that. The product seems designed to force a founder into a harder question: should this idea live or die? It earns the name.
- ✓Cheap enough to use casually. Fourteen dollars is an impulse-buy price for a founder.
- ✓Fast enough to use repeatedly. The promise is about two minutes, not a long wait.
- ✓Broader than just a score. The public feature set includes economics, market sizing, and competitor analysis.
- ✓Clear psychological value. Founders need permission to kill bad ideas. The brand is built around that.
If you are screening a backlog of startup ideas and want the fastest possible first pass, IdeaKiller is a legitimate option.
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Where Does Preuve AI Go Deeper?
1. Evidence First, Not Verdict First
IdeaKiller's center of gravity is the answer - score the idea, stress-test the business model, make the call.
I built Preuve AI around the evidence behind the answer. When the report says a competitor raised money, it links the source. When it says search demand is growing, it links the trend. When it says founders are complaining about the workflow, it shows the thread. 10 specialized AI agents pull from 50+ live sources and cross-validate across multiple models.
The difference sounds subtle until someone asks, "Why do you believe this?" A score is an opinion. A score with receipts is research.
2. Community Signals, Not Just Spreadsheet Logic
A lot of validation tools are strong on analytical structure and thin on lived reality. They can size a market and sketch a revenue model. That's useful as far as it goes, but it stops short of the messy part.
Startup ideas usually fail because the pain isn't sharp enough, the niche is wrong, or the founder misunderstood what people actually hate about the current options. That signal often lives in messy places: Reddit comments, Hacker News threads, Indie Hackers posts, review sites, and user complaints.
I built Preuve AI to be stronger there. It pulls those qualitative demand signals into the report instead of stopping at "market attractive" or "competition moderate." Over 5,000 startup ideas have been scored by Preuve so far.
3. Better When the Right Answer Is "Fix It"
Sometimes the correct answer is kill it. IdeaKiller is built for that moment.
But a lot of ideas are not dead - they're just badly framed. Wrong audience, wrong wedge, wrong first use case.
Preuve AI is better when the answer is "not this version." The report shows what dragged the score down, how competitors are positioned, what gap still exists, and what to change next. Paid reports also give you pivot iterations so you can rework the idea instead of starting from zero every time.
Who Should Use IdeaKiller
- •You have 5-10 rough ideas and need a cheap first-pass filter.
- •You care more about speed than deep sourcing.
- •You want a clear kill/no-kill decision with economics attached.
- •You are early enough that a lightweight verdict is enough to move on.
Who Should Use Preuve AI
- •You need to show your co-founder or investor where the numbers came from.
- •You want real competitor pricing, funding context, and positioning gaps.
- •You care about community pain signals, not just business-model math.
- •You want to improve the idea, not just score it once.
The Bottom Line
IdeaKiller is not the kind of competitor I'd dismiss. It has a sharper promise than most validation tools, and the pricing is aggressive enough to make it easy to try.
But it is solving a different problem.
If your question is "Should I even keep thinking about this idea?", IdeaKiller is a smart first pass.
If your question is "What does the market actually say, and can I prove it?", Preuve AI is the better tool.
IdeaKiller helps you kill ideas faster. Preuve AI helps you trust the decision.
See other comparisons: vs VenturusAI, vs ValidateIdea, vs DimeADozen, vs ChatGPT, plus the best validation tools 2026 roundup and the broader startup validator alternatives guide.
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FAQ
Is IdeaKiller cheaper than Preuve AI?
Yes. As of March 5, 2026, IdeaKiller's public pricing starts at $14 for one validation and includes one free validation per month on the free plan. Preuve AI's paid report is $29, with a free scan before you buy. If price is your main filter, IdeaKiller wins.
Does IdeaKiller use real-time data?
IdeaKiller's public site says it uses real-time web search data and shows the reasoning behind its score. That's a stronger claim than most generic AI validators. The difference is positioning: IdeaKiller leads with the verdict and business analysis, while Preuve AI leads with linked market evidence you can click through and verify.
What's the main difference between IdeaKiller and Preuve AI?
IdeaKiller is optimized for fast screening. You get a GO/NO-GO style score, TAM/SAM/SOM, competitor insights, revenue projections, and unit economics in about 120 seconds. Preuve AI is optimized for decision-grade research: live competitor data, community pain signals, trend data, and a fix playbook with source links.
Which tool is better for investors or co-founders?
If you need to defend your numbers in front of someone else, Preuve AI is the safer choice. Investors and skeptical co-founders don't just ask for conclusions. They ask where the conclusion came from. Preuve AI is built around that evidence layer.
Can I use both tools together?
Yes. That's actually a sensible workflow. Use IdeaKiller as a cheap first-pass filter when you're screening a lot of ideas. Then run the survivors through Preuve AI when you need sourced competitor data, community signals, and a report you can defend.
Is Preuve AI biased in this comparison?
Obviously. I built Preuve AI. I also think IdeaKiller gets something important right: bad ideas should die fast. I tried to keep this fair. If you want a quick and cheap kill/no-kill signal, IdeaKiller is a real option. If you want evidence you can verify before spending months building, I think Preuve AI is stronger.
Vincent
5 years in B2B growth, building Preuve AI in public. 82% of ideas it scores aren't ready, the point is finding out in 5 minutes, not 3 months.
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