An honest comparison — sources linked below

Two free validations.
Then the work still starts.

The short answer: IdeaProof gives 90 free credits on signup — two complete validations, no card — then sells one-time credit packs from €19.99, covering 50+ scoring criteria, TAM/SAM/SOM sizing, competitor SWOT and templated brand and ad assets. kitty.build gives one free nine-board validation with live web research and linked citations, a GO / PIVOT / NO-GO verdict, and then builds the site, writes code into your GitHub repo and runs the venture daily. Two free scores, or one free verdict and a builder behind it.

Feature-by-feature comparison of kitty.build and IdeaProof
AreaKittyIdeaProof
What $0 gets you100 Treats — one complete nine-board validation, no card.90 credits — two complete validations at 40 credits each, no card. The most generous free offer here.
How the analysis is produced9 boards search the live web in parallel and link every material claim.Scoring across 50+ criteria with confidence levels; lighter on click-through sourcing.
Market sizingMarket and economics boards size the opportunity with linked sources.Explicit TAM/SAM/SOM calculation — clearly presented and fast.
Subscription or one-timeSubscription from $17/mo, because the engine runs daily.One-time credit packs, no subscription — though credits expire after 12 months.
Currency and price clarityUSD, on-site, tied to what Stripe charges.EUR only — US buyers carry the FX spread.
Marketing assetsReal posts published to real channels on approval, measured by performance.Templated ad creatives for Meta, Google, LinkedIn, TikTok and Instagram.
Builds and runs the productSite on your domain, commits in your repo, daily operating cycles.Not offered.

Prices and claims about IdeaProof were checked against the sources below on 2026-08-30: IdeaProof — homepage and pricing · IdeaProof — best AI validation tools 2026. Pricing changes: the number on their own site wins over the number on ours. Product names are trademarks of their owners; these are independent comparisons.

What IdeaProof does well

  • The most generous free tier in validation — two complete validations, no card, no trial clock
  • One-time credit purchases rather than a subscription, so there is nothing to cancel
  • Goes past the verdict into brand and marketing assets, which most validators do not
  • Confidence levels on the score are an honest touch — it tells you how sure it is

Where IdeaProof falls short

  • Priced in EUR only, so US buyers eat an FX spread and a moving sticker price
  • Credits expire after 12 months, which quietly undercuts the one-time framing
  • Brand and ad assets are templated starting points, not campaigns
  • No site, no code, no operations — and no ongoing monitoring

When IdeaProof is the better buy

Two full validations for free with no card is the best free offer in this comparison, and if you have two ideas to compare that is exactly the tool to use this afternoon. One-time EUR credit packs also beat a subscription for anyone who validates twice a year and nothing else. kitty.build gives one free validation, not two.

Our verdict on IdeaProof in 2026

IdeaProof has the most generous free offer in the validation category: two complete validations, no card, no countdown. Paid packs are one-time in EUR rather than a subscription, which suits anyone allergic to recurring charges, though the 12-month credit expiry takes some of that back. It stops where every validator stops — the brand kit and ad creatives are templates, not a launched business. kitty.build's free verdict is one validation rather than two, but it is nine boards deep with live citations, and the product that follows actually builds and runs the venture.

IdeaProof pricing

  • Free credits — €0: 90 credits on signup = 2 full validations. No card.
  • Starter — €19.99: 150 credits: 1 validation plus market analysis.
  • Builder — €49.99: 700 credits: 2 validations, business plan, brand strategy.
  • Founder — €99.99: 1,500 credits: 5 validations, 2 business plans, full marketing suite. Credits are valid 12 months; prices are listed in EUR only.

Frequently asked

Is IdeaProof free?
Yes, meaningfully: 90 credits on signup with no credit card, and a full validation costs 40 credits — so you get two complete validations for nothing. Paid packs start at €19.99 for 150 credits.
Do IdeaProof credits expire?
Yes — credits are valid for 12 months from purchase. That is worth knowing before buying the €99.99 Founder pack for ideas you have not had yet.
How much does an IdeaProof validation cost?
40 credits. The €19.99 Starter pack of 150 credits covers one validation plus market analysis; the €49.99 Builder pack covers two validations plus a business plan and brand strategy.
Does IdeaProof build your product?
No. It produces validation scores, market sizing, brand strategy and templated marketing creatives. Building is a separate purchase — or use kitty.build, where the validation and the build are the same product.
Should I switch from IdeaProof to kitty.build?
Only if the gap you keep hitting is the one kitty.build closes. kitty.build is the only tool in this set that both refuses to build a bad idea and builds the good one. Nine boards research the live web, cite what they find and return a GO / PIVOT / NO-GO verdict for free; if the verdict is GO, the same product ships the site on your domain, writes the code into your GitHub repo and runs daily cycles where a task only counts as done with evidence attached. The trade is that it is a subscription and it is opinionated. If you want a single document, or you want to art-direct every pixel yourself, something else on this list fits you better. Where IdeaProof still wins: Two full validations for free with no card is the best free offer in this comparison, and if you have two ideas to compare that is exactly the tool to use this afternoon. One-time EUR credit packs also beat a subscription for anyone who validates twice a year and nothing else. kitty.build gives one free validation, not two. The first kitty.build verdict is free with no card, so you can find out without cancelling anything.

Keep comparing

Or start at the full comparison index.

Get the verdict free. Decide after.

Nine boards, live research, every claim cited, GO / PIVOT / NO-GO — for $0. If it says NO-GO you just saved months and never paid us. If it says GO, Kitty starts building. Watch real ventures doing it on our live feed.

Start free — no card

No revenue share, ever · Failed tasks are free · Your repo, your domain, your data