Preuve AI vs Undermind
Plans, free access, limits and intended use side by side, taken from each vendor’s own pages. No score and no winner: the facts show where the two differ.
Change tools
Cited 0-100 viability score for a startup idea, with a free first check and one-time pricing
Deep literature search that reports its own coverage
- Free access
- Preuve AI: Free access
- Undermind: Free access
- Paid from
- Preuve AI: USD 59 one-time
- Undermind: USD 75 per month
- Plans listed
- Preuve AI: 7
- Undermind: 6
- Public API
- Preuve AI: Not confirmed
- Undermind: Not confirmed
Where Preuve AI and Undermind differ
- PlansPreuve AI lists 7 plans and Undermind lists 6.
Head to head
Each value from the tool’s profile and the vendor’s own pages
| Preuve AI | Fact | Undermind |
|---|---|---|
| Access and price | ||
| Free access availableReality Check | Free accessSame | Free access availableFree · USD 0 |
| USD 59 one-timeFounder Report | Lowest listed paid plan | USD 75 per monthPro (Industry) · or $60 per month billed annually |
| Free Reality Check (2 scans); Founder Report $59 one-time; Lifetime Pro $499 | Pricing model | Free plan; Pro from $16 a month billed annually |
| 7 | Plans listedDiffers | 6 |
| Not confirmed | Public API | Not confirmed |
| Not confirmed | Card to start | Not confirmed |
| Not confirmed | Open source | Not confirmed |
| What it is for | ||
| Checking whether a startup idea has demand and room before building it | Built for | Finding hard-to-locate papers on a specific research question |
| Research & sources | CategorySame | Research & sources |
| Platforms |
|
| Works with |
|
| How current | ||
| Profile sources checked | ||
| Prices confirmed · Oct 21, 2026 | Pricing checkSame | Prices confirmed · Oct 11, 2026 |
Official source check for both tools. No hands-on testing and no score: “Differs” marks a documented difference, not a better tool.
Plans and prices
Preuve AI
Prices confirmed · Oct 21, 2026- Reality CheckFree
- Founder ReportUSD 59 one-time
- 2-Report PackUSD 89 one-time
- 5-Report PackUSD 199 one-time
- Investor-Ready PackageUSD 499 one-time
Show 2 more plans
- Lifetime ProUSD 499 one-time
- Lifetime BusinessUSD 999 one-time
Undermind
Prices confirmed · Oct 11, 2026- FreeUSD 0
- Pro (Academic)USD 20 per monthor $16 per month billed annually
- Pro (Industry)USD 75 per monthor $60 per month billed annually
- Team (Academic)USD 18.70 per person per monthor $15 per person per month billed annually
- Team (Industry)USD 75 per person per monthor $60 per person per month billed annually
Show 1 more plan
- EnterpriseCustom
Strengths and limits
Preuve AI
Strengths
- One-time pricing: Founder products are single payments with no subscription, and Sentinel does not renew or charge after three months.
- Claims link to sources: The vendor says sourced claims link back to their source and estimates are labelled as estimates.
- Free first check: The Reality Check gives a score, market size and two competitor previews for 2 scans with no payment.
Limits to plan around
- Score method is closed: Factor weights, thresholds and agent prompts are unpublished, and the vendor says the score is a snapshot, not a guarantee.
- Narrow free tier: The free check is limited to 2 scans, each viewable for 7 days, with 2 competitor previews and no pivots.
- Narrow refund: The 14-day guarantee is a rerun first, once per customer, and not after Build with AI or an export; Lifetime plans and the Investor Package are excluded.
Undermind
Strengths
- Free plan with agent access: The pricing section lists agent connections and shared workspaces at $0, with abstracts and metadata searched.
- Coverage is reported: The provider says the report summary states when a search has probably not found everything, so you can extend it.
- Full-text search on Pro: The FAQ says Pro adds search of the full texts of nearly all open-access and preprint papers.
Limits to plan around
- Unnumbered limits: Free has standard rate limits and Pro 10x higher limits, but no page gives the base numbers.
- Single source database: Search draws on Semantic Scholar; the FAQ says a specific paper may not be in it.
- No refunds: The refund policy calls charges non-refundable once a billing period has begun, except where required by law.
See both products
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Questions about comparing tools
How does the comparison work?
Add two tools to the comparison tray from any tool card, then open this page. The table pulls each tool's verified plan details, platforms, strengths and limits from its profile, so both columns carry the same kind of evidence, with a separate source-check date for each tool.
Do you declare a winner?
No. The table sets two tools against each other on documented facts, not on a score. Which one wins depends on your task, your budget and your usage volume — three things we cannot see from here.
Why are some cells empty or marked unverified?
Because we could not confirm that detail on the vendor's own pages. Rather than filling the gap with a figure from elsewhere, we mark it and say why on the tool's profile.
Can I compare more than two tools?
Not at once. Two columns keep the differences readable and force a real decision. Remove either selected tool to replace it, or clear both to start a new pair.
Every figure in the table above comes from the linked profile, where the source and the verification date are listed. Browse all tools or read the editorial policy.