40 FREE STARTUP IDEAS from Greg Isenberg ($100 MRR-$1M MRR ideas)

1. build browser extension detecting duplicate GPT-4 queries. startups wasting $5k/month on repeated prompts. one plugin saves companies 30% on OpenAI costs.

2. directory of tech companies still paying for empty offices. brokers need sublease prospects. charge $500/month for verified matches.

3. AI turning support transcripts into API docs. engineers waste weeks writing documentation. charges $2k/month to auto-generate.

4. alert system for startup hiring pages >$10M raised. recruiters checking careers pages daily. makes $15k/month from layoff signals.

5. AI catching Stripe webhook failures and auto-fixing. companies losing $10k/month to failed payments. charge per recovery.

6. marketplace for crypto-friendly accountants. startups getting rejected by traditional firms. matchmaker makes $20k/month.

7. AI analyzing GitHub to predict trending dev tools. VCs paying $5k/month for early adoption signals.

8. Slack scanner finding sensitive data sharing. companies violating compliance. $1k/month per security audit.

9. AI turning raw sales calls into pitch snippets. sales teams recreating same demos. saves 10 hours per rep weekly.

10. database of startups outgrowing HubSpot. some companies overpaying for basic CRM. charge sellers for leads.

11. AI generating industry-specific privacy policies. lawyers charging $2k for templates. $100 per document.

12. marketplace for fractional dev advocates. startups can't afford full-time. platform makes $30k/month matching.

13. AI monitoring competitor pricing changes. product teams missing market shifts. $200/month for alerts.

14. Figma to React component converter. developers spending days on UI. charge per export.

15. AI analyzing VC rejections for feedback. founders missing improvement signals. charge per analysis.

16. tool finding unused SaaS credits. startups waste $50k/year on tools they could get free. charge 20% of savings.

17. AI generating custom investor updates. founders spending 5 hours monthly. one tool makes $10k/month automating.

18. marketplace for cancelled conference booths. last-minute spaces go empty. broker makes $25k/month reselling.

19. AI scanning terms of service for hidden fees. companies missing subscription traps. charge per scan.

20. directory of startups offering AI APIs. developers need GPT alternatives. monetize through affiliate.

21. tool turning spreadsheets into mobile apps. small businesses need custom apps. charge per publish.

22. AI monitoring Twitter for customer complaints. support teams missing mentions. $300/month per brand.

23. marketplace for startup-ready CFOs. companies need part-time finance. $40k/month in placement fees.

24. chrome extension saving LinkedIn to HubSpot. sales teams copying manually. charge per sync.

25. AI generating personalized cold emails. founders spending hours on outreach. $500/month per campaign.

26. tool finding underpriced micro-SaaS. investors manually tracking small companies. charge for deal flow.

27. AI detecting fake reviews on product sites. brands losing sales to competitors. $1k/month per scan.

28. marketplace for verified white-label agencies. founders waste weeks finding contractors. charge listing fees.

29. AI turning blog posts into Twitter threads. content teams duplicating work. $200/month per brand.

30. database of remote dev teams for hire. startups overpaying recruiters. charge teams listing fees.

31. tool monitoring AI hallucination rates. companies blindly trusting outputs. charge per check.

32. AI analyzing Zoom calls for sales insights. calls have gold but no one rewatches. $100/seat monthly.

33. marketplace for startup acquisition targets under $5M ARR. charge for deal access.

34. AI turning product screenshots into landing pages. marketers spending days designing. charge per page.

35. tool finding open source alternatives to SaaS. companies overpaying for basic features. affiliate revenue.

36. AI generating custom app store screenshots. developers using generic images. $50 per app update.

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