Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 ElicitAI for scientific research that helps you synthesize evidence, draft proposals and weigh tradeoffs | ReviewsNone yetWrite one for Elicit | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 ExaSearch API for AI agents, with real-time web data | ReviewsNone yetWrite one for Exa | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | |
 KomoAsk anything. Komo searches the web and answers with sources. | ReviewsNone yetWrite one for Komo | Lowest paid plan$17per month billed annuallyKomo Pro, as of October 28, 2026 | Free planYes | Free trialNot confirmed | Public APINot confirmed | Runs onNot confirmed | |
 LinerSearch with sources, research academic papers, and write clearly in one workflow | ReviewsNone yetWrite one for Liner | Lowest paid plan$14.99per month, billed annuallyPro, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 PerplexityAI-powered answer engine that provides accurate, trusted and real-time answers to any question | ReviewsNone yetWrite one for Perplexity | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onmacOS, Windows, iOS, Android | |
 Semantic ScholarA free, AI-powered research tool for scientific literature | ReviewsNone yetWrite one for Semantic Scholar | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | |
 UndermindYour AI co-researcher that finds the papers others miss | ReviewsNone yetWrite one for Undermind | Lowest paid plan$15per person per month, billed annuallyTeam, as of October 23, 2026 | Free planYes | Free trialNot confirmed | Public APIYes |
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a free plan. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed