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 |
|---|---|---|---|---|---|---|---|
 AFFiNEA workspace with fully merged docs, whiteboards and databases. | ReviewsNone yetWrite one for AFFiNE | Lowest paid plan$6.75per monthPro, as of October 28, 2026 | Free planYes | Free trialNot confirmed | Public APINot confirmed | Runs onmacOS, Windows, Linux, iOS, Android, Web | Main features
|
 BookStackA simple, self-hosted, easy-to-use platform for organising and storing information | ReviewsNone yetWrite one for BookStack | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 CodaCoda is a collaborative all-in-one platform that brings teams and tools together. | ReviewsNone yetWrite one for Coda | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APINot confirmed | Runs onAndroid, iOS | Main features
|
 ConfluenceConfluence is your team workspace for creating and sharing knowledge. | ReviewsNone yetWrite one for Confluence | Lowest paid plan$5.78per user per month, as listed for 300 usersStandard, as of October 20, 2026 | Free planYes | Free trialYes | Public APIYes | Runs onWeb, iOS, Android | Main features
|
 GitBookThe docs platform that flags outdated content and keeps docs accurate for people and AI | ReviewsNone yetWrite one for GitBook | Lowest paid plan$65per site per month, billed annually, plus $12 per userEssential, as of October 19, 2026 | Free planYes | Free trial14 days | Public APIYes | Runs onWeb, GitHub, GitLab | Main features
|
| MintlifySelf-updating documentation for startups, enterprises, and agents. | ReviewsNone yetWrite one for Mintlify | Lowest paid plan$450per month billed annuallyPro, as of October 28, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onWeb | Main features
|
 NotionThe AI workspace to build custom agents, search across your apps, and automate busywork | ReviewsNone yetWrite one for Notion | Lowest paid plan$10per member per monthPlus, as of October 19, 2026 | Free planYes | Free trialYes | Public APIYes | Runs onmacOS, Windows, iOS, Android, Chrome extension | Main features
|
 NuclinoA simple, fast way to collaborate - bring knowledge, docs, and projects together in one place | ReviewsNone yetWrite one for Nuclino | Lowest paid planSee plans | Free planYes | Free trial14 days | Public APIYes | Runs onmacOS, Windows, Linux, iOS, Android | Main features
|
 OutlineYour team's knowledge base | ReviewsNone yetWrite one for Outline | Lowest paid planSee plans | Free planYes | Free trial30 days | Public APIYes | Runs onmacOS, Windows | Main features
|
| ReadMeHelping you create docs that make your APIs easy to use and maintain. | ReviewsNone yetWrite one for ReadMe | Lowest paid plan$250per month, billed annuallyPro, as of October 28, 2026 | Free planYes | Free trialYes | Public APIYes | Runs onWeb | Main features
|
 SlabEasily create, organize, and discover knowledge for your entire organization | ReviewsNone yetWrite one for Slab | Lowest paid plan$6.67per user per month, billed annuallyStartup, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onmacOS, Windows, Chrome extension | Main features
|
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