Idea checked
an open source alternative to Notion
There is already a crowded open-source Notion-alternative market, with AppFlowy clearly leading and several smaller contenders covering different slices of the problem.
Confidence: high — The signals include multiple active repositories, HN discussions, and review pages; enough to judge competition and likely positioning, but not enough to size revenue precisely.
- hackernews 30
- github 20
- tavily 7
Who is already building this From data
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AppFlowy is the clearest leader in the space: 74,715 stars, 5,759 forks, and recent activity; it explicitly calls itself the leading open-source Notion alternative.
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Docmost is a serious competitor in the wiki/documentation segment, with 21,195 stars and 1,479 forks; it positions itself as an open-source alternative to Confluence and Notion.
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Focalboard also targets the same category, with 26,356 stars and 2,571 forks, but frames itself as an alternative to Trello, Notion, and Asana.
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AFFiNE appears to be another major name in the category from third-party coverage, with a strong focus on local-first storage and privacy.
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Smaller projects are still entering the field, including Alexandrie (2,266 stars) and Colanode (4,996 stars), both explicitly described as open-source Notion alternatives.
What people actually say From data
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HN interest is real but uneven: AppFlowy threads range from 304 points / 78 comments to only 3 points / 1 comment, suggesting early burst attention but not sustained mainstream discussion.
- hackernews Appflowy – open-source Notion Alternative 2021-11-16
- hackernews AppFlowy: an open-source alternative to Notion 2021-11-29
- hackernews AppFlowy – open-source alternative to Notion 2024-08-30
- hackernews AppFlowy: An open-source alternative to Notion 2022-06-17
- hackernews AppFlowy – open-source alternative to Notion 2023-10-18
- hackernews AppFlowy is an open source alternative to Notion 2021-11-17
- hackernews AppFlowy: An Open-Source Alternative to Notion 2022-07-28
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People repeatedly value offline-first or local-first behavior; one HN request specifically asked for a Notion-like tool that works offline and keeps Notion-style database views.
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Privacy and self-hosting come up again and again in the repo blurbs and discussion snippets: AppFlowy, Docmost, Focalboard, Colanode, and Alexandrie all emphasize user control of data.
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A recurring complaint in third-party commentary is that Notion is strong on databases, while open-source alternatives often feel simpler or less complete.
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Some discussion threads explicitly mention Outline and Trilium as alternatives, which shows users are comparing against a wider set of tools, not just AppFlowy.
Where the opening is Model estimate
The model's read of the signals below — not something anyone measured.
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The market is crowded, so a new product would need a sharper wedge than 'open-source Notion alternative'; that label is already taken by several better-known projects.
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There is likely room in the offline-first + database-views combo, because that exact need shows up in HN and is not clearly solved by the top projects in the signals.
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The strongest differentiation themes visible here are local-first storage, self-hosting, and AI; without one of those, a new entrant will look generic.
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Smaller projects with tiny star counts suggest the long tail is easy to start but hard to win with, which is a warning sign for undifferentiated clones.
How big the market might be Model estimate
The model's read of the signals below — not something anyone measured.
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The category has pulled substantial open-source attention: AppFlowy has 74,715 stars, Focalboard 26,356, Docmost 21,195, APITable 15,435, and Colanode 4,996.
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HN threads about open-source Notion alternatives have reached meaningful engagement, including 1,952 points and 454 comments for a Docs/Notion discussion.
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Multiple separate HN posts over several years indicate ongoing demand rather than a one-off spike.
- hackernews Appflowy – open-source Notion Alternative 2021-11-16
- hackernews AppFlowy: an open-source alternative to Notion 2021-11-29
- hackernews Open Source Alternative to Notion 2021-11-19
- hackernews Appflowy.io – open-source Alternative To Notion 2023-10-10
- hackernews AppFlowy – open-source alternative to Notion 2024-08-30
- hackernews AppFlowy: An open-source alternative to Notion 2022-06-17
- hackernews AppFlowy – open-source alternative to Notion 2023-10-18
- hackernews Open source Notion altern. AppFlowy gets big-name backers and lands on the cloud 2023-11-21
- hackernews Open-source Notion alternative: Affine 2025-03-27
- hackernews Open-Source Notion Alternative 2024-07-23
- hackernews AFFiNE: Open-Source Notion Alternative with Focus on Privacy 2024-12-02
- hackernews AppFlowy is an open source alternative to Notion 2021-11-17
- hackernews Notion for everyone 2020-05-19
- hackernews Notion encourages busy-work 2020-05-03
- hackernews Show HN: Anytype – local-first, P2P knowledge management 2023-12-29
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The repo metrics suggest this is already a large open-source category, but the signals do not show direct paid conversion, enterprise adoption numbers, or revenue totals.
What could go wrong Model estimate
The model's read of the signals below — not something anyone measured.
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Direct competition is intense: the top repos already occupy the exact 'open-source Notion alternative' wording and have large install mindshare.
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Feature parity is hard; several comments and reviews suggest current alternatives are simpler than Notion, especially around databases and flexibility.
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Some projects are spreading into adjacent categories like wiki, docs, Trello, Asana, Slack, Miro, or Airtable alternatives, which may fragment the market further.
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A founder could burn time building yet another generalist workspace without a real edge, because many repos already promise self-hosting, local-first, collaboration, and AI.
- github AppFlowy-IO/AppFlowy 2021-06-16
- tavily Forget Notion: These open-source alternatives are way better
- github colanode/colanode 2024-07-29
- github Smaug6739/Alexandrie 2022-08-21
- github AppFlowy-IO/AppFlowy-Cloud 2021-06-16
- github Akaal-Creatives/LibreDiary 2026-02-09
- github busabase/busabase 2026-06-23
- github larrymargerum01/Workspace-Hub 2026-07-16
What to do this week Model estimate
The model's read of the signals below — not something anyone measured.
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Do not launch as a generic clone. Pick one wedge, likely offline-first personal use or self-hosted team docs with database views, because those needs are explicitly visible in the signals.
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If you build, compete on one concrete promise such as 'Notion-like pages and database views in local SQLite files' rather than broad workspace parity.
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Study AppFlowy, Docmost, Focalboard, Colanode, and Alexandrie first; they define the current baseline and show which positioning already resonates.
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If you want a better shot, target users who care about data control and self-hosting more than polished collaboration, because that is the clearest repeated demand signal here.
- github AppFlowy-IO/AppFlowy 2021-06-16
- github mattermost-community/focalboard 2020-10-06
- github docmost/docmost 2023-08-03
- tavily Forget Notion: These open-source alternatives are way better
- github colanode/colanode 2024-07-29
- github Smaug6739/Alexandrie 2022-08-21
- hackernews Notion encourages busy-work 2020-05-03
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Before writing code, validate whether people will switch for a narrow improvement like offline reliability, Markdown-first editing, or simpler self-hosted deployment.