Self-hostable replacements for Note-taking/ Knowledge management, ranked by adoption and filtered by what still ships code. 2 of 4 are actively maintained.
There are 4 open-source alternatives to Note-taking/ Knowledge management in this dataset, and 2 of them are actively maintained — the strongest is Joplin with 56k stars. Check the licence before commercial use: the licence, not the feature list, decides whether you can build a product on top.
| Project | Stars | Maintenance | Commits / 12mo | Licence |
|---|---|---|---|---|
| Joplin | 56k | Actively maintained | 2068 | MIT |
| SiYuan | 46k | Actively maintained | 6966 | AGPL-3.0 |
| Logseq | 0 | Not verified | 0 | Unknown |
| Notesnook | 0 | Not verified | 0 | Unknown |
Repository metadata last refreshed August 2026. Star counts never decay — read the maintenance column before the star column.
Alternative to Evernote, Onenote, Roam Research, Note-taking/ Knowledge management, Note-taking / Personal Knowledge Management
Note taking application with markdown editor and encryption support for mobile and desktop platforms. Runs client-side and syncs through a self hosted Nextcloud instance or similar (alternative to Eve
Alternative to Note-taking/ Knowledge management, Note-taking / Personal Knowledge Management
A privacy-first personal knowledge management software, written in typescript and golang.
Alternative to Roam Research, Note-taking/ Knowledge management, Note-taking / Personal Knowledge Management
Knowledge base manager
Alternative to Evernote, OneNote, Note-taking/ Knowledge management, Note-taking / Personal Knowledge Management
A fully open source & end-to-end encrypted note taking alternative to Evernote.
By adoption and maintenance, Joplin is the strongest option: 56k GitHub stars, 2068 commits in the last twelve months and actively maintained status. Note taking application with markdown editor and encryption support for mobile and desktop platforms. Runs client-side and syncs through a self hosted Nextcloud instance or similar (alternative to Eve "Best" still depends on your constraints — licence, hosting model and integrations matter more than star count once you are actually deploying.
Note-taking/ Knowledge management itself is commercial, but 2 maintained open-source projects cover overlapping functionality and can be self-hosted. Free to licence is not free to run: budget for hosting, upgrades, backups, security patching and the engineer time behind them.
It depends on the project's licence. Permissive licences (MIT, Apache, BSD) allow closed commercial products and managed hosting. Copyleft licences (GPL, AGPL) require derivative work to stay open, and AGPL extends that to network use. Source-available licences (BSL, SSPL, Commons Clause) usually forbid competing commercial services outright. Check the licence column on each project before planning a business model.
This dataset tracks 4 open-source implementations in the Note-taking & Editors category that overlap with Note-taking/ Knowledge management, of which 2 show real momentum. That gap between "exists" and "maintained" is the number that matters — an abandoned project is not a competitor and not a safe dependency.
Existence is not competition. A project competes with you only if it is maintained, findable, deployable by your buyer and licensed for their use. Most projects fail at least one of those tests. Run all four before you shelve an idea — or before you assume you have a clear run.
Stars are a lifetime counter with no decay, so a project abandoned in 2022 still looks like a leader in 2026. In this dataset 149 projects are dormant, abandoned or archived, and several of them sit in the top decile by stars. Sort by momentum and commit activity instead — popularity tells you the project was once interesting, maintenance tells you whether it will still be there when your customer needs a bug fixed.
When a prospect says 'we could just self-host the free one', they are usually comparing your price against zero. The real comparison is your price against hosting, upgrades, backups, security patching, integration work and the engineer hours behind all of it. Quantifying that number is the single most effective response to a free-alternative objection — and it is more persuasive coming with a spreadsheet than with a feature list.
Founders treat licensing as a legal footnote and then discover it dictates strategy. Permissive licences allow closed commercial forks, which is why so many managed services exist around MIT and Apache projects — and also why your differentiation cannot be the code itself. Copyleft licences, especially AGPL, remove the closed-wrapper option entirely, which reduces competition but restricts you too. Source-available licences exist precisely to stop the wrapper business.
The Note-taking & Editors category scores 49/100 on saturation. IdeaProof scores your idea against live competitors, market size and 1,000+ documented failures in about two minutes.
Search this database by category and by the commercial product you would replace. It covers 1665 projects across 130 categories, each mapped to the paid tool it substitutes. If your category shows a "Crowded" verdict, a maintained free version almost certainly exists and your positioning has to account for it.
No. It means free is your price anchor. Plenty of large companies were built next to a good open-source project — the ones that failed were the ones selling the same job at a price the free tool made indefensible. Find the part of the job the project deliberately does not do, and sell that.
Each category gets a 0–100 score built from three inputs: how many implementations exist, what share of them are still actively maintained, and how far ahead the leading project is compared with the category median. 62+ is Crowded, 38–61 Contested, under 38 Open. 11 categories are Crowded and 88 are Open.
A project has momentum when it committed code in most of the last twelve months, shipped a release recently and is not archived. 736 of 1665 projects qualify. This is the single most useful filter here — it strips out the popular-but-dead repositories that make a category look more competitive than it is.