Comet
Comet: A focused offline Markdown notebook for users who value local storage over AI features. Ranked #42 of 42 in AI Note-Taking Apps by our editors (4.8/10); pricing: Free plan; best for open-source offline Markdown note users.
At a glance
- Editor score4.8 / 10
- PricingFree plan
- Best forOpen-source offline Markdown note users
- Free planYes
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- Local SQLite storage keeps notes on the user's device
- Markdown, notebooks, tags, search, and archiving support organized notes
- Encrypted synchronization works with Nostr and Blossom without sign-up
Where it doesn't
- Desktop support is limited to macOS and Linux
- AI features such as summaries, AI search, and transcription are not verified
- Mobile support is listed as a future roadmap item
Our verdict on Comet
Comet is a local-first Markdown note-taking application for people who want their notes stored on their own device. It uses local SQLite storage and supports Markdown editing, portable content, notebooks, tags, full-text search, and note archiving. Offline access is supported, and the open-source desktop application runs on macOS and Linux. Comet is aimed at users who prioritize ownership, portability, and a simple file-and-database-based approach over a broad cloud workspace.
Its strongest differentiator is the combination of local storage and encrypted synchronization. Comet can synchronize encrypted data through Nostr and Blossom, with Nostr publishing and synchronization described as part of its connectivity roadmap and Blossom providing encrypted blob storage. No account or sign-up is required. This makes the product a natural fit for users who want local notes with an alternative synchronization path, although its ecosystem fit depends on whether Nostr or Blossom matches their workflow. Buyers seeking mobile access should also note that mobile support is a future roadmap item rather than part of the listed desktop coverage.
Comet’s published feature set centers on note organization, search, Markdown, offline access, and privacy-oriented storage rather than AI assistance. AI capabilities such as summaries, AI search, and transcription are not verified, so it should not be the first choice for buyers specifically seeking automated meeting notes or generative note workflows. Choose Comet for open-source, local-first Markdown notes on macOS or Linux; choose an alternative if AI functions, mobile apps, or a broader platform ecosystem are central requirements.
Your product? Our editors can test Comet in depth and publish a review, labelled as paid · from $149/mo →
Comet pricing
Comet fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| AI summaries | Not verified |
| AI note search | Not verified |
| Audio transcription | Not verified |
| Web clipper | Not verified |
| Offline access | Yes |
| Supported platforms | macOS, Linux |
| Deployment | Desktop |
| Platforms | macOS, Linux |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 2 integrations: Nostr, Blossom |
| Pricing | Free plan |
| Website | comet.md |
| Facts checked | 20 Sep 2026 |
Comet integrations
Comet lists 2 integrations on its own site.
- Nostr
- Blossom
Alternatives to Comet
- Gemini NotebookA Google-centric research assistant with citations, study tools, and rich generated outputs.9.3
- EvernoteA mature workspace for organized notes, tasks, calendars, and AI meeting capture.9.1
- Microsoft OneNoteA flexible cross-platform notebook with offline access, collaboration, OCR, transcription, and Copilot.9.0
Also Ranked In
Comet is ranked in 2 of our directories.
Used Comet? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Comet for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Comet is listed in our AI Note-Taking Apps directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/comet-ai-note-taking-app/"><img src="https://www.itechguides.com/best/badge/comet-ai-note-taking-app.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update