Comet review
A focused offline Markdown notebook for users who value local storage over AI features.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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.
Comet pros and cons
- 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
Comet fact sheet, pricing and score →
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