Comet

Free plan LinuxMac

What Comet is

Comet is a free Markdown notes app for macOS and Linux that keeps notes on the user's device in SQLite. The site says no server is needed to use it, and writing can begin without an email, password, account, or sign-up. Its listed core tools include a Markdown editor, notebooks, tags, full-text search, and an archive flow. Notes use Markdown, which the project describes as portable and exportable.

Comet is open source under the MIT License, with a listed plan at no cost. For synchronization, the project README describes Nostr and Blossom-based encrypted storage. The site says note content is encrypted before upload, so the relay and Blossom servers receive ciphertext rather than readable note content. Downloads are listed for macOS ARM and Intel, and Linux in AppImage, .deb, and .rpm formats. A mobile experience and deeper synchronization across devices remain future roadmap items; note linking and publishing notes to Nostr are also listed as next steps.

Who it suits

Comet suits people who want local Markdown notes on macOS or Linux, with notebooks, tags, and full-text search. It may be less suitable for people who need a mobile app or deeper cross-device synchronization now.

What it does well

Notes are stored locally in SQLite
No account or sign-up is required to write
Includes full-text search, notebooks, and tags
Open source under the MIT License
Encrypted sync is described in the project materials

What to know first

Available for macOS and Linux only
Mobile experience is future work
Deeper synchronization across devices is future work
Note linking and Nostr publishing are listed as next steps

Plans

Plan	Billed and limits	Price
Comet	No sign-up · Open source under MIT License	Free

As comet.md lists them, read 11 Oct 2026. The maker's own page has the final word.

Verdict

Comet offers local-first Markdown note-taking with core organization and search features. Its current platform support is desktop-focused, while mobile use and deeper cross-device sync are future work.

Facts from Comet's own pages

Accounts: The site says no email, password, account, or sign-up is required to start writing. · comet.md, 11 Oct 2026
Current features: The listed core note-taking features are a Markdown editor, notebooks, tags, full-text search, and an archive flow. · comet.md, 11 Oct 2026
Desktop platforms: The download links list macOS ARM, macOS Intel, and Linux AppImage, .deb, and .rpm builds. · comet.md, 11 Oct 2026
Downloads: The site links downloads for macOS ARM, macOS Intel, and Linux in AppImage, .deb, and .rpm formats. · comet.md, 11 Oct 2026
Encrypted sync: The site says note blobs are encrypted before upload, so the relay and Blossom server see ciphertext rather than content. · comet.md, 11 Oct 2026
Encryption: The site says note content is encrypted before sync uploads, so relay and Blossom servers see ciphertext rather than content. · comet.md, 11 Oct 2026
Free plan: Yes · comet.md, 20 Sept 2026
Integrations: The project README describes encrypted sync with Nostr and encrypted blob storage with Blossom. · github.com, 11 Oct 2026
License: The site states Comet is open source under the MIT License. · comet.md, 11 Oct 2026
Local storage: Notes are stored locally in SQLite, and the site says no server is required to use the app. · comet.md, 11 Oct 2026
Markdown: Notes use Markdown, which the site describes as portable and exportable. · comet.md, 11 Oct 2026
Mobile: The roadmap describes a mobile experience as a future expansion. · comet.md, 11 Oct 2026
Note features: The site's current roadmap lists local notes, a Markdown editor, notebooks and tags, full-text search, and an archive flow as core note-taking features. · comet.md, 11 Oct 2026
Offline access: Yes · comet.md, 20 Sept 2026
Open source: The site says Comet is open source under the MIT License. · comet.md, 11 Oct 2026
Product: Comet is a Markdown note-taking app designed for local capture, encrypted syncing, and decentralized publishing. · comet.md, 11 Oct 2026
Publishing: The roadmap lists a simple publish flow to Nostr as a next step. · comet.md, 11 Oct 2026
Publishing and sync: The roadmap lists note-to-note linking, publishing to Nostr, and desktop-to-desktop sync as next steps. · comet.md, 11 Oct 2026
Roadmap limit: The site lists mobile experience and deeper sync across devices as future work. · comet.md, 11 Oct 2026
Security approach: The maker says notes begin on the user's device and are encrypted before leaving it during sync. · comet.md, 11 Oct 2026
Support: The site links to the project's GitHub repository and its X account. · comet.md, 11 Oct 2026

Where Comet stands on Freedom251

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