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Software · Office & notes

Fenmark

An encrypted, local-first desktop journal.

  • Completely free
  • Windows, macOS and Linux
  • Open source
  • No account

Overview

Fenmark is a journaling program, available on Windows, macOS and Linux.

Features described in its Flathub listing, on its official website and in its Winget manifest: offline use, data encryption and Markdown support.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “AES-256-GCM encryption, local-first storage, no cloud, no telemetry.” — official website, 10 November 2026
  • “Fenmark is a private offline journal app for Windows, macOS & Linux.” — official website, 10 November 2026
  • “AES-256-GCM encryption, local-first storage, no cloud, no telemetry.” — official website, 10 November 2026
  • “Export to JSON and Markdown” — Flathub, 10 November 2026

At a glance

All of Fenmark is free: no feature is locked behind a paid plan, and its code is open.

Its licence (MIT) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • No account needed
  • Commercial use allowed

About

Fenmark (formerly Mini Diarium) is a private journaling app for your desktop. All diary entries are encrypted with AES-256-GCM at rest — plaintext never touches disk. Your journal stays entirely on your machine: no cloud sync, no network connections, no telemetry. Features include: AES-256-GCM encryption for all entries Multiple journals with independent passwords Rich-text editor (bold, italic, headings, lists, images) Calendar navigation and entry browsing Import from Mini Diary, Day One, and jrnl formats Export to JSON and Markdown Auto-lock on idle or OS screen lock Key-file authentication as an alternative to passwords

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Unspecified source (platforms) —
  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 7 November 2026
  • Description from Flathub — AppStream (Flathub)

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