Keryx

日本語

One reader. Every device.

A local-first, cross-platform RSS reader

🌐 Website: https://keryx.merc.works

Features

• Multi-device sync: via cloud storage (Dropbox / OneDrive / Google Drive — on Android, Google Drive requires Google Play services, so a device without it is offered Dropbox and OneDrive)
• Local-first: no central server; works fully offline without sync
• Fast local full-text search: instantly search article titles and content by keyword
• Organize feeds with tags and folders: tags for cross-cutting labels, folders for hierarchical grouping
• RSS 2.0 / Atom 1.0 support: RSS 1.0/RDF is also loosely parsed
• OPML import & export: migrate to or from other RSS readers and back up your subscriptions
• English and Japanese UI: follows your system language
• Completely free: no freemium, no trial period, no ads
• Open source: source code is public and can be inspected or modified by anyone

Download

Platform	Requirements	Get it
Windows	x86_64	.msi / portable ZIP from the Releases page
macOS (native app)	macOS 14 (Sonoma) or later on Apple Silicon	.dmg from the Releases page
Linux	x86_64 / arm64	Snap Store, or .deb / .rpm / portable ZIP from the Releases page
Android	Android 8.0 or later	F-Droid, or .apk from the Releases page

iOS/iPadOS support is planned. The F-Droid build has no Google Drive sync (Dropbox and OneDrive work as usual).

[!IMPORTANT] Windows: Until a code-signing certificate is in place, the .msi is unsigned, so Windows SmartScreen shows a "Windows protected your PC" warning on first run. Click "More info", then "Run anyway" to continue.

Android: if you install from F-Droid, no extra steps are needed. The .apk from the Releases page is distributed directly (sideloaded), so Android will ask you to allow installing from this source the first time you install it from the app you used to open it (e.g. your file manager or browser).

Once Keryx is running, it can check for, download, and install newer releases on its own — from the notification bell, the task tray, or Settings → Updates (on macOS, from Keryx → Check for Updates… in the menu bar, or automatically, as set in Settings → General). The Windows and Android steps above are therefore only needed for the first install: an update Keryx downloads itself is not a browser download, so it never triggers Windows SmartScreen's "unsigned file" prompt, and on Android the "allow installing from this source" permission is granted only once, not on every update.

In-app updates work for the macOS app, a Windows .msi/portable install, a Linux portable install, and an Android .apk from the Releases page. A Linux .deb/.rpm or Snap install instead opens the release page — Keryx still tells you a new version exists, just not by installing it itself there. Update a .deb/.rpm install through your package manager; a Snap install is updated automatically by the Snap Store, so there is nothing to download from that page. The F-Droid build leaves updates entirely to the F-Droid client, so it has no in-app update at all.

Development Documentation

• design documents
• build instructions and development environment setup
• packaging (creating distributable apps)

Other

• Privacy Policy
• Terms of Service
• License (MIT)