Halkyon
Install latest/edge of Halkyon
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install halkyon --edgeDon't have snapd? Get set up for snaps.
Details for Halkyon
Package name
- halkyon
License
- AGPL-3.0-or-later
Last updated
- 13 November 2026 - latest/edge
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Learn with flashcards, studied offline and synced between your devices
Halkyon is a spaced-repetition app for your own material: studysets of flashcards, notes, learning paths and PDFs, reviewed on an FSRS schedule. Every studyset is made by its learners: build yours for any subject, or copy one that someone published. It works offline and syncs between your devices.
Learn from what you watch: play films and shows from your Jellyfin server, and every subtitle line is split into dictionary words, with readings above and the translation below. Tap a word, and it is a flashcard.
Dictionaries for Japanese, Chinese, Korean, German, Greek and English; kanji, hanzi and Hangul written by hand, each stroke checked; exam plans for the JLPT, HSK and Korean levels, with a daily pace to your exam's date; and studysets published to Explore and copied, later releases coming in as merges that keep your own edits.
You sign in with SimpleLogin, by Proton, or with an email address, a password and an authenticator app. It connects to halkyon.li, the project's instance, or to any other: everything an instance needs is in the repository, to run your own. The app is AGPL-3.0 and the server SSPL-1.0, so all of its code is public.
Questions and reports: support@halkyon.app
| Revision | Channel | Version | Build | Commit | Download SBOM |
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The build and commit information is derived from build infrastructure records.
Install Halkyon on your Linux distribution
Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.
