Terms of Service

Effective date: 2026-10-11 · Applies to: Keryx (desktop, Android, and iOS / iPadOS)

These Terms of Service (“Terms”) govern your use of Keryx, a free, open-source, local-first RSS reader. Please read them together with the Privacy Policy, which explains how the app handles data.

Acceptance of these Terms

By downloading, installing, or using Keryx, you agree to these Terms. If you do not agree, please don’t use the app.

What Keryx is

Keryx is free software: no account, no subscription fee, and no server operated by the developer. It runs locally on your device and optionally syncs your data through a cloud storage account you control (Dropbox, OneDrive, or Google Drive — on Android, Google Drive requires Google Play services to be installed, enabled, and up to date) — see the Privacy Policy for details on what that involves.

Source code license (MIT) — unaffected by these Terms

These Terms govern your use of the Keryx application. The source code itself is licensed separately and unconditionally under the MIT License (see LICENSE), which already grants you the right to use, copy, modify, merge, publish, distribute, sublicense, and sell the software. Nothing in these Terms restricts or narrows those rights. Bundled third-party libraries are listed, with their own licenses, in THIRD-PARTY-LICENSES.md.

Eligibility

You must be legally capable of entering into a binding agreement under the laws that apply to you in order to use Keryx.

Third-party content (RSS/Atom feeds)

You choose which feeds to subscribe to. Article content, titles, and metadata shown in the app are fetched directly from the third-party sources you subscribe to. The developer does not review, control, or endorse that content and is not responsible for it.

Optional third-party services (Dropbox / OneDrive / Google Drive)

If you enable cloud sync, you are also bound by the terms of service of the provider you connect (Dropbox, Microsoft, or Google, respectively). The developer is not a party to those services, does not operate them, and has no control over their availability or behavior. See the Privacy Policy’s cloud sync section for what data is involved.

The Dropbox, OneDrive, and Google Drive names and logos are trademarks of their respective owners (Dropbox, Inc.; Microsoft Corporation; Google LLC). They are used here solely to identify the corresponding service you may choose to connect, and their use does not imply endorsement, sponsorship, or affiliation.

If you got Keryx from Apple’s App Store

If you downloaded Keryx from Apple’s App Store (iOS, iPadOS), these Terms are between you and the developer only, not Apple, and the following also apply:

Apple is not responsible for Keryx or its content, and has no obligation to provide maintenance or support for it.
If Keryx fails to conform to any applicable warranty, you may notify Apple, which will refund the purchase price if there is one (Keryx is free); to the maximum extent permitted by law, Apple has no other warranty obligation for Keryx.
The developer, not Apple, is responsible for addressing any claim relating to Keryx or your use of it, including product liability claims, claims that it fails to meet a legal or regulatory requirement, and consumer-protection claims, and for any third-party claim that Keryx or your use of it infringes intellectual property rights.
You represent that you are not located in a country subject to a U.S. Government embargo or designated a “terrorist supporting” country, and that you are not on any U.S. Government list of prohibited or restricted parties.
Apple and its subsidiaries are third-party beneficiaries of these Terms, and once you accept them Apple will have the right (and be deemed to have accepted the right) to enforce them against you.
Apple’s Licensed Application End User License Agreement applies to your use of the App Store copy of Keryx in addition to these Terms; if the two conflict on a matter between you and Apple, Apple’s agreement prevails. The MIT License of the source code is unaffected.

No warranty

Keryx is provided “AS IS”, without warranty of any kind, express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, and non-infringement — the same disclaimer already stated in LICENSE, restated here in plain terms. There is no guarantee of uninterrupted operation, that any given feed will remain reachable or parseable, or that the app is fit for any particular purpose.

Limitation of liability

To the maximum extent permitted by applicable law, the developer is not liable for any damages arising from or related to your use of, or inability to use, Keryx.

Changes and discontinuation

Keryx is maintained on a best-effort, volunteer basis. Features, availability, and the app itself may change or be discontinued at any time, without notice and without obligation to continue development, support, or distribution.

Changes to these Terms

These Terms are version-controlled along with the rest of the source code. Their history of changes is publicly visible at https://github.com/shimataro/keryx/commits/HEAD/TERMS.md. Continuing to use the app after a change means you accept the updated Terms.

Governing law

These Terms are governed by the laws of Japan.

Severability

If any provision of these Terms is found unenforceable, the remaining provisions continue in full effect.

Contact

Questions about these Terms can be raised via GitHub Issues: https://github.com/shimataro/keryx/issues.