HydraFE Privacy Policy
HydraFE is a player-made app for playing GemStone IV, a game run by Simutronics. It is not made by or affiliated with Simutronics. This policy says what HydraFE does with what you give it.
What HydraFE collects
Nothing. HydraFE has no account of its own, no analytics, no advertising, and no tracking. It sends nothing about you to its maker or to anyone else, beyond the push relay described below, if you use push.
What stays on your phone
- Your GemStone IV account name and password, when you log in on the phone and ask HydraFE to keep the password. They are kept in the iPhone’s Keychain, on this device only, and are not included in backups.
- The computers you pair with: each one’s name, address, port and pairing code, kept in the Keychain on this device only.
- What your characters play: the game’s text, your settings and Hydra’s logs, kept in the app’s own folder on the phone. Deleting the app deletes them.
Where your information goes
- To Simutronics, when you log in on the phone: your account name and password go to Simutronics’ login service, and your play goes to and from its game servers, as with any GemStone IV client. Simutronics’ own terms and privacy policy cover what it does with them.
- To your own computer, when you play through Hydra running on a computer on your home network: the app shows that computer’s page, and what you type goes to it. Nothing passes through anyone else.
Push notifications
Push is optional: it is on only if you allow notifications and give a trigger in Hydra a push action. Then your computer’s Hydra sends each alert, sealed so that only your phone can read it, to a relay run for HydraFE, which hands it to Apple. While it passes an alert along, the relay sees your phone’s Apple push address; it stores neither that address nor the alert. It keeps only a one-way fingerprint of each computer’s own access token. The relay’s web server keeps the usual request log (time, network address, and which page was asked for) for about two weeks. Apple’s own privacy policy covers what Apple does when it delivers the alert.
What the app asks permission for
- Local network: to find Hydra running on your computers at home, and to connect to it.
- Camera: only to scan the pairing code your computer’s Hydra shows. No picture is kept or sent anywhere.
Children
HydraFE is not directed at children under 13 and collects nothing from anyone.
Changes
If this policy changes, the new version is posted at the same address, with the date below.
Contact
Questions about this policy: nisugi.gs4@gmail.com
Last updated: 25 October 2026.