Daymarch is an iOS game that turns your real-life activity into a daily fantasy adventure. Your Apple Health data becomes a character, your activity sets and meets daily goals, and a narrated story follows along. This policy explains, in plain language, exactly what data the app and its server collect and what happens to it. It is written to match what the software actually does.
Daymarch is run by a single independent developer, Mark Rossetti. You can reach me any time at mark.a.rossetti@gmail.com.
The app reads Apple Health (HealthKit) data on your device, with your permission, and uploads one summarized value per metric per day — daily aggregates only, never raw samples, never a continuous stream, and never your location. You choose in Health which categories to grant, and the app only uploads what you have granted. The daily metrics fall into these categories:
If you record a workout by hand with the app’s quick-log, Daymarch writes that workout — with its rough, clearly-estimated calorie figure — to Apple Health, marked as user-entered. Workouts you log yourself are the only thing the app ever writes to Health, and each entry is yours to edit or delete in the Health app at any time. Once written, it counts in your daily aggregates like any other workout.
Daymarch’s daily story chapters are written by a large language model. To generate a chapter, the server sends Anthropic’s API a structured summary of your game day: your character and party names, the day’s goals and how far you got (for example, “18 of 18 minutes of mindful minutes”), the day’s outcome and streak, and short story notes about which stats rose or fell that day (for example, a note that rest improved a stat). Raw health data is not sent — only these derived daily facts. These prompts and the generated story text are also stored in our database for quality and debugging.
Anthropic processes this data as a service provider under its commercial terms of service; it is not used for advertising and is not sold. See Anthropic’s commercial terms for how they handle API data.
If you join a party, the other members of that party can see your character’s name and calling, your daily goals and live progress toward them (targets, amounts, and percentages), your daily outcomes and streak, and the shared story chapters your days help write. They cannot see your underlying health metrics beyond what your goals reveal. Party activity can also reach you as notifications — a nudge when a partymate finishes a training session, a cheer sent back, or an end-of-day rally — and each of these can be turned off any time in the app’s Beacons settings. If you leave a party, past shared chapters remain part of that party’s story.
Your data is kept for as long as your account exists. To delete your account and all associated data, email mark.a.rossetti@gmail.com from the address associated with your account (or include your account details). Account deletion is currently handled manually by the developer — there is no in-app delete button yet — and will be completed promptly on request. Deleting the app from your phone stops all uploads immediately; revoking Health permissions does the same for any category at any time.
Daymarch is not directed at children under 13, and we do not knowingly collect data from them.
If this policy changes, the new version will be posted at this address with an updated effective date. During private testing, meaningful changes will also be mentioned in TestFlight release notes.