Privacy Policy
Last updated: October 13, 2026
1. Overview
Kaisei is a private, on device recovery and readiness app developed by Orochi Systems for iPhone and Apple Watch. It reads the health data your Apple Watch and iPhone already record and turns it into a daily recovery score, a sleep read, a stress read, and a view of your vitals. Kaisei is built around a single principle. Your biometrics are computed and stored on your devices and are never uploaded to an Orochi Systems server.
2. No Account and No Orochi Systems Backend
Kaisei does not require an Orochi Systems account, and there is no Orochi Systems login, cloud, or backend for your data. The App contains no networking code of its own, no third party software development kits, no advertising, and no analytics service. It does not transmit your heart rate variability, resting heart rate, sleep, vitals, scores, tags, notes, feelings, coach conversations, or insights to Orochi Systems or to anyone else. The App's privacy manifest declares no collected data and no tracking.
3. Apple Health (HealthKit) Data That Kaisei Reads
With your permission, Kaisei reads health data from Apple Health to compute your scores. Depending on what your devices record and what you allow, this can include heart rate and heart rate variability, resting heart rate, sleep, respiratory rate, blood oxygen, wrist temperature, steps, active energy, workouts and effort, cardio fitness, your date of birth, and, only if you allow it, menstrual cycle data used to read your mornings against what is normal for your cycle phase. On Apple Watch, Kaisei reads heart rate during workouts you start there to calculate live strain and load. HealthKit data is used on your device to produce your scores and insights. It is never used for advertising or marketing, never sold, and never shared with third parties. You can review and revoke Kaisei's Health permissions at any time in the Apple Health app.
4. Apple Health Data That Kaisei Writes
Kaisei writes to Apple Health only when you ask it to, and both options are off until you turn them on. - Save breathing to Health, under Settings on your iPhone, saves breathing sessions you complete on your iPhone or your Apple Watch as mindful minutes. Your Watch follows this one switch and has none of its own for breathing. - Save to Apple Health, on the Apple Watch workout picker, saves workouts you track with Kaisei on your Watch, including their heart rate and active energy. Kaisei writes no other Apple Health data. Samples you chose to save belong to Apple Health and stay there even if you later erase your Kaisei data.
5. Information You Give Kaisei
Kaisei keeps a small profile you fill in yourself, such as your first name, what you are training for, your sleep type, your training days, and your preferences for language, units, reminders, and appearance. You can also tag your nights, create your own tags, log how you feel, backfill past nights, and run experiments. All of this is stored on your device and used there. Your first name is used only to address you inside the App.
6. Local Storage and Sharing Between Your Devices
Kaisei stores your computed results, tags, feelings, experiments, streak, milestones, settings, and derived insights in local storage on your device. It uses a shared app group container so the iPhone app, widgets, the Lock Screen glance, and complications can read the small amount of data needed to show their surfaces. Derived scores and context are sent directly to your own paired Apple Watch so the watch app and its complications can show them. This data stays on your devices.
7. Optional iCloud Backup
Under Settings, DATA & PRIVACY, you can turn on iCloud backup so a new iPhone or a reinstall does not reset your progress. It keeps only your streak, your tag history, and your custom tag names in your own private iCloud, using Apple's key value store. Your health readings and scores are never part of this backup, and the Medication tag never leaves your iPhone. The backup is tied to the Apple Account signed in on your device, not to an Orochi Systems account, and Orochi Systems cannot read it. Turning the switch off deletes the backup from iCloud, and Delete all my data erases it as well. Apple processes iCloud data under Apple's own terms and privacy practices.
8. The Coach
Ask Kaisei answers questions about your own data. On devices that support Apple Intelligence it uses Apple's on device language model, briefed with a summary of your recent data. The conversation never leaves your device. On other devices the coach answers from Kaisei's own built in rules. In both cases the conversation is not saved. It exists only while the sheet is open and is discarded when you close it.
9. Journal Readings, Experiments, and the Sunday Letter
Kaisei uses your tags and feelings on your device to compare mornings after a behaviour with mornings without it, to run before and after experiments, and to write a weekly letter about your week. These use local statistics only. Nothing is uploaded, and no one but you sees the result.
10. Subscriptions and Purchases
Kaisei Pro is sold through Apple's App Store using StoreKit. Purchases, subscription status, free trials, introductory offers, and restores are handled by Apple. Kaisei receives only the entitlement information needed to unlock Pro, and it does not receive or store your name, your Apple Account details, or your payment card details. Kaisei remembers on your device that a one time introductory offer has been shown, so it is not shown again. Apple processes billing under Apple's own terms and privacy practices.
11. Notifications
If you allow notifications, Kaisei schedules local notifications on your device, such as the morning recovery alert, an evening wind down cue, an evening reminder to wear your watch, a rare trend alert, the Sunday letter, and trial reminders. No notification carries a score or any health value, because its words can appear on your Lock Screen depending on your iPhone's notification preview settings. Notifications are scheduled locally, no push server is involved, and you can manage or revoke the permission in Apple settings.
12. Widgets, Lock Screen, Complications, Siri, and Shortcuts
Kaisei can show your recovery score and related summaries on Apple system surfaces such as Home Screen and Lock Screen widgets, StandBy, the morning glance on the Lock Screen and in the Dynamic Island, watch face complications, App Intents, Siri, and Shortcuts, so you can see or ask for your recovery without opening the App. These surfaces read the same local data and do not send it to Orochi Systems. Anything shown on your Lock Screen or watch face can be seen by someone looking at your device, and you can remove any of these surfaces or turn the morning glance off under Settings, DAILY RHYTHM.
13. Time Zone and Travel
Kaisei does not request or use your location. For travel guidance it compares your iPhone's current time zone with a home time zone stored on your device, which you can reset under Settings, CONNECTIONS.
14. Share Card
When you choose to share a card from Today, or the report from Trends, Kaisei renders an image on your device that contains the score or summary you picked, and hands it to the iOS share sheet. It goes only where you send it. If you choose Save Image there, iOS first asks whether Kaisei may add to your photos. That permission lets Kaisei add images and nothing more. It cannot see, read or change anything already in your photo library, and you can withdraw it at any time in the Settings app under Privacy & Security, Photos. Once shared, the image is outside Kaisei's control, so share health information with care.
15. Help Pages and Contacting Us
Help and Support, Terms of Service, and Privacy Policy open from Settings in a Safari view provided by iOS and are served from orochisystems.com. Like any website, the server receives standard request information such as your IP address and browser type when a page loads. Kaisei passes no health data, identifier, or App data to these pages, and the pages do not run inside the App itself. Contact Us opens a mail in your own mail app. The subject is filled in with your Kaisei version, build number, and iOS version, and nothing else is attached. If you write to us, we receive your email address and whatever you choose to include, and we use it only to answer you. Please do not send health data you would not want us to see.
16. Data Export and Deletion
Under Settings, DATA & PRIVACY, Export my data saves everything Kaisei knows as one readable file that you choose to save or share. The file is prepared only when you commit to sharing it, is kept in protected temporary storage that is excluded from device backups, and is cleaned up afterwards. Protect exported files after they leave the App. Delete all my data erases your history, tags, feelings, experiments, streak, and profile from your iPhone, your paired Apple Watch, and your iCloud backup. It cannot be undone. The erasure on your iPhone is immediate. Your Apple Watch clears its copy when it next receives the request from your iPhone, and the iCloud backup is removed when iCloud acknowledges the deletion, which can take some time; the App says so right after the deletion if either is still pending. Samples in Apple Health are not removed, including any mindful minutes or Watch workouts you chose to save there. Deleting Kaisei from a device removes its local data on that device. Beta builds distributed through TestFlight can also export a separate diagnostics file that contains only coarse counts and dates of setup steps and no health values. It leaves your device only if you choose to share it. Apple may provide us with crash and usage information from TestFlight and the App Store under Apple's own terms, where you have agreed to share it with developers.
17. Analytics, Ads, and Tracking
Kaisei contains no advertising software, no cross app tracking, and no analytics service, and Orochi Systems does not sell personal data. Kaisei does not ask for tracking permission because it does not track you. If analytics are ever introduced in a future version, they will be disclosed in the App first and this policy will be updated.
18. Security
Kaisei relies on Apple platform security, device encryption and sandboxing, the app group container, and Apple's encrypted transport for iCloud and for communication with your Apple Watch. No storage or sync system can be guaranteed completely secure, but by keeping your health data on your devices Kaisei minimizes exposure by design. Protecting your iPhone and Apple Watch with a passcode protects your Kaisei data too.
19. Retention
Kaisei keeps your data on your devices until you delete it, with Delete all my data or by deleting the App. Because Orochi Systems holds none of your App data, there is nothing for us to retain or delete on your behalf. Support emails are kept only as long as needed to help you and to keep a record of the request.
20. Your Rights
Because your Kaisei data lives on your own devices, you exercise most privacy rights directly. You can see it in the App, take a copy with Export my data, correct your profile and tags, and erase everything with Delete all my data. You can withdraw Health permissions in the Apple Health app at any time. If privacy law where you live, such as the GDPR or the KVKK, gives you further rights regarding information you have emailed to us, write to kaisei@orochisystems.com and we will respond.
21. Not a Medical Device
Kaisei is a wellness and fitness tool, not a medical device. Vitals, sleep, stress, and recovery are framed as personal awareness, never as diagnosis. Kaisei does not diagnose, treat, cure, or prevent any condition and is not intended for emergency monitoring.
22. Children's Privacy
Kaisei is not directed to children under 13, and we do not knowingly collect personal information from children under 13.
23. International Users
If you use Kaisei outside your home jurisdiction, local privacy laws may apply. Apple may process operational data such as App Store billing and iCloud under its own infrastructure and legal obligations.
24. Changes to This Policy
We may update this Privacy Policy from time to time. Updates will be posted on this page with a revised "Last updated" date.
25. Contact
If you have privacy questions about Kaisei, contact us at kaisei@orochisystems.com, use Contact Us in the App under Settings, or visit https://orochisystems.com/kaisei/support.