Privacy Policy
Effective 8 October 2026 · Version 3.1
1. Who we are
Vow is developed by Anton Kremer (“we”). For any privacy question write to [email protected].
2. What we do not collect
The app does not send us, and we do not store:
- your name, email, phone number or any account;
- your vows, progress, history, diaries or notes;
- your photos, contacts, calendar, location or health data;
- advertising identifiers or behavioural analytics.
Vow contains no analytics SDKs (such as Firebase, Mixpanel, Amplitude or AppsFlyer) and no advertising integrations. We do not sell, rent or share data, because we do not have it.
3. What stays on your device
The following is stored only on your iPhone, inside the app’s sandbox and its shared container for widgets:
- your age range (13–17 or 18+) and, if you enter it, your first name;
- your challenges, askeses and events, their check-ins, results and certificates;
- event diaries and notes;
- your Year Intention: checkpoints, notes, practices and up to five reference photos;
- images you attach to an askesis;
- settings: language, theme, notifications;
- a short summary of today’s vows and your Year Intention for widgets and Live Activities.
This data is part of your regular iPhone backup. It is deleted when you delete the app, or earlier with Settings → Privacy → Delete all my data.
On your request, Vow can put a copy of this data into one file (Settings → Privacy → “Save a data backup”). The file is created on your device and is not sent anywhere: you decide where to save it and whom to share it with.
4. Paired askesis and iCloud
When you create or join a paired askesis, Vow uses Apple’s CloudKit (iCloud) to connect the two devices. A record is created in Vow’s public iCloud database containing:
- a random participant identifier generated on your device for each of you (not your Apple ID and not your name);
- the invite code;
- which askesis it is, its duration, the start date and the check-in window settings;
- whether each participant is still in the askesis, and the time of the latest “I’m here” signal.
We do not use these records for anything other than connecting the pair. Delete all my data also attempts to remove them from iCloud. Paired askesis requires an iPhone signed in to iCloud on both sides.
5. Notifications
Reminders are local notifications scheduled on your iPhone. They are not sent through any server. You can change them in the app or in iOS Settings.
6. Payments
Vow is free. The app has no in-app purchases or subscriptions and receives no payment data.
7. This website
vowapp.app is hosted on Cloudflare and sets no cookies. We may use Cloudflare Web Analytics, which counts page views without cookies and without identifying visitors. Fonts are loaded from Google Fonts, so your browser connects to Google’s servers to download them.
Before launch this site had a form for a one-time launch notice. The form is closed. Addresses received through it are used only for that one message and are deleted afterwards. You can ask us to delete yours earlier at [email protected].
8. Children
Vow asks for age when it first opens. Under 13 the app does not open. From 13 to 17 it works without askesis. Vow does not collect personal data from anyone, whatever their age.
9. Your rights
Because the app keeps your data on your device, you control it directly: you can see it in the app, change it and delete it at any time. If you are in the European Union, the United Kingdom or another place with similar laws, you also have the right to ask us what data we hold about you and to have it corrected or deleted. For the launch notice list, write to [email protected]; we answer within 30 days. You may also complain to your local data protection authority.
10. Health
Vow is not a medical service and does not replace professional advice. If you have a medical condition, an addiction, an eating disorder or are pregnant, talk to a qualified professional before starting an askesis. If you feel unwell, stop the practice and seek help.
11. Changes
If this policy changes, the new version will appear at this address with a new date and version number. Significant changes will also be mentioned in the app’s release notes.