Try one thing. See what changed.
Doze is made by one person. If something is broken, confusing, or missing, email me and I will read it and reply.
Usually a reply within two days. Telling me your iPhone model, iOS version, and the Doze version (Settings → Version) makes a bug report much faster to fix.
You need something that records your sleep into Apple Health — an Apple Watch, or another sleep tracker that writes to Health. Doze reads the nights that are already there; it does not track sleep itself.
Open the iPhone Settings app → Health → Data Access & Devices → Doze, and check that Sleep is turned on. Doze only asks to read, never to write. If it is already on, open Doze → Settings → Refresh Apple Health. Sleep data can also take a few hours to sync from a watch after you wake up.
Doze shows an early read after about seven usable nights, and keeps watching until the pattern is solid enough to call — usually around fourteen. Nights with no Health data do not count toward that, so a week with a few gaps takes a little longer.
Because two changes at once cannot tell you which one worked. That limit is the whole method, not a missing feature.
Yes, and it has no subscription. If a paid unlock is ever added, everyone who installed Doze while it was free keeps full access permanently.
Doze → Settings → Reset app removes every experiment and cached night from the device. Deleting the app removes everything else. Doze does not create a user account or attach requests to your name, email address, or a device identity, so server records cannot be looked up by person. Aggregate verdict responses are automatically removed within seven days, suggestion responses within 24 hours, and operational request hashes within 30 days. You can email dozeapp@vivekkairi.com with an approximate request time if you need help investigating a server record.
Last updated 2 August 2026.
Doze is built to keep raw health data on your phone. There is no account, no login, and no profile.
Doze reads sleep data from Apple Health on your device, with your explicit permission. It never writes to Apple Health. Raw Health samples remain on the device and are never uploaded, sold, or shared. You can revoke access at any time in the iPhone Settings app under Health → Data Access & Devices.
When you use AI wording for a result, Doze sends a short aggregate summary such as medians, counts, signal categories, and coverage to its backend. It does not send raw HealthKit samples, email addresses, or an account/device reference with that summary. Doze also keeps your written notes on the device; they are not sent to the wording service. Experiment labels and limited experiment history can also be sent when you ask Doze for suggestions, so it can avoid repeating ideas. Product-usage events may be sent to PostHog even when you do not use AI wording.
The app may also send experiment labels and limited experiment history context to Doze's backend for suggestion ranking and filtering. The configured model provider (currently DeepSeek) may receive those labels along with aggregate status, outcome, and signal context so it can avoid suggesting an experiment you have already tried. It does not receive the nightly arrays, raw HealthKit samples, written notes, email addresses, or an account/device reference. DeepSeek is a service provider, not an identity system for Doze; its processing, retention, and international transfer terms are described in its privacy policy.
Doze records product analytics — events such as starting an experiment, reaching a result, a morning rating, and coarse counts — using PostHog, to understand whether the app works for people. These events contain no raw HealthKit samples, notes, names, or email addresses. PostHog may receive a random analytics identifier and technical diagnostics from its SDK; Doze does not link those to your identity or use them for advertising.
Doze is not directed at children under 13 and does not knowingly collect data from them.
If this policy changes, the date above changes with it, and material changes will be noted in the app's release notes.
Questions about privacy: dozeapp@vivekkairi.com
Doze is not a medical device and does not diagnose, treat, or prevent any condition. It reports what your own sleep data did while you tried a change. If you are worried about your sleep, talk to a doctor.