Frequently Asked Questions

In Chinese medicine the tongue is treated as a small map of the whole body. Its colour, coating, shape and moisture each correspond to traditional patterns. Lotang reads those signals the way a practitioner would, then writes them as a letter you can revisit, for wellness reflection, not medical diagnosis.

It is analysed entirely on your device; the image is not uploaded. Only the derived observations (colour, coating, shape, moisture) and any symptoms you choose are sent to build your reading. No artificial intelligence is involved at any point. See the Privacy Policy.

Lotang checks that the photograph really is a well-lit, close, fully extended tongue before it reads anything. A rejected photo does not count against your daily limit. The usual causes are: too far away, dim or yellow light, the tongue only partly out, or the face filling the frame. Move to a window, come closer, and fill the oval.

Because the tongue itself changes: sleep, food, stress, the season. That is the whole point of reading it daily. Small drifts across a week tell you far more than any single snapshot.

No. Lotang shares wisdom for reflection. It is not medical advice and is not a substitute for a doctor. If something in your body is asking for help, please see a qualified practitioner.

The Weekly path gives your regular readings, five-element scoring, foods, seasonal and body-clock guidance. The Yearly Companion adds the classical herbal companion, reading comparison and journey trends, and up to seven loved ones, and includes ✦ Founder Member status for the first 100 members.

Because food is medicine in this tradition, and the wrong food at the wrong time can be the wrong medicine. What you tell us is used only to filter what is suggested to you, never for advertising or profiling.

A streak counts the calendar days since your last gap of three or more missed mornings. One or two skipped days do not reset it; life is allowed to happen.

Yes. Open any reading and tap Share; Lotang composes a card you can send wherever you like. Your readings are always yours.

The Yearly Companion supports up to 8 profiles, yourself and seven loved ones, each with its own readings and history. Please add someone else's profile only with their agreement.

Settings → Account & subscription → Manage subscription opens the App Store or Google Play subscription page, where the cancel control lives. Cancel at least 24 hours before the renewal date. Deleting the app does not cancel a subscription.

• iOS: apps.apple.com/account/subscriptions
• Android: play.google.com/store/account/subscriptions

Settings → Account & subscription → Restore purchases, using the same Apple or Google account you bought with. If it still doesn't unlock, write to us with the store receipt and we'll sort it out.

Settings → Account → Delete Account permanently removes your server-side readings, profiles and avatars. To request a copy of your data instead, write to support@lotang.app.