How Kella looks after your information

Kella is operated by Kella Health Limited (Company No. 17500821), Red House Farm, Red House Lane, Altrincham WA14 5RL. Kella Health Limited is the data controller for your Kella account, your wearable connection, Kella Rewards and the emails Kella sends you. Your clinic is the data controller for your clinical information: your check-ins as read by your clinician, lab results, reports, session notes and treatment plans. Kella Health processes that information on your clinic's instructions under a written agreement. You can reach us at hello@kellahealth.co.uk.

Your name, email address, date of birth, sex recorded at birth and main goal, which you give us when you set up your profile. Your daily check-ins, including what you choose to tell us about your sleep, water intake, diet, bowel habit, alcohol and caffeine, symptoms and stress; what you log each day under nutrition, activities, treatments and lifestyle (including exercise, medications and supplements); your weekly reflections; and your notes and self-care routine progress. If you connect a wearable, the sleep, heart rate (including readings through the day), heart-rate variability, steps, activity and workout data you allow Kella to read from your Google account, and the Recovery score and any "tense stretch" prompts Kella works out from it. Lab results that your clinic adds to your record or that you upload yourself, once your clinical team has reviewed and released them. If you switch on a condition profile — lymphoedema or lipoedema, oncology, fertility, perimenopause or menopause, post-surgical recovery, pregnancy or postnatal, long COVID or chronic fatigue — the set-up details you enter (for example your treatment stage, procedure or due date), the daily symptoms you tap, any weekly symptom scale answers, and for lymphoedema or lipoedema your limb measurements, daily limb checks and any photos you choose to take. If your clinic records a treatment they have given you, that treatment. If you answer the short follow-up questions after a treatment, your answers. If you switch on a Mode (for example for a flight or hot weather), the dates and the checklist items you tick.

If you choose to tell Kella about your periods, or that you are perimenopausal or menopausal, and log related symptoms, we treat that as health information in the same way as everything else here. It is optional, only you and your clinical team can see it, and you can change or remove it at any time from your profile.

Profiles are optional and you can turn any of them off at any time from your profile; turning one off stops new entries but keeps what you already recorded unless you delete it. The symptoms you log are health information and are handled like everything else here: private to you and your clinical team, included in your data export, and removed if you delete your account. Kella records what you tell it; it does not assess, diagnose, predict ovulation or pregnancy, or replace advice from your oncology, fertility or maternity team. Where a profile shows a “when to contact your team” card, that is general guidance, not a clinical alert — Kella is not monitored around the clock.

If you have lymphoedema or lipoedema you can record limb measurements and, if you choose, photos of the affected area. Photos are optional and we ask for your consent before the first one. They are stored in a private, access-controlled area on our EU servers, are never public, and are shown only to you and, if you separately agree, to your clinical team. You can delete any photo or measurement at any time, and deleting your account removes them all. We suggest keeping your face out of photos. Measurements and photos are a record for you and your clinical team; Kella does not assess or diagnose from them.

If you switch on reminders, Kella can send notifications to your phone or browser (for example a daily check-in prompt or a nudge to drink water). This uses Google’s Firebase Cloud Messaging service to deliver the message; the notification itself never contains your scores, symptoms or results. You can turn reminders off at any time in Profile → Manage reminders.

When lab results are added to your record, Kella prepares a first draft of your plain-English report using an AI service (Anthropic’s Claude). We send only the result values, units and reference ranges, your condition profile and a summary of your recent Kella trends — never your name, email address or date of birth. The AI provider processes this under a data-processing agreement and does not use it to train its models. Nothing is shown to you until a member of your clinical team has read, edited and approved the report.

If you link a wearable, Kella compares each night’s heart-rate variability, resting heart rate and sleep with your own recent pattern to give you a Recovery score, and may notice a stretch of the day when your heart rate stays well above your usual while you are not moving, and suggest a short breathing pause. These are wellbeing guides worked out from your own device readings on our servers; they are not medical measurements, and do not diagnose illness. You can turn tense-stretch prompts off in Profile → Reminders, and disconnecting your device stops both.

Each morning, and again whenever you save a check-in, Kella compares five readings against your own last four weeks: resting heart rate, HRV, sleep, skin temperature and breathing rate where your watch sends them, and what you have told us about swelling and symptoms. It never compares you with other people. If two or more readings have moved away from your usual, Kella shows you which ones and suggests taking it easier; if the pattern could be a sign of infection, it asks you to contact your clinic. Kella stores each day’s comparison so your clinic can see why a note was shown. When Kella asks you to contact your clinic, it also sends your clinician an email with the readings that moved, so they can call you back knowing what to look at; at no other time are your readings sent by email. These comparisons are a wellbeing guide, not a medical assessment or diagnosis, and all wording is written and checked by clinicians, not generated by AI.

Kella can show age estimates. Kella Age is worked out from your watch data over the last four weeks: resting heart rate, HRV, sleep length and regularity, steps, active minutes and, where available, VO2 max, each compared with typical figures for your age and sex. Fitness age is an estimate of cardiorespiratory fitness from the same data. Where you have had blood tests through your clinic, a separate Blood age is calculated from those results and shown with its date. All three are estimates, never medical measurements, and your clinic checks the first figures before they are switched on for you. Kella Age is paused while you are recovering from surgery, in active cancer treatment, or using the Feeling unwell or Flare up modes, so that a period of illness does not count against you.

Progress photos and the shoulder check use your phone’s camera on the device itself. Photos are saved at a reduced size with location data removed and stored encrypted with the rest of your record. The shoulder check saves three angle measurements and the date, and no video is recorded or stored. You can delete any photo or shoulder result at any time.

Points are calculated from whether your wearable sent data, whether you saved a check-in, your routine, measurements and appointments attended. Rewards never use your scores, symptoms or results. Vouchers are recorded with the date issued and used. If you refer a friend, we record only that a referral voucher was issued to you, and hold no details about your friend until they create their own account.

Anything you add for a previous day is marked as added later, with the date it was entered, so your clinical team can tell it from a same-day entry. If you have not checked in for three days we may send one reminder, and after seven days one more plus an email. After that we stop messaging and your clinic may contact you directly.

If you choose to tell Kella about your day by voice, your recording is sent to Mistral AI, processed in the European Union, to turn it into text. The recording is deleted as soon as the text comes back and is never stored. Your name and contact details are not sent with it. Nothing is saved to your record until you have read what Kella heard and confirmed it. Tapping through the check-in instead is always available.

When a report is released to you, the PDF is produced by a document service (DocRaptor) under a data-processing agreement. The report content is sent to it only to generate the file and is not retained by the service afterwards.

You can ask Kella for a report of your measurements, trends, treatments and released lab results to share with your GP, consultant or another clinician. The report is prepared from your own record, approved by your clinical team, and downloaded by you. Once you share it, it is in the hands of the person you give it to; Kella does not send it anywhere on your behalf.

To understand which treatments help, we look at treatment responses across our patients in an anonymised form — for example, the share of patients who felt better 48 hours after a particular treatment. These figures contain no names, dates of birth or anything that could identify you, and they are used only to improve the care we offer and to describe our results honestly. They are never sold.

If you connect a Fitbit or Pixel Watch, Kella asks your permission, through Google, to read three things: your activity and fitness data, your health metrics such as heart rate and heart-rate variability, and your sleep data. We read only these, roughly once an hour through the day with a full catch-up each morning, to add them to your own trends, to work out your Recovery score and tense-stretch prompts against your own baseline, and, with your consent, to show them to your clinical team. Detailed readings are kept for 14 days and then only daily summaries are kept. We store them on our EU servers alongside your check-ins. We never use this data for advertising, never sell it, never share it with anyone other than you and your clinic, and no one at Kella reads it except to fix a problem you have reported or as required by law. You can disconnect at any time from Profile → Manage devices, or remove Kella's access at myaccount.google.com/permissions; once disconnected, we stop collecting new data and delete the stored Google data if you ask us to. Kella's use of information received from Google APIs follows the Google API Services User Data Policy, including its Limited Use requirements, and the Google Health API terms. Where your watch provides them, Kella also reads your resting heart rate, heart rate variability (HRV), steps, active minutes, hourly step counts, skin or wrist temperature (as a difference from your own usual, not an absolute temperature), breathing rate and VO2 max. Not every watch sends every one of these; the Me tab in the app shows what yours provides.

To show you your own picture over time, and, with your consent, to show it to the clinical team at your clinic so they can supervise and adjust your care. This is the whole purpose of Kella. We do not use your data for advertising, and we do not sell or share it with anyone else.

When you set up your profile you record your consent for your clinic's clinical team to view the wellbeing data you record. The date and time of that consent is shown on your profile. You can withdraw it at any time by emailing hello@kellahealth.co.uk; your clinic will then no longer see your data in Kella.

Your data is stored on servers in the European Union and reached only through your sign-in. We keep it for as long as you have a Kella account. If you close your account we delete your data, except where your clinic is required to retain part of it as your clinical record.

You can ask for a copy of your data, ask us to correct it, ask us to delete it, or object to how we use it. Email hello@kellahealth.co.uk and we will respond within one month. You can also complain to the Information Commissioner's Office at ico.org.uk. Kella Health Limited is registered with the Information Commissioner's Office, registration number ZC267490.

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