What's new on 11 October 2026. If you give Dayla your body weight, we use it only to size fueling suggestions. And if you run with the Dayla app on your Apple Watch, it saves your runs to Apple Health. Because these changes affect how we use your data, the app asks you to agree again.
Dayla is a running coach app made by Dolomitica Ltd, a company registered in England and Wales (number 11844886), registered office Flat 93 Biddulph Mansions, London W9 1HU, United Kingdom.
Dolomitica Ltd decides how your data is used, which makes us the "controller" under data protection law. For any question or request about your data, write to hello@dolomitica.co.uk. We reply within one month.
Heart rate, sleep, resting heart rate, your past runs from Apple Health, your physiology, and health details you tell Dayla, such as a niggle or that you are getting back from an illness, are health data. We process them only with your explicit consent, given on the "Before we start" screen.
| What | Examples | Where it comes from |
|---|---|---|
| Account | Your Apple sign-in identifier, an encrypted sign-in token, and the email Apple shares, which can be a private relay address. We don't send email to it. Before you sign in: a temporary account tied to a random ID made by the app, of which we store only a one-way code, with when it was created and last used. | Sign in with Apple; the app |
| Profile | The name you tell Dayla, your goal and the race behind it (its name, date and target time, if you give them), weekly running, the days you can run, the notes you give Dayla (which can mention a niggle), units, your time zone, your coaching preferences, a pause in your plan and its reason if you give one, and the plan changes you agree to in chat. If you choose to give them, your year of birth and your sex: we use them to estimate your heart-rate zones until your runs teach us your own, and the year of birth to check you are 16 or over. If you choose to give it, your body weight: we use it only to size fueling suggestions (grams of carbohydrate per kilo), never for weight-loss advice. | You, in setup, chat and Profile & settings; your time zone from your phone |
| Your numbers | Max heart rate, resting heart rate, best 5K and 10K, training zones and threshold, each marked as stated by you, measured or learned, with their history; how much your heart rate drifted on each run; Dayla's daily insights from your runs; and, if you bring in your past runs from Apple Health, the weekly averages of your resting heart rate over the 13 weeks before | You, your runs, and Apple Health |
| Runs | Heart rate (including from an Apple Watch, through Apple Health), pace, cadence, distance, duration, elevation, your full GPS route and the weather when you ran | Your phone during the run; the weather service |
| Past runs from Apple Health | Only if you connect Apple Health and bring in your past runs. A summary of each run your watch or apps saved to Apple Health in the last 16 weeks: the date, the time of day (morning, midday or evening), duration, distance, average and highest heart rate, climb, indoors or outdoors, whether it came from an Apple Watch or another app, and a one-way code so the same run isn't counted twice. Also your fastest run near 5K, 10K, half-marathon and marathon distance in the last 12 months (at most 4), the highest heart rate a workout recorded in that time, and weekly averages of your resting heart rate and sleep over about the last 90 days. Never your routes, splits or second-by-second data, and never the names of the apps that saved them. Your phone works out these summaries and sends them only after you sign in. | Apple Health, through the app on your phone |
| Workouts saved to Apple Health | If you run with the Dayla app on your Apple Watch, it saves the run to Apple Health as a running workout (type, heart rate, distance and energy). This stays on your devices in Apple Health; we don't receive it from there. | The Dayla app on your Apple Watch |
| Recovery and feel | Sleep and resting heart rate, if you allow access, and how you say you feel today, whether you tap it or tell Dayla in chat. They are sent with each daily card; we keep only your 7 most recent days of these daily readings. Weekly averages from your past runs are covered in the row above. | Apple Health; you |
| Getting back from illness | Only if you tell Dayla in chat that you are getting back from an illness and say yes to her offer to keep your plan easy: when you said yes, how many days you were ill and whether you mentioned a fever, as you told her, and when and why the easy period ended | You, in chat |
| Conversations | What Dayla says to you during runs, and the speech audio made from it, including greetings with your name; the summary Dayla writes after a run. From chat, Dayla keeps only what changes your coaching: plan changes and other things you agree to, how you say you feel today, and numbers you state, such as your max heart rate. Each chat thread stays on your phone. Your messages, and a one-line note of what you agreed in your other chats that day, pass through our server to the AI without being stored. | You and Dayla |
| Coaching memory | The day Dayla last checked in with you or asked how you feel; which seasonal runs she offered and your answer; the body-scan runs she offered, and whether you took them or said no; whether you want walk breaks in your easy runs | Your use of the app |
| Feedback | How a run felt, and your answers to the optional questions after a run, including anything you write, linked to that run | You |
| Consent | When you agreed, which you can only do after confirming you are 16 or older; to which version of this policy; that the app showed you the usage-signals notice; your "Usage signals" and "Help improve Dayla's coaching" choices; and the history of those choices | You |
| Usage | Unless you switch usage signals off: which screens and features you use, whether they worked, and a few settings, tied to your random account ID. Never your messages, health readings, pace or location. The "Services" section lists exactly what. | The app and our server |
| Technical logs | Errors and server events. They include a random account ID so we can trace a fault, and can include a short one-way code made from your IP address so we can block abuse, but never names, emails or towns. | Our server |
Some comparisons, such as your usual heart-rate drift or how your heart rate at an easy pace compares with your earlier runs, are worked out from your stored runs when they are needed and are not stored themselves.
We don't collect payment details: the beta is free.
We use your data to coach you, keep Dayla working, and improve it.
| Purpose | Data used | Legal basis |
|---|---|---|
| Set you up before you sign in | Account (the temporary account), what you write in setup | Providing the service you asked for, plus your explicit consent for health data |
| Coach you: today's session, coaching during runs, answers in chat | Profile, your numbers, runs, past runs from Apple Health, recovery and feel, getting back from illness, conversations, coaching memory | Providing the service you asked for, plus your explicit consent for health data |
| Start your plan from the running you already do, count your past runs toward your plan, and show you what Dayla learnt from them | Past runs from Apple Health, profile | Providing the service you asked for, plus your explicit consent for health data |
| Learn your zones and fitness over time | Runs, your numbers | Same as above |
| Keep Dayla safe and working: fix errors, prevent abuse, limit costs | Technical logs, account | Our legitimate interest in a reliable, secure service |
| Read the answers you choose to send after a run | Feedback | Your consent, given by sending them; every question is optional |
| Improve Dayla: usage signals | Usage | Our legitimate interest in understanding how Dayla is used, so we can fix what doesn't work and make it better. You can object at any time by switching "Usage signals" off in Settings; collection stops from that moment. |
| Improve Dayla's coaching: samples of your conversations with Dayla | Conversations | Your explicit consent through "Help improve Dayla's coaching", which you can withdraw any time |
| Prove you consented | Consent record | Legal obligation |
The Dayla app contains no third-party code: it talks only to our own server, Apple, dayla.co and the weather service. These services handle data only to provide their part of Dayla, under our instructions. Some are in the United States; those transfers rely on safeguards such as the EU's Standard Contractual Clauses.
| Service | What it does | What it receives | Where |
|---|---|---|---|
| Railway | Hosts our server and database | Everything listed above | Amsterdam, Netherlands (EU) |
| Anthropic | The AI that writes Dayla's coaching and chat replies; also used in our engineering tools when we diagnose problems | Your first name, what you write in setup and chat (including your notes), your run data, numbers and recovery readings, the summaries of your past runs from Apple Health if you bring them in, your body weight if you give it, and health details you share, such as being ill; never your email or location | United States |
| OpenAI | Turns Dayla's words into her voice | The words Dayla speaks, which can include your first name and your town | United States |
| Open-Meteo | Local weather for your card, your check-in and your runs | Your location rounded to about 1 km, so it can return local weather. Our server and the app on your phone both ask; the app's requests also carry your phone's IP address. Open-Meteo keeps request logs for 90 days. | Switzerland |
| Apple | Sign in with Apple; TestFlight for the beta | What Apple's own policies describe. When you delete your account, we ask Apple to revoke Dayla's sign-in. | Apple |
| PostHog | Usage analytics, unless you switch usage signals off | Usage events tied to your random account ID: which screens and features you use; whether things worked, and how quickly, in ranges (such as under 2 seconds); whether you typed or spoke a chat message; how long a run was in ranges (such as 15 to 30 minutes), and the type of session; that you paused or resumed your plan and roughly for how long, never why; which check-in questions you answered and whether you tapped or typed, never your answer; and your 1 to 5 feedback scores. Also a few settings: voice style, units, app version, sign-up week, and yes or no for notifications, Apple Health and a heart-rate strap; whether you finished setup, and which version of setup and of this policy you saw. Never your messages, heart rate or other health readings, pace, location, names, or race names, dates or target times. | EU |
| Cloudflare | Hosts the dayla.co website | Standard website request data such as your IP address and browser | Global network |
Strava (only if you connect it). When you connect Strava, each run you finish is sent to your Strava account: its route (with the first and last 200 metres removed), time, distance, heart rate and splits, plus a line saying Dayla coached it. From then on, Strava's own privacy policy applies to that copy. Dayla never reads your Strava data. You can disconnect in Settings at any time; runs already on Strava stay there.
Internal run reports are made only for our own test accounts, never for yours.
We keep your data while your account is open, so Dayla can coach you and learn your patterns.
Most of these you can do yourself in the app, at any time.
The app records simple usage signals — for example which screens you open, which features you use, and whether they worked — so we can improve Dayla. These signals are tied to a random ID, never include your messages, health readings, pace or location, and are processed in the EU. You can switch them off at any time in Settings. Separately, and only if you turn it on, 'Help improve Dayla's coaching' shares samples of your conversations with Dayla so we can improve her coaching.
The signals go through our own server to PostHog; the "Services" section lists exactly what they contain.
We have not started collecting conversation samples yet. Before we do, we will update this policy to say how they are chosen, who reviews them and how long we keep them.
We never record your screen and never use advertising identifiers. Switch either one off in Profile & settings and collection stops from that moment.
If you test Dayla through Apple's TestFlight, Apple shares with us the feedback, screenshots and crash reports you choose to send, with your device model and app version. Apple's own privacy policy covers TestFlight itself.
Feedback you send us directly as a tester, by message or in a call, is used only to improve Dayla.
Email: hello@dolomitica.co.uk
Company: Dolomitica Ltd, registered in England and Wales, number 11844886
Version 2026-10-11 · effective 11 October 2026