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 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. | 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 | You, and your runs |
| 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 |
| 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 them. | 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; your "Help improve Dayla" choice; and the history of those choices | You |
| Usage | Only while "Help improve Dayla" is on: which screens and features you use, and a few settings, tied to your account ID. The "Services" section lists exactly what. | The app, through 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, only if you agree, to 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, recovery and feel, getting back from illness, conversations, coaching memory | 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: review runs and coaching; usage analytics | Runs, conversations, feedback, usage | Your consent through "Help improve Dayla", 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, 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, only while "Help improve Dayla" is on | Usage events tied to your random account ID: which screens and features you use, how long a run was in ranges (such as 15 to 30 minutes), the type of session, whether Dayla's replies worked, 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 heart rate or other health values, names, locations, 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 |
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.
"Help improve Dayla" is off unless you switch it on. It lets us review your runs, coaching notes and app usage to make Dayla better. When it's on:
We never record your screen and never use advertising identifiers. Turn the switch 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 2026-10-09 · effective 9 October 2026