Last updated 13 November 2026
Mioly is a training log for figure skaters: an iPhone app and the website mioly.io. This page says what Mioly keeps about you, where, why, and what you can do about it.
Mioly is made and run by Cong Liu, a private person in Denmark, who is responsible for your data (the data controller). Questions, requests and complaints: support@mioly.io.
Mioly does not collect your location, contacts or anything about how you use the app, and it shows no advertising.
Done on your iPhone: following the skater in a video, finding the elements and fun moments, making Studio videos, frame sequences, and Studio's suggestions (with Apple's on-device AI, where the iPhone has it) all happen on the iPhone itself. Your videos are not sent anywhere to be analysed. Which of these features you have, and how well they work, depends on your iPhone's model: on older models some may be slower, less accurate or not available.
Only to run Mioly for you: to keep your log and media, to keep them the same on each iPhone you log in on, and to send you the emails you expect, such as an invitation. Mioly does not sell your data, does not track you across apps or websites, and does not share your log with anyone. Your profile and log are visible only to you. Nothing is shown to anyone else unless you choose to share it (see Sharing with a coach), and Mioly shows you exactly what will be shared before it is. Mioly looks at your content only where the law requires it, or to deal with a report that it breaks the terms of use; where content may involve the sexual abuse of a child or a risk to someone's safety, it is reported to the police.
The legal basis (under the EU's GDPR) is mainly the agreement with you: Mioly needs this data to give you the service you signed up for. Keeping the daily backup and dealing with reports of misuse rest on Mioly's legitimate interest in keeping your data safe and the service lawful; reporting to the police, and keeping accounting records of payments, are legal obligations.
You can share up to five attempts with a coach, or anyone else you ask for advice, by a link made in the app. It is your choice each time, and before the first link the app explains what sharing means and asks you to agree. The link shows, on mioly.io, those attempts, the elements they are labelled with, their dates and notes, your question, and the skater's name from the profile; nothing else from your log. Anyone who has the link can open it for 30 days, or until you end it in the app sooner, so send it only to the person you ask.
An attempt labelled in a longer video is copied out of it by Mioly's server, in the cloud: only its seconds, without the video's location or other details. The copies are stored temporarily in Mioly's cloud storage, hidden from anyone but you and the people you send the link to, and deleted when the link ends; the rest of the video is never in the link. An element video is shown as it is. To show the videos in the browser, Mioly's server passes them through from the storage; they are not analysed or used for anything else, and the storage's own addresses never leave the server. The coach needs no account. The coach gives a name and writes comments; both are kept with the activity in your account, shown to you in the app, and you can delete any comment. When a comment arrives, Mioly emails you to say so (not the comment itself), at most once an hour per link. Mioly counts how many times a link was opened and when it was last opened, but not who opened it or from where. The server keeps the link only as a hash, so no one can read the links from Mioly's storage.
When a link ends, the page stops working at once and the copies are deleted. The record of the share (which attempts, your question) and the comments stay in your account, so you can look back at them with the attempts from your own videos; they are small, and kept until you delete a comment or your account. Share only videos you may share: if other people are in them, they, or their parents when they are children, must be fine with it. For a skater under 13, the parent or guardian who looks after the account decides. The legal basis is the agreement with you: sharing is a part of the service you ask for when you make a link.
These companies only process the data to provide their service to Mioly. Render, Cloudflare and Resend are companies based in the United States: your log and media are stored in the European Union, but the companies, and Resend's email sending, may handle data from the United States. Such transfers are protected by the safeguards EU law requires, such as the EU–US Data Privacy Framework or the European Commission's standard contractual clauses.
Mioly uses the camera and microphone only while you record practice. Your photo library is used when you choose photos or videos to add, when you allow recordings and clips to be saved to Photos, and in Studio, if you allow it: Studio then shows your photos and videos by day so you can choose some for a video. What Studio shows from your library stays on your iPhone; only what you add to your log is uploaded. Access can be changed at any time in the iPhone's Settings → Apps → Mioly.
Many skaters are children. For a skater under 13, a parent or guardian must create the account and look after it.
Your data is kept while your account exists. Anything you delete in the app is removed from the cloud the next time it syncs. If Mioly Plus ends and your videos take more than the free 500 MB, they are kept for two years from the day it ended; after that the oldest videos are removed until the storage is under 500 MB, with notices by email 30 and 7 days in advance. Your training log itself is not removed. When you delete your account in the app, your account, log and media are removed from Mioly's cloud storage and server straight away; anything left in Mioly's daily backup of the account list and in the services' logs is gone within 30 days.
Apple runs Mioly Plus, so deleting your account can't stop it: cancel Mioly Plus first, in your iPhone's Settings → your name → Subscriptions. If your account is already deleted, you can still cancel it there, as the subscription belongs to your Apple Account.
If this policy changes, the new version is posted here with its date. If a change affects how your data is used or shared, Mioly tells you by email or in the app before it takes effect.