Last updated: 21 September 2026
Effective: 21 September 2026
TossBuddy is a tennis practice app. Here is what matters most, before the detail:
The rest of this document explains the whole picture.
TossBuddy is made by Sky Kim, who is the controller of the information described here.
You can delete your account at any time from Profile inside the app. If you have a question about your privacy, or you want your information corrected, email tossbuddy.dev@gmail.com.
This section is deliberately specific, because it is the part people are most often surprised by.
Visible to other signed-in players: your username, your country, your state if you are in the United States, and, on the leaderboard for each serve mode, your perfect percentage, your total tosses and your streak. Your profile record also carries which sign-in method you used and when your account was created. Your friends additionally see your friend activity.
Not visible to anyone but you: your email address, your videos, the detailed measurements the app calculates from each toss, your session history, your goals and daily missions, and your purchases.
Your country and state are stored on your profile record, and that record can be read by any signed-in TossBuddy account. This is how the app looks up usernames and builds regional leaderboards. If you would rather not share a region, email us and we will clear it.
When you record a session, the video is written into the app’s own storage on your device. It is not uploaded anywhere. There is no server component that can receive it.
Recordings are kept separately for each account. If more than one person signs in on the same phone, each of you sees only your own recordings. You cannot see, play or share someone else’s.
You can share a recording yourself, from the video list in the app, using the standard iPhone share sheet. At that point the video goes wherever you send it, and what happens to it is governed by whichever app or service you chose.
Your recordings are removed when you delete the app, and also when you delete your account. Because we never had a copy, we cannot recover one for you. If you want to keep a recording, save it to your Photos or share it somewhere else before you delete your account.
The camera is used to watch your toss. Frames are analysed on your device, in real time, using Apple’s own on-device vision and machine learning frameworks. Those frames are not transmitted and not stored unless you are recording, in which case they go into the video described above.
TossBuddy can record in two ways, and they treat sound differently:
Either way, the microphone is used only while a recording is actually running.
If you use TossBuddy with a paired Apple Watch, the phone and the watch talk to each other directly, over Apple’s own device-to-device connection.
When the app detects that you have struck a serve, it prompts your watch. You tap where the serve landed, and the watch sends that back to your phone. What travels between the two devices is the court side, the area of the service box, and an identifier linking it to that serve. No video, no camera frames and no personal details are sent to or from the watch.
Those serve outcomes then become part of your practice records, described above, and are stored the same way. If you do not use a watch, nothing in this section applies to you and the app never mentions one.
Purchases are processed by Apple through the App Store. We never receive your card number, your billing address, or any payment detail.
After a purchase, Apple sends our server a digitally signed confirmation. From it we record only what you are entitled to: which product you bought, and for a subscription, when it expires. Apple also tells our server when a subscription renews, lapses, is refunded or is cancelled, so that what the app gives you stays correct.
We use a small number of service providers, and they only receive what they need to do their job:
We do not sell your personal information. We do not share it with advertising networks, and we do not use it for cross-app or cross-site tracking. We will only disclose it otherwise if we are legally required to.
Our database and functions run on Google’s infrastructure, and PostHog processes analytics on its own. Your information may be stored and processed in the United States and in other countries where these providers operate. If you are in the United Kingdom, the European Economic Area or Switzerland, this means your information may be transferred outside your home country. Where that happens, we rely on the safeguards our providers put in place for international transfers, including the European Commission’s standard contractual clauses.
If you are in the United Kingdom or the European Economic Area, the law asks us to name a legal basis for each use:
We keep your account and its associated records for as long as your account exists.
You can delete your account yourself, at any time, from Profile inside the app. Deleting it removes your practice, social and purchase records from our database, removes you from other players’ friend lists, and deletes the recordings held on your phone.
Some information outlives the deletion for a short and limited time:
Anything held only on your phone, including your video recordings, is also removed if you delete the app.
Your information is held in Google’s infrastructure and protected by access rules that let each account write only its own records. Reading is restricted the same way, except for the profile and leaderboard information described under What other players can see, which any signed-in account can read. Traffic between the app and our database is encrypted in transit. No system is perfectly secure, and we cannot promise that one never will be breached, but we do not keep the two things that would matter most if one were: we hold no payment details and no video.
Depending on where you live you may have further rights, including the right to a copy of your information, the right to have it corrected or erased, the right to object to or restrict how it is used, the right to have it sent to another service, and the right to complain to your data protection authority. Email us and we will honour those rights. We will not treat you differently for exercising them.
If you live in California, you have the right to know what personal information we collect and why, the right to have it deleted, the right to correct it, and the right to opt out of its sale or sharing. We do not sell or share personal information as those terms are defined in California law, and we do not use or disclose sensitive personal information for any purpose that would give you a right to limit it. You may exercise your rights by emailing us, and you may use an authorised agent to do so.
TossBuddy is not directed at children under 13, and we do not knowingly collect personal information from them. We do not ask for your age or date of birth. If you believe a child has given us personal information, email tossbuddy.dev@gmail.com and we will delete it.
The services named above have their own policies, which govern what they do with information once it reaches them:
If this policy changes in a way that matters, we will update the date at the top of this page and, where the change is significant, tell you in the app.
Sky Kim tossbuddy.dev@gmail.com