Privacy Notice
Version 2026-10-26
HyzerFlip watches you throw and tells you what to fix. This page says
exactly what it keeps to do that, and what you can make it forget.
What we hold
Your username, email address and password, the Setup choices that follow you to another phone (your level, your throwing hand, what the coach keeps quiet about, and your other Setup switches), and how you found HyzerFlip: your answer if you gave one when you signed up, and the name of our link you followed, if you followed one.
Why: To let you sign in on any phone, to bring your Setup with you, to reach you about your plan, and to learn which of our videos and posts bring players in.
Our reason for holding it: Needed to give you the account you asked for.
How long: Until you delete your account.
The stick-figure positions of your body through each throw, and the coaching the app worked out from them.
Why: This IS the coaching. Your progress, your streak and every comparison against an earlier session are built on it.
Our reason for holding it: Needed to give you the coaching you asked for.
How long: Until you delete your account.
The video your camera recorded of a throw.
Why: So the Throws tab can play your throw back and coach you through it.
Our reason for holding it: Needed for the throw log, which is part of Pro.
How long — Free: Your video is deleted as soon as the throw is coached.
How long — Pro: Your newest 10 throws keep their video. Older ones are deleted automatically, and everything goes when you delete your account.
How long — When Pro ends: Once Pro or the free week has ended, you have 2 days to save the videos of your newest 10 throws; then they are deleted. Your coaching and your numbers are kept for good.
A copy of each throw's stick-figure positions under a random code instead of your name.
Why: To improve the coaching for everyone — spotting what most players get wrong.
Our reason for holding it: You agree to this when you sign up, and you can switch it off in Setup at any time.
How long: Until you delete your account.
YOU CAN SWITCH THIS OFFA random code your browser keeps in a cookie while you are not signed in, and a second cookie saying an account has been used on this phone.
Why: To count your free coached throws, so the throws you made without an account can be read back by you and nobody else, and so a stranger's throws on a phone you signed out of never join your account.
Our reason for holding it: Needed to give you the free throws you asked for.
How long: The cookie expires 400 days after it is set. Throws coached without an account are kept until newer signed-out sessions push them out: the newest 500 are kept.
When the app notices it has broken on your phone: a log of what it was doing, your browser's name and which session it was. Never video.
Why: So a fault that stops the coaching is found and fixed even when nobody reports it.
Our reason for holding it: Our legitimate interest in keeping the app working.
How long: Only the newest 20 reports are kept, and none longer than 30 days.
If you have an early-adopter seat: copies of your throw videos, kept on the computer of the people who run HyzerFlip. Only they see them, and Claude, the coding assistant from Anthropic that they build HyzerFlip with, when it tests a change.
Why: To test changes to the coach on real throws before they reach you, and to find what it gets wrong.
Our reason for holding it: Part of the early-adopter seat, and optional: switch it off in Setup at any time and your seat stays Pro for good.
How long: While early access lasts. It ends on the day card payment is switched on, and we will email you before then. Your seat stays Pro for good; only the copying stops. When it ends, when you switch it off, or when you delete your account, our copies are deleted within 30 days.
YOU CAN SWITCH THIS OFFWhat you do in the app, as short records: signing up and in, which button on our site brought you, whether the camera opened, each throw coached or not and how long it took, drills finished, throws watched back, asking why, how fast pages load, and payments. Never video, never the stick figure.
Why: To see which parts of the app help players and which ones fail them, and to keep it fast.
Our reason for holding it: Our legitimate interest in knowing whether the app works for the people using it.
How long: 13 months, then deleted; at once with your account.
What you write to us with Send feedback, and the phone it came from: its model and system, your browser's name and version or the app's, its screen size, the camera's frame rate, the screen you were on, and the throw or session you sent it about, if you picked one.
Why: To fix what you tell us is wrong, and to answer you. Each one is also emailed to us, so we can reply to your email address.
Our reason for holding it: You send it to us.
How long: Until you delete your account. The email copy is kept like any email you send us, and deleted if you ask.
The trees you place on or remove from a course in Play, where and when, with your account's name on each change.
Why: So the courses in Play look like the real ones for everyone, and so a change made in bad faith can be taken back.
Our reason for holding it: You make them for everyone who plays the course.
How long: Until you delete your account. Your changes then come off the course.
If you ask for a Founder seat on our site: the email address you give, your first name if you add it, when you asked, which of our links brought you, and which version of our front page you saw.
Why: To answer you, and to send you the seat if we give you one. Each request is also emailed to us, so we can reply to you.
Our reason for holding it: You ask us for it.
How long: Until we answer it. A seat we give puts your address on our early-adopter list, where it stays with your seat; a request we turn down is deleted once we have emailed you our answer. The email copy is kept like any email you send us, and deleted if you ask.
A count of how many times each page was opened each day, and which of our links led there. Nothing that says who you are: no cookie, no address, just the count.
Why: To learn which of our videos and posts bring players in.
Our reason for holding it: Our legitimate interest in knowing what our own links do.
How long: The counts are kept for good; they hold nothing about you.
Your plan, and — once you pay by card — the customer number Stripe gives us.
Why: To know which plan you have. Card numbers are typed on Stripe's own page and never reach this app.
Our reason for holding it: Needed to give you the plan you have.
How long: Until you delete your account.
Who else sees it
Nobody sells it and nobody buys it. Two companies touch it because the app runs on them: our hosting provider stores the files and runs the tracking that coaches you, and Brevo sends the emails you ask for — a password reset or a link to confirm your address — so it sees that address, and carries the feedback you send us to our inbox.
The tracking that coaches you runs on our server. The pose engine in your
browser works on the phone: it reads your hand signals, helps you stand in the
picture, checks that you are moving and notices a throw, so the phone knows
which moment to send. It is served from this app, not from anyone else's
network.
Your throw video and your throw log are yours. No other player's account
can open them, and requests for one you do not own are refused. The people
who run HyzerFlip can open any throw, to find and fix what the coach gets
wrong.
What you can make us do
- See what we hold about you — Setup > Your data > Download my data, or ask us. Your account, every session, the coaching on every throw and every comment, as one file. Your throw videos are not inside it: the file lists them by name. Save a video from the Throws tab with Save video.
- Correct something that is wrong — Ask us.
- Delete your account and everything in it — Setup > Your data > Delete my account. It is immediate and final.
- Take your data elsewhere — The download is machine-readable JSON.
- Stop an optional use — Setup > Your data: one switch for each.
- Complain to a regulator — Your national data protection authority; in Denmark, Datatilsynet.
Deleting your account is immediate and irreversible: the throws, the videos,
the coaching history and the copy used to improve the app all go in the same
action. There is no recovery afterwards.
Children
HyzerFlip is for people aged 16 or over, or younger with a parent's permission. If you are younger than that, ask a parent
to set the account up with you.
Who to ask, and who is answerable
Write to
agileupgrade@gmail.com. We answer within
30 days. If you are not happy with the answer you can
complain to your national data protection authority.
Agile Upgrade ApS, Michael Anchers Vej 25, 8270 Højbjerg, Denmark
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