Privacy
Honest Jump · last updated 9 October 2026 · in effect from 2 October 2026
Honest Jump measures a countermovement jump from the motion sensors of the phone held against your chest. This page lists what it stores and why, who sees it, who handles it for us, how long it is kept, and how to have it deleted.
Who is responsible
Honest Jump is run by 어니스트무브 (Honest Move), a sole proprietorship owned by 김훈 (Hoon Kim) and registered in the Republic of Korea. Honest Move decides what is collected and why, and answers for it.
- Business registration number: 156-15-02246
- Address: RGB Campus, Shared Office, 22, Soonchunhyang-ro, Sinchang-myeon, Asan-si, Chungcheongnam-do, Republic of Korea, 31538 (충청남도 아산시 신창면 순천향로 22 RGB Campus 공유오피스)
- Privacy officer: 김훈 (Hoon Kim), owner. Reach the officer at the email address or phone number below.
- Email: contact@honestjump.com
- Phone: +82 10-2128-8615
What is stored, and why
- Your account. Signing in with Google gives the app your email address, your name and profile picture link as set in Google, and Google's id for your account. Never your password. For each device you are signed in on, the sign-in service also keeps the time, IP address and browser, until you sign out or delete the account. It also keeps a sign-in record of each sign-in, sign-out and session refresh: the time, your email address, your IP address and what happened. This is how you sign in, how one account is kept apart from another, and how misuse of an account can be looked into.
- Your profile. Name, affiliation, role, date of birth, country. All five are required. Name, affiliation and role tell us who is using the app during the beta. Your date of birth confirms you are 14 or over. Your country tells us where the app is used. The app also stores your phone's time zone, and updates it when it changes, so that the daily analysis limit resets at your midnight.
- Your team. Its name, which starts as your name, its plan, and when an athlete was last deleted. The plan sets your limits.
- The athletes you register. Name, affiliation, country, height, weight, date of birth. All six are required. They are shown on the athlete's page, next to their jumps. The app also stores when you confirmed that the athlete agreed (see Athletes).
- Measurements. For each jump you save: the time, every result in the report (jump height, mRSI, peak force, take-off velocity, flight time, depth, phase times, power, work), the phase markers, and the force, velocity and power curves. They make the report and the trends on the dashboard.
- Failed jumps. When the app cannot find the flight in a jump, it keeps that jump's motion sensor recording and a note of why. Recordings of other jumps are not kept. This happens on its own right after the analysis, whether or not you press save. The recordings are used to make flight detection better.
- Analyses. The time of each analysis, and whether it was given back because no height came out, so the app can count how many you have left today.
What is not stored
- Raw sensor readings. The motion samples go to the analysis server and come back as one result. Apart from the failed jumps above, they are not saved.
- Location, camera, microphone, contacts. None of it. The app asks the phone for motion and orientation, and only during a measurement. The only body data is what is listed above: an athlete's height and weight and the results of their jumps.
- Nothing is sold.
Why we may use it
- Your account, profile, time zone, measurements and analysis times are needed to provide the service you sign up for (Personal Information Protection Act, Article 15(1)4).
- The usage counts and the failed-jump recordings serve Honest Move's legitimate interest in seeing how the beta is used and in making detection better (Article 15(1)6). They hold only what is described on this page.
- The sign-in records serve Honest Move's legitimate interest in keeping accounts safe and looking into misuse (Article 15(1)6).
- An athlete's details rest on the agreement of the athlete, or of a parent or guardian if they are under 14 (Articles 15(1)1 and 22-2). See Athletes.
- Sending data to the companies abroad listed under Who handles it for us is needed to provide the service, and is set out on this page as Article 28-8(1)3 requires.
Athletes
An athlete you register has no account and may never see this page. Honest Move asks you, the coach, to tell them what is stored and to get their agreement before you register them. If they are under 14, the agreement must come from a parent or guardian, as Korean law requires. The app will not save a new athlete until you confirm this, and it keeps the time you confirmed.
An athlete, or their parent or guardian, can ask us directly to see, correct or delete what is stored about them, or to withdraw their agreement, using the contact details above. If the agreement is withdrawn, we delete the athlete and their jumps.
Accounts are for people aged 14 and over. The app does not let anyone younger finish signing up, and they can delete the account straight away from the same screen. If they leave without deleting it, the account keeps only what Google gave at sign-in and the days the app was opened.
Who sees it
- Your team. Athletes and their jumps belong to your team, and every member of a team can see and change them. Today each team has one member: you.
- Honest Move. The people at Honest Move who run the beta see, for every account: its name, affiliation and role, when it joined, on how many days the app was opened, how many jumps it analysed and saved, and when it was last used. That view shows no athletes and no measurements. Honest Move can also open the database directly, to keep the app running and to fix problems.
- Nobody else. Your data is not given to anyone outside Honest Move, except to the companies below that run parts of the app for us, or where a law requires it.
Counting use
The app records when it is opened, when a jump is analysed, when an analysis fails, and when a jump is saved. During the beta the people at Honest Move running it read these counts, as described under Who sees it.
Each record holds which of these happened, when, and which account. Nothing about the jump: no height, no force, no curves, no athlete. The records stay in the same database as everything else, and deleting your account deletes them.
Visits
Page visits are counted by Vercel, which hosts this site. This is the only count that includes people who are not signed in.
No cookies, and no visit is tied to your account. The address is cleaned first, so an athlete's id never reaches Vercel. Vercel receives that cleaned address plus what any web server sees: your IP address, your browser, and the page you came from.
Your browser
Honest Jump sets no cookies. It keeps a few things in your browser's own storage: your sign-in, so you stay signed in; your language; whether this tab has shown the intro; and a measured jump waiting to be saved while you sign in again, until it is saved or the tab is closed. Clearing this site's data in your browser removes them.
Who handles it for us
Honest Move has these companies run parts of Honest Jump on its behalf. Each gets only what its part needs, at the moment the app needs it, over an encrypted connection. All three are American companies, so using Honest Jump transfers your data abroad as described here.
- Supabase, Inc. Runs the database and the sign-in service. It holds everything listed under What is stored, on servers in Seoul, Republic of Korea. Supabase's staff may reach it from abroad to keep the service running. Kept until deleted as described under How long it is kept. Contact: privacy@supabase.com.
- Render Services, Inc. Runs the analysis server, in Singapore. When the app opens, and again before a measurement, it sends the server a short request that wakes it up. For each analysis it sends that jump's motion samples and your sign-in token. The token carries your email address, your Google name, your profile picture link, Google's id for your account and your Honest Jump account id. The server passes it to Supabase to check and record your daily count. The server works out the result and keeps nothing except a log of each request (IP address, browser, time, result), which Render deletes after 7 days. Contact: privacy@render.com.
- Vercel Inc. Hosts this site, in the United States, and serves each page from its server nearest to you. It counts visits as described under Visits. Visit counts are shown to us for one month; Vercel may keep them longer under its own policy. Contact: privacy@vercel.com.
These transfers are how the app works, so they cannot be turned off one at a time. To refuse them, do not sign in, or delete your account. Without an account you cannot analyse or save a jump, and only the three requests under Without an account are sent.
Signing in with Google
You sign in with your own Google account, so Google LLC, in the United States, learns that you signed in to Honest Jump. Google handles that under its own privacy policy, not on our behalf.
Without an account
Nothing you type or measure leaves your phone. Opening the app still sends three requests that are tied to no account: the page and visit to Vercel, a request to Supabase for the plan limits, and the request that wakes the analysis server at Render. Each carries your IP address and browser. Vercel also gets the cleaned page address and the page you came from.
How long it is kept
- Your account, profile, time zone, analysis times and usage counts: until your account is deleted.
- Athletes and their measurements: until you delete the athlete or your account.
- Failed-jump recordings: until the athlete they belong to is deleted. Recordings made before 2 October 2026 are not linked to an athlete and stay until your account is deleted.
- Signed-in devices (time, IP address, browser): until you sign out on that device or delete your account.
- Sign-in records (time, email address, IP address, what happened): 3 months, then deleted automatically. They stay for those 3 months even after the account is deleted, so that misuse can still be looked into.
- Request logs at Supabase: 1 day.
- Request log at Render: 7 days.
- Visit counts at Vercel: as described under Who handles it for us.
No law requires us to keep any of it longer. Our database plan keeps no backups, so a deletion is final at once. If that changes, this page will say how long backups are kept.
Delete
Swipe an athlete left and confirm to delete them and every jump recorded for them. To delete your account, open your profile and press Delete account. That removes the account, the athletes under it, every measurement, the failed-jump recordings, the analysis times and the usage counts. They are deleted from the database and cannot be restored. Only the sign-in records and the logs listed under How long it is kept outlast it, until they expire.
If you cannot reach the button, write to us and we will delete the account within 10 days.
Your rights
You can ask to see what is stored about you, get a copy of it, have it corrected, have its use stopped, or have it deleted. Write to the email address above. We answer within 10 days, and it costs nothing. You can also do this through a parent or guardian, or through someone you authorise in writing. Your profile and your athletes can also be edited in the app.
If you think your data has been mishandled, you can also go to:
How it is protected
- Every athlete and jump in the database belongs to one team, and a rule in the database lets only members of that team read or change it. Your profile can be read only by your own account. Your usage counts cannot be read by any account. Honest Move sees both through the view described above.
- Everything travels over HTTPS, and the database is encrypted at rest.
- There are no passwords to leak. Signing in goes through Google.
- Only Honest Move can open the database directly. Supabase staff may reach it to keep the service running.
This is a beta
Measurements may be lost while the app changes. Results are for training and research. This is not a medical device and does not diagnose anything.
Changes
When this page changes, the dates at the top change with it. If a change means collecting something new, or using it for something new, it is posted here at least 7 days before it takes effect.
Earlier versions: 10 September 2026.
Contact
contact@honestjump.com · +82 10-2128-8615