Privacy Policy
Strobe has no accounts, no servers and no analytics. Your swings are recorded, stored and analysed on your iPhone. Nothing is uploaded unless you deliberately send it.
Last updated August 26, 2026
The short version
- Video, pose data, metrics and drawings live on your device. Nothing leaves it unless you ask for a coaching review, and the video leaves only if you additionally switch on Send the clip to the coach.
- There is no Strobe account, no Strobe server and no backend to store anything.
- No analytics, no crash reporting SDKs, no advertising, no tracking of any kind.
- AI coaching is optional and off by default. When you turn it on, the app sends swing metrics and a few still key frames to the AI provider you chose, under your API key. The video is not sent — unless you switch on Send the clip to the coach, which is also off by default and offered only for Google’s models, the only ones that read video.
- Your API key is stored in the iOS Keychain on that one device and never synced.
What Strobe stores on your device
Recorded and imported swing videos, the analysis produced from them (tracked body positions, detected swing phases, metrics), any lines and angles you draw, your session names and club selections, your app settings, and any coaching results you saved. All of it is kept in the app’s own storage on your iPhone. Deleting the app deletes all of it.
What Strobe collects about you
There is no analytics SDK, no telemetry, no crash reporter, no advertising identifier, no fingerprinting and no third-party tracking in the app. Nobody, including the developer, can see your swings, your library or the fact that you opened the app.
One feature is the exception, and only when you use it. If you buy Strobe Pro and ask for a coaching review, that one request goes to Strobe’s coach server, which checks your purchase and passes the request to an AI model. What that server keeps afterwards is a count: the App Store transaction identifier for your purchase and how many reviews it has used this month, so the monthly allowance can be enforced. It expires after about ten weeks. The swing you sent is not stored, and the identifier is not tied to your name, your email or any account with the developer, because the app never asks you for one.
If you download the app from the App Store, Apple provides the developer with its own aggregate, anonymised sales and crash reporting. That comes from Apple and is governed by Apple’s privacy policy, not by anything in this app.
What the App Store privacy label says
The App Store listing for Strobe discloses three data types — Photos or Videos, Fitness and Purchases — all collected for App Functionality, not linked to your identity and not used for tracking.
Photos or Videos and Fitness refer to one thing: the still key frames and swing metrics that a coaching review sends, described below. Purchases refers to the App Store transaction that proves you own Strobe Pro, which the coach server checks and counts against your monthly allowance. If you never ask for a review, none of the three is ever sent. Nothing else in the app is disclosed, and nothing is marked as tracking.
Camera, microphone and photo library
The camera is used to record swings, and only while the record screen is open. The microphone is used only if you turn audio recording on. Photo library access is used to import clips you pick and, if you export, to save a clip back. Media captured or imported this way is written to the app’s own storage; it is not sent anywhere.
Optional AI coaching
Coaching is off until you choose one of two ways to have it, and every other feature works without either.
With Strobe Pro. The request goes to Strobe’s coach server over HTTPS, carrying the signed App Store transaction that proves the purchase. The server verifies it against Apple’s published keys, forwards the swing to an AI model, and streams the answer back. It keeps no swing data. The model is chosen by the server and named on the review when it arrives.
Or with an account of your own. Add an API key for an account you already hold with Anthropic, OpenAI or Google, and the app calls that provider directly from your iPhone using your key, with no Strobe server in between. Your usage is billed by that provider to your account. A connected key runs only when you pick it in Settings, so buying Strobe Pro never quietly spends your own credit.
What is sent
- The metrics and swing-phase data the on-device analysis produced for that one swing (tempo, angles, estimated speeds, frame indices, club type and camera view).
- Four to six still key frames from that swing, resized, as images — for example address, top and impact.
- The coaching instructions the app builds around them.
If you switch on “Send the clip to the coach”
This setting is off on every install, and it appears only when your coach is running on a Google account — Google’s models are the only ones of the three that read video, and Strobe Pro’s coach can as well. With it on, one thing changes: instead of the still frames, the request carries a trimmed copy of that swing — from just before address to just after the finish, re-encoded small, with no audio track. It goes the same way the rest of the request goes and nowhere else, and it is not stored by the coach server. Everything on the list below is still never sent.
What is never sent
- The swing video itself, in whole or in part, at any frame rate — unless you have switched on Send the clip to the coach, above.
- Your other swings, sessions, drawings or library contents.
- Your name, email address, device identifiers or location — the app has none of these to send. On the Strobe Pro route the request carries your App Store transaction, which proves the purchase and identifies nothing else about you.
Either way an AI provider receives that request, and their own terms and privacy policy govern what they do with it, including how long they retain it and whether it may be reviewed. On your own account those are your account’s settings to read; on Strobe Pro the provider is whichever model Strobe has on duty, named on each review. The app asks providers not to store the request where that option exists. If you would rather send nothing at all, leave coaching off — every other feature works without it.
Your API key
Your key is stored in the iOS Keychain with device-only accessibility: it does not sync to iCloud, does not appear in backups that leave the device, and is never transmitted anywhere other than to the provider it belongs to, as the authentication header on your own requests. You can delete it in the app at any time, which immediately turns coaching off.
Sharing and export
When you export an annotated clip or a whole session, iOS hands the file to whatever destination you pick in the share sheet — Messages, Photos, a file, another app. Where that file goes and who can see it after that is up to you and to that destination. Strobe is not involved once you have shared it.
Children
Strobe is not directed at children and collects no personal information from anyone, including children.
Changes to this policy
If the app’s handling of data changes, this page changes with it and the date at the top is updated. Material changes will also be described in the App Store release notes for the version that introduces them.
Contact
Questions about this policy, or about anything the app does with your data: stathis.alexander@gmail.com.