Last updated October 31, 2026

Privacy Policy

Grounds is made by Kaji Labs. If you have a privacy question, contact hi@kajilabs.ca.

What Grounds handles

Grounds handles tennis workout data: workouts, heart-rate summaries and samples, active energy, session time, and estimated forehand and backhand counts. Stroke counts are estimates and may be unavailable for unsupported player profiles or when counting cannot start.

Grounds stores your racquet hand, Watch wrist, and backhand style to select the appropriate stroke-counting model. During counted sessions, Grounds processes wrist-motion sensor data on your Apple Watch using on-device machine learning. The public app does not save or export raw motion recordings. An optional wrist-sensor troubleshooting test also processes motion on your Watch without saving samples.

Grounds processes the photos, videos, text, scores, and session metrics you choose for stories. Saved Gallery creations stay on your iPhone unless you choose to save or share them elsewhere.

Location is optional. With your permission, Grounds captures one location near the beginning of a session; it does not record a route. Grounds uses Apple MapKit and geocoding to find a nearby court, create a private map, and provide a location label. You can also add, correct, or remove a session’s location. Captured or manually selected coordinates, and location search queries you enter, may be sent to Apple’s mapping services to provide these features.

Where data goes

Grounds stores sessions on your Apple Watch and iPhone and syncs them between those devices. There is no Kaji Labs account to create or delete. Grounds does not automatically send your session data to Kaji Labs, and has no ads, analytics, or tracking. The only time Grounds sends data to Kaji Labs is when you send a bug report, described below.

Grounds requires workout access to record and save tennis workouts to Apple Health. Access to heart rate and active energy is optional. Health data is handled under Apple’s Health and Fitness privacy controls. Grounds never uses Health data for advertising or marketing, never sells it, and only sends it off your devices when you choose to include it in a story or a bug report.

You choose the content in each story and can preview it before sharing. A story may include health metrics or a court location if you include them.

When you select Instagram, Grounds hands the story to the Instagram app using a temporary clipboard item restricted to your iPhone, with an expiration of five minutes. When you select Messages, Grounds attaches the story to a message composer. More opens the system share sheet for another destination, and Download saves the story to Photos with your permission. If Instagram or Messages is unavailable, Grounds may open the system share sheet instead.

Grounds does not automatically publish or send the story; you complete sharing in the destination you choose. Apps, services, and people you choose as sharing destinations receive the story content you share. Those destinations handle their copies under their own privacy policies and controls.

Bug reports

Report a Bug in Grounds on iPhone (Settings → Report a Bug) is optional. Nothing is sent until you tap Send Report, and the screen lists what the report contains before you send it.

What a report contains: your description; your email address, only if you enter one for a reply; your Grounds app version, iPhone model, iOS version, Watch connection status, Watch app version, and tennis setup (racquet hand, Watch wrist, and backhand style); and up to five of your most recent sessions, each of which you can leave out. For each included session, the report contains its date, time, and duration, stroke counts, average and maximum heart rate, active calories, count confidence, and diagnostics about how counting ran (the model used, Watch model and watchOS version, motion-sensor coverage, and errors).

Never included: court locations and maps, your heart-rate graph or individual heart-rate readings, raw motion data, photos, stories, and the name you set on your Watch.

How it is delivered: Grounds sends the report over an encrypted connection to a relay that Kaji Labs runs on Cloudflare, which emails it to Kaji Labs support. Cloudflare processes the report and your device’s IP address only to deliver it and to limit abuse; Kaji Labs does not store your IP address. The relay does not keep a copy after delivery. If direct sending is unavailable, Grounds instead opens the iPhone Mail composer or share sheet with the same report, and you send it yourself.

How we use it: only to investigate and fix the problem you reported, which can include improving stroke counting and app reliability, and to reply to you if you gave an email address. We do not use bug reports for advertising, do not sell them, and do not share them with anyone except the service providers that deliver and store our email.

If you contact Kaji Labs by email instead, we receive the information you choose to send, including any attachments. Please avoid sending Health or location information unless it is necessary for your request.

Retention and deletion

Sessions: Grounds keeps sessions until you delete them in Your Sessions. Deleting a session removes Grounds’ session and associated map from your iPhone and sends a deletion to your Apple Watch when it reconnects.

Gallery creations: Grounds keeps saved Gallery creations until you delete them in Gallery. Deleting a session does not delete its Gallery creations. Items you save or share outside Grounds, including copies in Photos, are managed by that destination and must be deleted there separately.

Health workouts: Deleting a session in Grounds does not delete its Health workout. Manage or delete Health workouts in the Health app.

Development-only recordings: Separate contributor builds may offer consented contributors diagnostic-recording and raw-motion collection tools. These tools are not included in the public app. Recordings remain on the contributor’s devices unless the contributor exports or shares them as part of the agreed collection process.

Bug reports and support email: We delete bug reports and support emails when we resolve the issue or one month after we receive them, whichever comes first. You can ask us to delete a report or email you sent at any time by writing to hi@kajilabs.ca.

Backups: Grounds does not sync its session or Gallery storage to iCloud and excludes its app-owned session, Gallery, and recording files from device and iCloud backups. Copies you choose to save to Apple Health, Photos, Files, or another destination are managed separately and may sync or be backed up according to that destination’s settings. Manage or remove those copies through the destination and its backup controls.

Your choices

You can deny or later change permissions in your Apple device settings. Workout access is required for recording; heart-rate, active-energy, and location access are optional. Photos access is requested when you choose to save a story to Photos. Denying or revoking access can limit the related feature.

You can remove a session’s location, delete Grounds sessions, and delete Gallery creations separately. You control which content appears in a story and where you share it.

Sending a bug report is optional. You can leave out any session and leave the email field blank. You can ask to see, correct, or delete anything you have sent Kaji Labs by writing to hi@kajilabs.ca.

Changes and contact

We may update this policy when Grounds changes. The current version is posted here.

Questions: hi@kajilabs.ca.