Privacy policy.
Crossband’s apps work over Bluetooth, between your own devices. We don’t run a server that sees your data.
Last updated 6 October 2026.
In short
| Data | Where it goes | Do we get it? |
|---|---|---|
| Notifications, calls, music info | iPhone to watch, over Bluetooth | No |
| Health data | Watch to Apple Health on your iPhone, over Bluetooth | No |
| Diagnostic log | Stays on your device unless you export and send it | Only if you send it |
| Purchases | App Store or Google Play | No payment details |
| Waitlist email | Our waitlist database, hosted by Cloudflare | Yes |
| Support email | Our inbox | Yes |
Who we are
Crossband is made by Boundform Labs Ltd (registered in England and Wales, company number 17492264), All Saints Business Centre, All Saints Street, Bolton, BL1 2EJ, United Kingdom (“we”). We are the controller of the personal data described here. Contact us about privacy at support@crossband.app.
The apps: Wear OS watch with iPhone
Crossband has a watch app and an iPhone app. They talk to each other directly over Bluetooth. There is no Crossband account and no Crossband server, so nothing below is sent to us unless you choose to send it.
Notifications, calls and media
After you pair your watch with your iPhone, iOS sends your notifications, incoming call details and now-playing information to the watch over Bluetooth, using services built into iOS. The watch app shows them and sends back your actions, such as dismissing a notification, answering or declining a call, or pausing music. This data stays on your watch and iPhone.
Health data
If you turn on health sync, the watch app reads heart rate, steps, distance and workouts from your watch, with the permissions you grant on the watch. It sends them over Bluetooth to the iPhone app, which saves them to Apple Health with the permissions you grant in iOS. Records wait on the watch until the iPhone confirms it has saved them, then the watch deletes its copy.
- We never receive your health data.
- We don’t use it for advertising or sell it, and we don’t share it with anyone.
- You can stop health sync at any time in the app, and change or remove permissions in the Health app on iOS and in your watch’s settings. Data already saved to Apple Health stays there until you delete it.
Diagnostic logs
The diagnostic log is off unless you turn it on. When it is on, the apps record how the Bluetooth link behaves: connection events, timings, sequence numbers, message sizes, the app ID and category of each notification, and your device models and software versions. It never records notification text, message content, contact details or health values.
The log stays on your device. It only reaches us if you export it and send it to us, for example by email with a bug report. We use it only to fix the problem and delete it within six months.
Purchases
Crossband is bought through the App Store or Google Play. The store takes the payment under its own privacy policy. We don’t see your card details. The apps ask the store whether you have bought Crossband. The iPhone app also asks the App Store when your free trial started, and tells your watch.
Permissions
| Device | Permission | Why |
|---|---|---|
| iPhone | Bluetooth | To talk to your watch |
| iPhone | Health (write) | To save your watch’s health data to Apple Health |
| Watch | Nearby devices (Bluetooth) | To connect to your iPhone |
| Watch | Notifications | To show your iPhone’s notifications and calls |
| Watch | Body sensors, physical activity | To read health data for health sync |
Apple Watch with Android
A later version will connect an Apple Watch to an Android phone. That needs a relay service to pass notifications between the phones. We will update this policy to explain what that service handles before it launches.
The website
This website is hosted on Cloudflare Workers. Like any web host, Cloudflare processes your IP address and request details to deliver the site and protect it from attacks. We don’t use analytics, advertising or tracking cookies, and we don’t load third-party trackers.
Waitlist
If you join the waitlist we store:
- your email address,
- which pairing you’re interested in, and
- the date you signed up.
We use it to email you when the beta opens and when Crossband launches for the pairing you picked, and to count how many people are interested. If you picked an Apple Watch with an Android phone, that’s a later version, so we keep your email until it is ready. Our legal basis is your consent. Every email has an unsubscribe link. The list is stored in a Cloudflare D1 database. We delete each entry within 12 months of the launch for its pairing, or remove you sooner if you ask.
The signup form uses Cloudflare Turnstile to check you are a person and not a bot. Turnstile runs in your browser and sends Cloudflare signals about your browser and device for that check. Cloudflare says it doesn’t use this data for advertising. See Cloudflare’s Turnstile privacy addendum.
Support email
If you email us, we keep the conversation and anything you attach so we can help you, and delete it within six months of the last message.
Who else sees your data
We don’t sell or rent personal data. We use Cloudflare (website, waitlist) and our email provider (support) to process data for us. Cloudflare may process data outside the UK, protected by the UK International Data Transfer Addendum and the EU Standard Contractual Clauses.
Your rights
Under UK data protection law you can ask for a copy of your data, ask us to correct or delete it, object to how we use it, and withdraw consent at any time. Email support@crossband.app. Because the apps keep your data on your own devices, you can also delete it yourself by uninstalling the apps and removing the data in Apple Health.
If you’re unhappy with how we handle your data, you can complain to the Information Commissioner’s Office at ico.org.uk.
Children
Crossband isn’t aimed at children under 13, and we don’t knowingly collect their data.
Changes
We’ll update this page when the apps or website change how they handle data, and change the date at the top. If a change matters, we’ll say so in the app.