Sleep Cycle is a sleep-tracking app (smart alarm, snore/breathing sound analysis via microphone, sleep-stage detection) published by Sleep Cycle AB (org. no. 556614-7368), a Gothenburg, Sweden company that IPO'd and has traded on Nasdaq Stockholm under ticker SLEEP since 2021. Its Privacy Policy states health-related personal data is stored locally on the device by default, and the company is not the data controller for data processed only on-device; account, technical, and (with consent) health data may be sent to Sleep Cycle's servers, hosted on Google Cloud, with a separate product-development copy processed by analytics vendor Amplitude Inc. and its infrastructure provider AWS. Sleep Cycle's Apple App Store privacy label discloses Identifiers used to track users across other companies' apps and websites, and a broader set of data (Health & Fitness, Purchases, Location, Contact Info, Identifiers, Usage Data, Diagnostics) linked to identity and used for purposes including Developer's Advertising or Marketing (for Location/Contact Info/Identifiers specifically, not health data), Analytics, and Product Personalization. No explicit "we do not sell personal data" pledge, named third-party security audit, or regulatory enforcement action was found in the sources checked.
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Sleep Cycle's Privacy Policy states that as a default setting, personal data related to a user's health is stored only locally on the device, and Sleep Cycle is not the data controller for data processed locally; the same policy separately describes the sensor and input data the app collects to generate sleep data, including accelerometer, microphone, camera, and device location.
Sleep Cycle's Apple App Store privacy label states that data linked to a user's identity includes Health & Fitness, Purchases, Location, Contact Info, Identifiers, Usage Data, and Diagnostics; per the label's underlying purpose breakdown, Health data specifically is used for Analytics and Product Personalization purposes, while Location, Contact Info, and Identifiers are used for the developer's own Advertising or Marketing purpose.
Sleep Cycle's own investor relations site states the company is headquartered in Gothenburg and listed on Nasdaq Stockholm under the ticker SLEEP, with its Initial Public Offering completed in 2021 -- independently verifiable via the exchange, unlike a purely self-reported ownership claim.
Sleep Cycle's Privacy Policy names Sleep Cycle AB, Swedish company registration number 556614-7368, headquartered at Drakegatan 10, Gothenburg, Sweden, as the data controller responsible for processing personal data under the GDPR.
Sleep Cycle's Privacy Policy states user data is stored on secure servers hosted by Google Cloud, and that a separate copy used for product development is hosted by analytics vendor Amplitude Inc. and its infrastructure provider Amazon Web Services; the same policy states that, with consent, Sleep Cycle may share personal data (including health data) publicly and with third parties, for example in public reports, with partners under agreement, as part of community benchmarking, or with a named investigator if a user opts into a research study.
Sleep Cycle's Privacy Policy states that data is generally encrypted in transit and at rest, and that the copy of data held by analytics vendor Amplitude Inc. and Amazon Web Services is pseudonymised -- a self-reported security measure; no named third-party security audit, certification, transparency report, or regulatory enforcement action against Sleep Cycle AB was found in the sources checked.
Sleep Cycle's Apple App Store privacy label discloses that Identifiers collected by the app may be used to track users across apps and websites owned by other companies -- i.e., cross-app/cross-site tracking is self-disclosed, though limited to the Identifiers category rather than a broader set of data types.