Worth The Price
I would absolutely recommend the app because the Data presentation and The accuracy of the metrics is extremely good and It actually helped me become better at my sleep anxiety and sleep apnea
The support is actually very good and they are easy to contact if you have any query or any question regarding the app
I would absolutely recommend this app
Will Not Connect
Response from developer
We’re very sorry for the frustration - this is definitely not the experience we want you to have. With the Polar H10, it is important that the sensor is not already paired or actively used by another app, as this can block sleep² from accessing it! Please try the following sequence: 1.) Ppen Polar Flow once, check for firmware updates and reset the sensor to factory settings. 2.) Then fully close Polar Flow and any other apps that may use the sensor. 3.) disconnect/forget the H10 in your phone’s Bluetooth settings 4.) After that, please connect the H10 only directly inside the sleep² app (not through Bluetooth settings first). If it still does not work, please contact us at hello@sleep2.com. We’ll gladly help you personally and hopefully change your impression of the app.
Connection issues
Response from developer
Hello Pat9710! We’re very sorry for the frustration-especially when the recording starts correctly at night but cannot be completed in the morning. With the Polar H10, this can sometimes happen if the chest strap shifts during sleep or loses skin contact, resulting in insufficient signal quality for a reliable analysis. Does this happen every night or only occasionally? And do you see a specific error message when trying to end the recording or read out the data? Please contact us at hello@sleep2.com with these details. We’d really like to review your case individually and find a practical solution for you! If we can get this working reliably, we’d of course be very happy if your impression and your rating changes accordingly.
Accurate stats
Response from developer
Hi JohnJohn! Thanks so much for your trust in our measurement accuracy – we really appreciate it! 😊 We're continuously working on refining the user experience and your feedback is very valuable in that process. If you’d like to share specific suggestions, feel free to reach out to us at hello@sleep2.com .... we’d love to hear from you!
Sleep scientists, not software developers
Bugs
Response from developer
Sorry to hear that, Villy_vonka! Losing sleep sessions is frustrating – but in most cases, there's a simple solution (e.g. the sensor is still connected to another app like Polar Flow). Just reach out to us at hello@sleep2.com – we’ll help you get it working smoothly again. Maybe you'll feel differently about the app once it’s all running properly?
Sehr hilfreich
Incredibly pricey
App Crashed and No Data
Very Accurate sleep data !
Response from developer
Thank you so much for your great feedback:) We are happy that you like the app & appreciate the precise sleep tracking with H10!
eingeschränkte track möglichkeit
Response from developer
Vielen Dank für die positive Bewertung und dein wertvolles Feedback! Wir freuen uns, dass dir die App gefällt und werden deinen Wunsch - den Mittagsschlaf zu tracken - bei zukünftigen Entwicklungen beachten!
Falsely Advertised
Response from developer
Thank you for your detailed feedback - we’re sorry to hear about your experience. Regarding the metrics, we’d really like to better understand what exactly was missing or unclear in your case. Please feel free to contact us at hello@sleep2.com so we can review this with you in detail. Concerning the recording: our algorithm requires sufficient data quality. If more than ~20% of the signal is affected (e.g., due to loss of skin contact or signal interruptions), we cannot provide a reliable analysis - in such cases, the recording may be discarded to avoid misleading results. We appreciate your feedback and are continuously working on improvements.
Good But Needs Improvement
That said, the app experience itself holds it back.
First, as others have mentioned, the app occasionally freezes or fails to process the night’s recording — resulting in a complete loss of data. I’ve tried returning to the app multiple times over the past year hoping this issue had been resolved, but it still occurs. Losing an entire night of data is frustrating, especially when accuracy is the main reason for using it.
Second, the interface feels dated. It’s functional, but visually it looks retro — almost like something from the 1970s. A modern redesign would go a long way in improving the overall experience.
Third, the subscription price (around $19.99/month) feels steep given the stability issues. For an app at this price point, seamless data transfer and reliability should be expected.
Finally, it would be extremely helpful to allow multiple sleep sessions per calendar day. For those of us with fragmented sleep or irregular schedules, the current limitation makes tracking less practical.
In short, the sensor + app combination offers superior data compared to most other trackers. However, without consistent reliability and smoother usability, it’s fair to question whether it justifies the monthly subscription cost.
Response from developer
Thank you for your detailed and thoughtful feedback! We truly appreciate both your positive remarks on accuracy and your critical points! We’re glad to hear that you value the data quality - that’s exactly where sleep² aims to stand out, especially with Polar sensors. At the same time, we fully understand how frustrating it is to lose a full night of data. In many cases, this is related to firmware versions, connection interruptions or parallel connections (with other apps or bluetooth settings). Your feedback on the UI, pricing and multi-session tracking is very valuable- we will consider your points in future updates! Please reach out to us at hello@sleep2.com - we’d really like to review your case in detail and see if we can find a suitable solution for you!
Great insight
Response from developer
Hi MerlinMetals, thank you very much for your positive feedback:) We’re happy to hear that everything works well for you and that you’re satisfied with the sleep tracking using the Polar H10. The Polar H10 provides high-quality raw data, which allows our algorithm to perform a much more precise sleep stage analysis than many consumer wearables. This is exactly why the combination works so well! We truly appreciate your trust in sleep² and wish you continued valuable insights into your sleep.
Very expensive and terrible with connecting to H10 Polar strap
And it’s extremely overpriced. You probably would have a lot more people willing to pay if you lowered the price. Your profit would increase by more customers. I would expect seamless connections with my Bluetooth device as well.
Response from developer
Thank you for your feedback. You’re absolutely right - after a recent update, the former “More” section was renamed, and all related settings can now be found under “Profile”, including the Apple Health integration. We’re updating the FAQ accordingly to avoid further confusion. The basic version is available free of charge, while the added value lies in the paid version, which reflects the continuous development and scientific validation of our algorithms as well as the ongoing improvement of the app. If you have any questions, please feel free to contact us anytime at hello@sleep2.com - we’re always happy to help and clarify things directly.
Very expensive and needs some updating
In general the permissions are now different for Health integration.
And it’s extremely overpriced
Response from developer
Thank you for your feedback. You’re absolutely right - after a recent update, the former “More” section was renamed, and all related settings can now be found under “Profile”, including the Apple Health integration. We’re updating the FAQ accordingly to avoid further confusion. The basic version is available free of charge, while the added value lies in the paid version, which reflects the continuous development and scientific validation of our algorithms as well as the ongoing improvement of the app. If you have any questions, please feel free to contact us anytime at hello@sleep2.com - we’re always happy to help and clarify things directly.
Meine neue Lieblingsbeschäftigung
Response from developer
Hi LeoMaximilianNu - Vielen Dank für deine großartige Bewertung:) Wir wissen deine Rückmeldung sehr zu schätzen und freuen uns, wie begeistert du nach den ersten Tagen von sleep² bist! Besonders schön ist, dass dir sowohl die hochpräzise Schlafanalyse (Pro) als auch das Schlaftraining (Intensiv) einen echten Mehrwert bieten und du unseren wissenschaftlichen Hintergrund zu schätzen weißt! Super, dass du über die TK zwölf Monate lang kostenlos Zugang sleep² erhältst, freut uns ebenfalls. Wir wünschen dir weiterhin viele positive Erfahrungen auf deinem Weg zu einem gesunden und erholsamen Schlaf:) Wenn du mal Fragen hast oder Hilfe benötigst, melde dich gern jederzeit unter hello@sleep2.com bei uns
Overrated
Room for improvement
Response from developer
Thank you for your honest feedback! We're really sorry to hear about the issues you've experienced. We're continuously working to improve performance and your input helps us prioritize. If you're open to it, we'd love to better understand what happened and assist you directly – feel free to reach out at hello@sleep2.com :) Hopefully, we can turn your experience around.
Lots of potential
Response from developer
Hi JohnJohn! Thanks so much for your trust in our measurement accuracy – we really appreciate it! 😊 We're continuously working on refining the user experience and your feedback is very valuable in that process. If you’d like to share specific suggestions, feel free to reach out to us at hello@sleep2.com .... we’d love to hear from you!
