# sleep² sleeptracker & analysis — Sleep tracker & Sleep Analysis

> Sleep tracker and analysis app with training for sleep disorders. (iPhone/iPad app by Nukkuaa.)

- Source: https://appshunter.io/ios/app/sleep-sleeptracker-and-analysis/id1629426238 (this page in markdown: same URL + `.md`)
- Developer: [Nukkuaa](https://appshunter.io/developer/1629426240)
- Category: Health & Fitness, Medical
- Price: Free with in-app purchases
- Rating: 3.40/5 from 34 App Store ratings · 53 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 107 MB
- Languages: American English, French (France), German (Germany), Hungarian, Italian, European Spanish, Ukrainian
- Released: 2023-10-04
- Data updated: 2026-09-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/sleep-sleeptracker-and-analysis/id1629426238/reviews.md

## What is sleep² sleeptracker & analysis?

Discover Sleep Anew: sleep² - Your Sleep Tracker

sleep² is your personal guide to better sleep. It combines innovative sleep training with a precise sleep tracker. Sleep trackers provide valuable insights into your sleep.

The sleep² Intensive Program is an EU-approved medical device, specifically designed for people with acute sleep disorders like insomnia. Our scientifically based method has already helped thousands improve their sleep quality through systematic and gradual sleep tracking and training.

sleep² Pro: Based on sleep analysis, the program adapts to individual sleep data, delivering precise recommendations from your sleep tracker.

Sleep Tracker: Analyze sleep using a Polar sensor or import data via Apple Health. Manually enter sleep data into the sleep diary if no tracker is used.

Based on the sleep data, you get:

Detailed recommendations based on sleep analysis
Sleep training for better sleep
An interactive chat-bot to help you sleep better
Sleep analyses always available—no waiting like in sleep labs
Precise sleep analysis through innovative algorithms for sleep improvement
Free download & basic functions
Full features of sleep² (precise sleep analysis, personalized programs) with subscription purchase

Download sleep² - Our sleep tracker and precise sleep analysis help improve sleep!

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Sleep tracking and analysis
- Sleep training programs
- Personalized recommendations
- Interactive chatbot
- Data import (Polar sensor, Apple Health)
- Manual sleep diary entry

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| sleep² PRO | $79.99 | per year |
| sleep² PRO | $9.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| sleep² intensive program | $99.99 | one-time |
| sleep² intensive program | $39.99 | one-time |


## Recent user reviews (10 of 53)

All indexed reviews: https://appshunter.io/ios/app/sleep-sleeptracker-and-analysis/id1629426238/reviews.md

### 5/5 — My only remaining sleep tracker

*2026-08-05, version 3.6.18*

I signed up for Sleep2 more than a year ago after reading their initial validation study. I work in health research, and we use Polars for data collection, so decided to try the app out. While it's not perfect, it's the best sleep tracker I have tried, mostly because I believe the data in their study, and virtually all other sleep trackers are very inaccurate. Literally, if you need better than 60% accuracy at a sleep stage level, there are no other consumer options. I would love to see additional validation data, but really they're the only option short of semi-clinical hardware.

I wore it while at a professional sleep study, as well. One night of data is insignificant compared to the number in their studies, but the data aligned quite well with the lab equipment. I also wore a Withings tracker, and that was quite poor.

I wish it had data export. This is my one big request. Sleep2 has been helpful and responsive via email, sending me my sleep data periodically by email, but it's cumbersome. I have a few additional tweaks in the UI that I'd love to see, but they are minor, and even with the export I believe I've found a way around this via Healthkit. The review right before this, with one star, is incorrect. After switching to the Polar Varity, the app has been rock solid. It does not drop your data easily. I use it nightly and have lost maybe two or three nights of data in the last year or two, max. It's a four star app in terms of design - good but with improvements - but it's five stars because I honestly believe it's the only meaningful consumer tracking app there is. That's much more important to me than UI placement.

### 5/5 — Worth The Price

*2026-07-02*

I used both free version and Paid version
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

### 2/5 — Will Not Connect

*2026-06-17, version 3.6.16*

Trying to connect with the Polar H10 is impossible even though my phone is connected and other apps don’t have issues connecting.  Waste of time!

### 1/5 — Connection issues

*2026-05-15, version 3.6.12*

Could be a good app but I wouldn’t know. Connects to my polar H10 at night and I start sleep then when I wake up it can’t end my sleep or connect to my strap. Makes you delete the data.

### 5/5 — Accurate stats

*2026-05-11, version 3.6.12*

Sleep stats

### 1/5 — Sleep scientists, not software developers

*2026-04-30, version 3.6.12*

The app keeps surprising me with new bugs every day - losing my sleep data, not working well offline and a clumsy data entry UX. The sleep science might be solid but the app development skills are lacking. Hard to justify $20 per month for such a frustrating experience

### 4/5 — Bugs

*2026-04-25*

Constantly losing sleep sessions

**Developer response:** 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?

### 5/5 — Sehr hilfreich

*2026-04-24*

Ich verwende seit einigen wochen sleep2 im intensive programm mit einem polar sensor und bin echt positiv überrascht. Jeden morgen bekommt man personalisiertes feedback mit verbesserungsvorschlägen für die nächste nacht und verschiedene übungen und lerneinheiten werden freigeschalten. Kann ich nur empfehlen!

### 1/5 — Incredibly pricey

*2026-03-24, version 3.6.6*

Can you guys actually make it affordable lol. 15$ a month is crazy

### 1/5 — App Crashed and No Data

*2026-02-26*

After spending $500 on two H10 straps, you wake up to a closed app with no data. There is no way to recover your data in the app. Closing the app, repairing the sensor, and following the support documentation all failed. I should have checked the reviews before purchasing.

## Frequently asked questions about sleep² sleeptracker & analysis

### What does the sleep² app do?

The sleep² app functions as a personal sleep guide, offering both innovative sleep training and precise sleep tracking. It provides valuable insights into your sleep patterns and helps you improve sleep quality through scientifically based methods and personalized recommendations.

### What are the key features of sleep²?

Key features include detailed sleep analysis, personalized sleep training programs, an interactive chatbot to assist with sleep, and the ability to analyze sleep using a Polar sensor or import data via Apple Health. You can also manually enter sleep data into a sleep diary.

### How much does sleep² cost?

The app offers a free download with basic functions. Full features, including precise sleep analysis and personalized programs, are available with a subscription purchase.

### Is sleep² compatible with my device?

The app description mentions integration with Polar sensors and Apple Health, suggesting compatibility with devices that support these integrations. For specific device compatibility, it's recommended to check the app store listing.

### Who is the sleep² Intensive Program designed for?

The sleep² Intensive Program is an EU-approved medical device specifically designed for individuals with acute sleep disorders, such as insomnia. It aims to help users improve their sleep quality through systematic and gradual sleep tracking and training.

## Version history (last 5 releases)

### 3.6.18 — 2026-07-06

Minor improvements and bug fixes

### 3.6.16 — 2026-06-11

What's new

- Sleep Factors: The feedback on your sleep factors now more clearly shows which factors are influencing your sleep
- Sleep Score: Trend calculation has been optimized
- Coaching: Improvements to coaching in the intensive program
- Stability improvements and bug fixes

### 3.6.14 — 2026-05-21

The statistics overview is now visible to all users.
Minor optimizations and bug fixes to improve stability and performance.

### 3.6.12 — 2026-04-29

- Intensive program now available in the USA
- Sleep coach improvements
- Minor bug fixes and improvements

### 3.6.9 — 2026-04-15

Various bug fixes and improvements.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*