# ReadiOne by Fatigue Science > Personal fatigue risk assessment and prediction tool based on sleep analysis. (iPhone/iPad app by Fatigue Science.) - Source: https://appshunter.io/ios/app/readione-by-fatigue-science/id1042111872 (this page in markdown: same URL + `.md`) - Developer: [Fatigue Science](https://appshunter.io/developer/1042111871) - Category: Health & Fitness - Price: Free - Rating: 3.85/5 from 13 App Store ratings · 11 written reviews indexed - Age rating: 4+ - Requires: iOS 14.0 · 69 MB - Languages: English - Released: 2016-09-02 - Data updated: 2026-08-03 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/readione-by-fatigue-science/id1042111872/reviews.md ## What is ReadiOne by Fatigue Science? ReadiOne is a personal application designed for operators or workers to visualize their realtime and future fatigue levels (ReadiScores) and timing of greatest fatigue risk exposure, ensuring that users are fit for duty during the shift ahead. ReadiOne uses the SAFTE biomathematical model to analyze your sleep in order to quantify and predict the impact it will have on your performance for the day ahead. Sleep can come from wearable data (ReadiWatch, Gamin, or Fitbit) or can be estimated by the ReadiML sleep forecasting engine. Any disruption to your normal sleep, whether from sleep loss, jet lag or night duty, can significantly impact your ability to perform safely and effectively. Specifically, sleep impacts your cognitive performance, reaction time, and lapse likelihood (propensity for a micro sleep). When you wake up, open the ReadiOne application and you'll receive a personal risk assessment ("ReadiScore") for each of the 18 hours ahead, enabling you to easily visualize if and when you'll be at your best and worst in the day ahead. You'll also be able to track daily improvements to your readiness over time, and you'll receive alerts before your fatigue may reach critical levels. ReadiOne is based on validated algorithms developed with 25 years of sleep research from the US Army Research Lab, and available exclusively from Fatigue Science. Use of ReadiOne requires an enterprise license to the Readi Fatigue Risk Management Platform. Please see ReadiSupervise by Fatigue Science for supervisor mobile fatigue management tools or visit https://app.fatiguescience.com for web based fatigue management tools. ## Key features - Real-time and future fatigue level visualization (ReadiScores) - SAFTE biomathematical sleep analysis - Wearable data integration (Gamin, Fitbit) - Sleep forecasting engine (ReadiML) - Personal risk assessment for 18 hours ahead - Alerts for critical fatigue levels - Track daily readiness improvements ## Recent user reviews (10 of 11) All indexed reviews: https://appshunter.io/ios/app/readione-by-fatigue-science/id1042111872/reviews.md ### 1/5 — No funciona la aplicacion *2023-05-29, version 3.8.5* Se queda solo el poner correo, no avanza mas la aplicación asi llegue los códigos o pin, Mala aplicación ### 1/5 — Stupid *2022-10-04, version 3.8.5* Can’t create an account without a code. Can’t get the code without creating an account. ### 4/5 — Made me notice my fatigue *2021-02-13, version 3.4.2* I have used this app for a while now and am impressed by it's simplicity. Its fatigue detection is quite accurate. Sometimes when I find myself feeling very tired around midday and look at app, it actually shows a dip in my fatigue score. I use a Fitbit Versa 2 to track my data and I see this app also supports Garmin, which is great. But it would be great if we could use this app without requiring a tracking device. What if I wanted to switch to a different tracker like an Apple watch? ### 4/5 — Keeps improving *2021-01-22, version 3.4.2* Glad to see updates! Old review: The app is good. But the new view makes it harder to see the exact same stuff. I agree with having a trends button to see extra information (and further into the past, please) but I shouldn't have to go there to see things that used to be on the home screen. ### 2/5 — Logs me out of app randomly *2020-06-03, version 3.2.2* When it works it’s great but from time to time it logs me out of the app and I can’t log back in. Instead of logging in with username and password it promps you to put in your email so it can send you a link. Well no link is ever sent making it impossible to sign in for days on end. ### 1/5 — Not good *2020-04-20, version 3.2.1* Random glitches will work for a few days and then a new issue will spring up. Latest one is it stopped syncing with Fitbit then it won’t unpair Fitbit device to reset everything. I have lost days of sleep data that just randomly disappears from time to time. ### 1/5 — No registra *2020-02-04, version 3.0.5* Cuando pide el correo para el registro se queda ahí, no avanza más para configurarlo. ### 1/5 — Still no Garmin *2020-01-29, version 3.0.5* Still no ability to pair Garmin products despite press release saying so 2 months ago. Now version update notes say updated “garmin integration", but still no support to pair garmin products nor any visible front end garmin ability whatsoever. ### 1/5 — Misleading *2019-11-13* Can’t even access this without some other equipment. Useless to evaluate. ### 3/5 — Needs an Apple Watch app. *2019-09-15, version 2.0.14* As an Apple Watch owner I think this is a no brainer. I hate having to wear both when Apple Watch does everything needed for this to work. ## Frequently asked questions about ReadiOne by Fatigue Science ### What is ReadiOne's primary function? ReadiOne provides personal fatigue risk assessments and predicts performance impacts based on sleep analysis. It helps users visualize their fatigue levels and identify periods of greatest risk exposure. ### How does ReadiOne analyze sleep? ReadiOne uses the SAFTE biomathematical model to analyze sleep data. This data can come from wearable devices like Gamin or Fitbit, or be estimated by the ReadiML sleep forecasting engine. ### What kind of information does ReadiOne provide after waking up? Upon waking, ReadiOne provides a personal risk assessment, known as a 'ReadiScore,' for each of the 18 hours ahead. This allows users to easily see when they are likely to be at their best and worst. ### Does ReadiOne require an enterprise license? Yes, use of ReadiOne requires an enterprise license to the Readi Fatigue Risk Management Platform. It is designed for organizational use rather than individual purchase. ### What devices does ReadiOne support? ReadiOne is available for iPhone, iPad, and iPod. It is designed to be accessible on Apple mobile devices. ### How often is ReadiOne updated? The latest version, 4.6.0, was released on January 19, 2026. While the last update date is in the future, this indicates the app is actively maintained and developed. ### What is the age rating for ReadiOne? ReadiOne has an age rating of 4+. This means it is considered appropriate for users aged 4 and above. ### Does ReadiOne have ads? No, ReadiOne does not contain advertisements. The app is free to use and does not display any ads to users. ## Version history (last 5 releases) ### 4.6.5 — 2026-05-13 The Sleep Escalation Card keeps you informed when your sleep data is under review. Apple Health integration available for beta users. Bug fixes and performance improvements. ### 4.6.4 — 2026-04-07 Bugfixes ### 4.6.0 — 2026-01-19 Off-wrist management, biometric sign-in, Survey Plans enhancements, support for the latest ReadiWatch firmware, general performance improvements and bug fixes. ### 4.5.0 — 2025-12-03 Bluetooth syncing speed improvements. Added a Beta label to Background Sync. ### 4.4.0 — 2025-10-29 Misc. bug fixes ## Apps similar to ReadiOne by Fatigue Science | App | Rating | Price | Category | | --- | --- | --- | --- | | [Farmácia Rosário](https://appshunter.io/ios/app/farmacia-rosario/id1604958600) | — | Free | Health & Fitness | | [AlertMeter](https://appshunter.io/ios/app/alertmeter/id1179939295) | 4.4 (16) | Free | Health & Fitness | | [Мир фитнеса](https://appshunter.io/ios/app/id1605059060) | — | Free | Health & Fitness | | [Fox River MedSpa](https://appshunter.io/ios/app/fox-river-medspa/id1618493940) | — | Free | Health & Fitness | | [Ravs Fitness](https://appshunter.io/ios/app/ravs-fitness/id1613306660) | — | Free | Health & Fitness | | [Stephitness](https://appshunter.io/ios/app/stephitness/id1617777860) | 4.7 (17) | Free | Health & Fitness | ## More apps by Fatigue Science - [ReadiSync by Fatigue Science](https://appshunter.io/ios/app/readisync-by-fatigue-science/id1044418061) - [ReadiSupervise](https://appshunter.io/ios/app/readisupervise/id1615094054) All apps by Fatigue Science: https://appshunter.io/developer/1042111871 ## Related topics [fatigue science](https://appshunter.io/ios/topics/fatigue-science) · [readione by fatigue science](https://appshunter.io/ios/topics/readione-by-fatigue-science) · [readisync by fatigue science](https://appshunter.io/ios/topics/readisync-by-fatigue-science) · [fatigue assistant](https://appshunter.io/ios/topics/fatigue-assistant) · [fafig](https://appshunter.io/ios/topics/fafig) --- *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 2026-08-03.*