# Train.Red APP — Muscle Tracking & Training > Muscle oxygen tracking and performance analysis app with real-time insights. (iPhone/iPad app by Train.Red B.V..) - Source: https://appshunter.io/ios/app/trainred-app/id6451237438 (this page in markdown: same URL + `.md`) - Developer: [Train.Red B.V.](https://appshunter.io/developer/1646391181) - Category: Health & Fitness, Sports - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 13.0 · 101 MB - Languages: American English - Released: 2023-12-28 - Data updated: 2026-07-30 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/trainred-app/id6451237438/reviews.md ## What is Train.Red APP? About this app The official app for the Train.Red muscle oxygen sensors, the new metric for performance. To move, your muscles need energy. The most efficient way to get this energy requires oxygen. We measure the oxygen saturation in your muscles to help you improve. Not every athlete has a team of scientists helping them with their physiological data, we measure data from your muscle and translate this into useable insights, in real-time. - Monitor your physiological power and perform easy exercise tests as an endurance athlete. - Know when your muscle is fully recovered and ready for the next set when doing strength. What’s more? - Cloud functionality to allow workout analysis at home, even when you perform in the gym. - A Team/organisation structure that allows multiple athletes to use the sensors. - Actionable insights after your training or scientific analysis with access to raw data. - Live view with data overlay to match measured fatigue with movement patterns. - Muscle States, Protocols, Dashboard, Training Menu, Muscle Stress Score, and much more. How to start with Train.Red: Create a user profile and connect your sensor. No sensors yet? The Train.Red app requires the Train.Red sensors for full functionality (https://train.red/). Connected your FYER or PLUS? Nice, you are ready to BE AHEAD. What does Train.Red do for me: Whether you’re an athlete, coach, scientist, physio, or anyone involved in sport, Train.Red has something to offer you. Simply because your muscles play a key role in human movement. We track your muscle oxygenation, more specifically, the hemoglobin concentration changes. The Train.Red sensors measure: - SmO2, Muscle Oxygen Saturation (%) - O2Hb, Oxyhemoglobin (mM) - Hhb, Deoxyhemoglobin (mM) - Thb, Total hemoglobin (mM) - HbDiff, the Hemoglobin Difference (mM) If this sounds like Abracadabra, no worries. We display the oxygen saturation in your muscle live and use the other metrics to provide you with actionable insights in real-time. Our AI and advanced analysis options translate this data into 5 different muscle states showing you if your muscle is recovering, or approaching its limits. If this physiological data sounds familiar, perfect. We allow exporting your data to .csv or .fit files for an in-depth analysis of all your data. Every single training session is stored in our cloud and can be analyzed or exported afterward. How do I use Train.Red? The Train.Red sensor is a light-based wearable that you wear directly on your skin. You’re free to place the sensor anywhere on your body but know that this is a hyperlocal metric that will only tell you something about the exact location you place the sensor. We recommend wearing the sensor on a primary involved locomotor muscle, a place on your body that is active during the activity you’re performing. e.g. on your thigh during cycling or squats, the middle part of your upper leg during running, or on your lower arm during climbing. Of course, you are free to use more than one sensor! You can connect up to 4 sensors simultaneously and measure multiple areas at once. You’re not bound to this smartphone application. The Train.Red hardware is integrated into 3rd party apps allowing you to easily synchronise your data from multiple sources. Train.Red sensors can be connected to most Wahoo’s, Garmin’s, Suunto’s and several other devices. More information can be found on our website https://train.red/ ## Key features - Muscle oxygen saturation monitoring - Real-time physiological insights - Performance and recovery tracking - Workout analysis and data export - Team/organization structure - Live data overlay ## Frequently asked questions about Train.Red APP ### What does Train.Red do? Train.Red monitors muscle oxygen saturation (SmO2) and other hemoglobin metrics to provide real-time physiological insights. This helps users understand muscle performance, recovery, and optimize their training. ### Does Train.Red require a sensor? Yes, the Train.Red app requires the official Train.Red sensors for full functionality. These sensors are light-based wearables that attach directly to the skin. ### What kind of data does Train.Red measure? Train.Red measures SmO2 (Muscle Oxygen Saturation), O2Hb (Oxyhemoglobin), Hhb (Deoxyhemoglobin), Thb (Total hemoglobin), and HbDiff (Hemoglobin Difference). ### Can I export my data from Train.Red? Yes, you can export your training data to .csv or .fit files for in-depth analysis. Every training session is stored in the cloud and can be analyzed or exported afterward. ### Where should I place the Train.Red sensor? The sensor can be placed anywhere on the body, but it's recommended to wear it on a primary involved locomotor muscle relevant to your activity, such as the thigh during cycling or the upper leg during running. ### What devices is Train.Red compatible with? Train.Red is available for iPhone, iPad, and iPod. It is designed to work with the Train.Red muscle oxygen sensors. ### How often is Train.Red updated? The latest version of Train.Red is 2.3.0, which was last updated on May 20, 2026. Updates typically occur to improve functionality and add new features. ### What is the user sentiment for Train.Red? Train.Red has a perfect rating of 5.0 stars from 1 rating, indicating very positive initial user sentiment. Users appreciate its advanced physiological tracking capabilities. ## Version history (last 5 releases) ### 2.3.3 — 2026-07-26 - fixed issues with language settings ### 2.3.2 — 2026-07-14 - Improved export behavior for CSV- and FIT-files - Fixed PLUS sensor timestamps ### 2.3.1 — 2026-06-28 App Updates Italian and Japanese Translations New firmware Enabling larger and better performing sessions through better memory management Female muscle selection ### 2.3.0 — 2026-05-20 App Updates Refreshed and improved user interface for a smoother experience General bug fixes and performance improvements New Team Cloud & Coach functionality Share training sessions directly with your trainer, coach, club, or gym Add notes and communicate within shared sessions Coaches and trainers can now remotely monitor athlete data, provide feedback, and gain better insights into training performance through the Train.Red platform Improved import and export functionality for easier data management Support for the new Train.Red FYER 2.0 firmware Support for the new Train.Red PLUS 2.0 firmware Firmware Updates General bug fixes and stability improvements Optimized MacBook connectivity for improved offline data syncing and transfer Added support for extra 100 Hz offline IMU data recording and export functionality ### 2.2.4 — 2025-11-24 !Hotfix for migration! New Features Significant upgrade to the Test feature, now including almost 30 sport-specific tests, max and submax protocols. Advanced analytics for determining thresholds and additional performance metrics Improvements & Fixes Firmware updates across all devices for improved stability and performance Battery performance improvements addressing previously reported issues Resolved bugs that could cause the system to remain in processing mode or fail to detect sensors ## Apps similar to Train.Red APP | App | Rating | Price | Category | | --- | --- | --- | --- | | [Watchletic - Run tracker](https://appshunter.io/ios/app/watchletic-run-tracker/id1606429298) | 4.5 (28) | Free | Health & Fitness | | [Workout Wanderer](https://appshunter.io/ios/app/workout-wanderer/id6748683634) | — | Free | Health & Fitness | | [FLEX Stronger](https://appshunter.io/ios/app/flex-stronger/id1452436164) | 4.4 (8) | Free | Health & Fitness | | [Moxy Portal App](https://appshunter.io/ios/app/moxy-portal-app/id1566649779) | 5.0 (3) | Free | Health & Fitness | | [Training Today](https://appshunter.io/ios/app/training-today/id1507992127) | 4.6 (2,602) | Free | Health & Fitness | | [StrongerLab: Workout Log](https://appshunter.io/ios/app/strongerlab-workout-log/id1619046866) | 5.0 (1) | Free | Health & Fitness | ## Related topics [red mobile](https://appshunter.io/ios/topics/red-mobile) --- *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 2026-07-30.*