Top Free Apps for Tracking REM Cycles and Sleep Stages

This popular app uses the phone's microphone and accelerometer to detect movement and breathing patterns during sleep. It provides detailed charts of sleep stages and features a smart alarm that wakes you during your lightest sleep phase, typically within a 30-minute window, to help you feel more rested.

Pillow offers a comprehensive sleep analysis dashboard that tracks sleep quality, duration, and cycles using the iPhone's accelerometer or connected wearables. Its clean interface presents easy-to-read graphs and tips for improving sleep hygiene, with a robust free version that covers essential tracking needs.

An advanced sleep tracking application for Android users that supports various smartwatches and uses sound or motion to analyze sleep phases. It includes features like smart alarms, breathing exercises, and detailed sleep reports, offering a high degree of customization for users interested in deep data analysis.

This app focuses on simplicity and privacy, tracking sleep cycles and snoring detection using the device's microphone without uploading sensitive audio data to the cloud. It provides clear insights into sleep consistency and duration, making it an excellent choice for users who prioritize data security alongside basic tracking.

Designed specifically for Apple Watch users, AutoSleep automatically tracks sleep and activity metrics without requiring manual input. It converts complex health data into a simple daily score, offering detailed breakdowns of sleep stages and trends over time, with the free version providing substantial tracking capabilities.

While primarily focused on snoring detection, SnoreLab also tracks sleep duration and sleep quality metrics based on movement and sound intensity. It provides actionable reports on snoring frequency and helps users identify potential disruptions in their REM and deep sleep cycles caused by external noises.

BetterSleep combines sleep tracking with a vast library of soundscapes to aid relaxation and sleep maintenance. Its tracking feature monitors sleep periods and provides insights into sleep consistency, allowing users to correlate their sleep environment with their rest quality through its integrated meditation and sound tools.

While the Oura Ring requires hardware, its companion app offers limited free access for users who already own the device, providing deep insights into REM sleep, respiratory rate, and body temperature. This tier allows new users to see the depth of data available before committing to a subscription.

A straightforward sleep tracker that uses the phone's microphone to analyze sleep sounds and movement. It provides a daily report card summarizing sleep quality and offers insights into sleep habits, helping users understand the impact of their daily routines on their overall rest and energy levels.

ShutEye offers a holistic approach by combining sleep tracking with cognitive behavioral therapy techniques and personalized sleep plans. Its free version provides detailed sleep stage analysis and mood tracking, helping users connect their sleep quality with their emotional well-being and daily activities.

This lightweight app tracks sleep duration and quality using the device's sensors, offering simple visualizations of sleep patterns. It is designed for users who want minimalistic tracking without complex features, focusing on providing clear feedback on sleep consistency and nightly rest scores.

NightOwl provides detailed sleep analysis with a focus on circadian rhythm optimization. It tracks sleep stages and offers personalized recommendations based on biological clocks, helping users align their sleep schedule with their natural body rhythms for improved REM cycle quality and daytime alertness.

Slumber is a minimalistic sleep tracker that emphasizes privacy by processing data locally on the device. It offers basic sleep stage detection and duration tracking, making it a suitable option for users who want to monitor their sleep patterns without subscribing to cloud-based services or sharing sensitive health data.

This app allows users to manually log sleep habits alongside automated tracking, providing a comprehensive view of how lifestyle choices affect sleep quality. It includes reminders for bedtime routines and detailed reports that highlight trends in sleep duration and stages over several weeks.

Although primarily known for its hardware, Zeo's software ecosystem provided some of the earliest detailed REM sleep tracking for consumers. While no longer actively sold, archived data and community discussions remain valuable resources for understanding long-term REM trends and sleep stage variability.

Sleep++ offers a user-friendly interface for tracking sleep cycles and provides educational content about sleep science. It helps users understand the importance of different sleep stages, including REM and deep sleep, through guided tips and visualizations that explain how to improve overall sleep health.

Focusing on the pre-sleep phase, this app uses breathing exercises to help users fall asleep faster, indirectly improving REM cycle continuity by reducing sleep onset latency. It tracks sleep duration after falling asleep and provides insights into how relaxation techniques impact overall sleep quality.

Integrating with various Wear OS and Fitbit devices, this app enhances sleep tracking accuracy by utilizing heart rate data in addition to motion. It provides more precise detection of REM and deep sleep stages, offering users a deeper understanding of their physiological recovery during sleep.

Pillo uses AI to provide personalized sleep coaching and tracking, analyzing sleep data to offer tailored advice for improving sleep hygiene. Its free tier allows users to monitor basic sleep metrics and receive insights on how to optimize their environment for better REM sleep and overall rest.

A stripped-down version of the popular Sleep Cycle app that offers basic sleep tracking and alarm functionality without premium features. It serves users who need reliable sleep stage detection and smart waking capabilities without the need for advanced analytics or integration with external health platforms.