Clue Cycle & Period Tracker is a health and wellness app designed to help you track your menstrual cycle and understand your body's patterns. I've been using it for a couple of years now, and it's become my go-to for keeping an eye on my cycle. The app launched back in 2013 and you can easily download it from both Google Play and the App Store. It has millions of installs on Google Play alone, which shows how popular it is. The best part? It's completely free to download and install. You don't need to register with an email right away to start using it, which I really appreciate for privacy. There are no annoying ads cluttering up the experience, and while there is a premium subscription called Clue Plus, the free version is incredibly powerful on its own. You don't feel pressured to upgrade to use the core features.

Using the app is super straightforward. When you first open it, you log your period start and end dates. Over time, you can add details like flow intensity, symptoms (like cramps or mood swings), energy levels, and even things like sleep and exercise. The more you track, the better its predictions become. A simple tip from a long-time user: try to log something every day, even if it's just a quick note on your mood or if you took a pain reliever. This habit makes the predictions scarily accurate. The main calendar view is clean and color-coded, so you can see your cycle phase at a glance. I mainly use it to predict my next period and ovulation window, which has been a game-changer for planning trips or important events.

Compared to other period tracker apps I've tried, like Flo, Clue stands out for its no-nonsense, science-based approach. Flo can feel a bit more chatty and community-focused, which some people love, but I prefer Clue's clean, data-driven interface. It feels less like a social magazine and more like a personal health tool. Some apps bombard you with ads or lock basic features behind a paywall immediately, but Clue gives you a truly functional tracker for free. I chose it over others because it respects my data privacy—they are transparent about their policies—and the predictions have consistently been the most reliable for me. It doesn't use fluffy language; it just gives you the facts about your cycle, which I trust more.

• 📱 Accurate Cycle Predictions: The app's algorithm learns from your logged data to forecast your period and fertile window with impressive precision, often more reliably than broader apps like Flo.
• 📱 Comprehensive Symptom Tracking: You can log a wide array of physical and emotional symptoms, sleep, and activity, giving a holistic view of your cycle that many simpler trackers lack.
• 📱 Clean, Science-Backed Design: The interface is intuitive and free of clutter, focusing on data visualization over generic health articles, setting it apart from more commercial competitors.
• 📱 Strong Privacy Focus: Clue is known for its commitment to data security, a standout feature compared to some apps that share more user data with advertisers.

• ✅ Prediction Reliability: Its forecasts for period and ovulation windows are consistently spot-on, often more accurate than other free trackers I've used.
• ✅ User-Friendly Design: The clean calendar and simple logging make daily use effortless, without the confusing layouts of some similar apps.
• ✅ No Ad Interruptions: The complete lack of banner or video ads in the free version provides a peaceful experience unlike many ad-supported alternatives.

• ⚠️ Limited Free Customization: Some tags and detailed insights are locked in Clue Plus, whereas apps like Flo offer more free personalization options.
• ⚠️ Less Community Focus: It lacks built-in forums or direct peer support, which might be a downside for users seeking that social connection.