Choosing a period tracker comes down to fit, not feature count. The best app is the one you will still open every day in three months — because a half-used tracker can't show you patterns. As you compare options, weigh the things that actually matter day to day: accurate predictions that adapt to your cycle, mood and symptom tracking alongside your dates, clear privacy, and a calm interface that doesn't make logging feel like homework.
The guides below break down the big apps (Flo, Clue, Glow, Stardust), what to look for in a simple or couples-friendly tracker, and how MoodSwings fits — built lean and couples-aware, focused on the everyday "when is my period and how will I feel." Prefer to just try something? The free calculators below give you an instant estimate.