The 5 Best Period Tracking Apps 2025: Calculate Your Cycle & Always Be Prepared

Period tracking apps have become essential tools for millions of people worldwide. They help calculate the menstrual cycle, identify patterns, and make everyday planning easier. Even the best app cannot always predict everything accurately, which is why having a reliable backup plan, like allthingsdaysie period underwear, is wise.

How to Calculate Your Menstrual Cycle

Your cycle begins on the first day of bleeding and ends the day before your next period starts.

• Average length: 28 days

• Normal range: 21–35 days

• For accuracy: Track over several months

Digital apps simplify this process by logging data, tracking symptoms, and sending reminders – they serve as more than just a calendar.

Top 5 Period Tracking Apps 2025

1. Clue

🌐 helloclue.com | iOS | Android

iPhone screenshot of the Clue app: Cycle overview, calendar view, symptom tracking, and pattern analysis.

Clue is one of the most popular cycle apps worldwide, valued especially for its scientific foundation and strong stance on data privacy.

Key Features:

• Ad-free & clean design → distraction-free use

• Science-based → developed with doctors and researchers

• Detailed tracking → PMS, mood, energy, sleep, skin, and more

• Privacy protection → GDPR-compliant data handling

💡 Why users like it: Clue stands for accuracy and trust – a combination that matters to many.

2. Flo

🌐 flo.health | iOS | Android

iPhone screenshot of the Flo app: Prediction of the next period, ovulation calendar, couple’s tips, and symptom logging.

Flo is the world’s most downloaded cycle app, with over 300 million downloads and around 58 million monthly active users. It’s popular for its user-friendly design and rich features.

Key Features:

• Smart predictions → AI-based, improving over time

• Symptom tracking → mood, skin, energy, pain

• Health content → expert articles and tips

• Community → anonymous forums for exchange

• Freemium model → free basic version, premium for extras

💡 Why users like it: Flo combines intuitive usability with health knowledge and a strong community.

3. Apple Health – Cycle Tracking

🌐 Apple Health Info (pre-installed on iPhones)

Screenshot of Apple Health on iPhone and Apple Watch: Cycle log with menstruation and symptom tracking.

For iPhone users, cycle tracking is built directly into Apple Health – no additional downloads required.

Key Features:

• Pre-installed on iOS → no extra setup needed

• Integration → syncs with Apple Watch and other health data (sleep, steps, nutrition)

• Privacy-first → encrypted and under user control

• Simple interface → perfect for minimalists

💡 Why users like it: Free, secure, and seamlessly integrated into the Apple ecosystem – ideal for iPhone and Apple Watch users.

4. Natural Cycles

🌐 naturalcycles.com | iOS | Android

iPhone screenshot of the Natural Cycles app: Prediction of the period, fertility overview, and symptom tracking.

Natural Cycles is the first app approved as digital birth control (FDA-cleared in the US and CE-marked in Europe).

Key Features:

• Basal body temperature tracking → requires a special thermometer or compatible wearable

• Dual use → for pregnancy planning or non-hormonal contraception

• Subscription model → paid, medically validated

• Privacy protection → GDPR-compliant, emphasizes safeguarding sensitive health data

💡 Why users like it: More than just a cycle tracker – a certified tool for family planning.

5. Period Calendar (Pink Diary)

🌐 iOS | Android

iPhone screenshot of the Period Calendar app: Period prediction, ovulation tracking, pregnancy and fertility options, plus password protection.

This app is simple and playful, making it especially suitable for beginners.

Key Features:

• Colorful design → customizable

• Basic tracking → period, ovulation, fertility

• Reminders → for upcoming periods or pill intake

• Offline use → works without an internet connection

• Free, ad-supported → optional in-app purchases available

💡 Why users like it: Light, straightforward, and visually appealing – particularly good for beginners.

📊 Comparison Table: The 5 Best Period Tracking Apps 2025

App	Highlights	Privacy	Cost	Best for
Clue	Science-based, detailed symptom tracking	GDPR-compliant, no data to ad networks	Freemium (Clue Plus)	Users who value science & privacy
Flo	300M+ downloads, strong community	Privacy-focused, AI predictions	Freemium / Premium	Beginners & community-oriented users
Apple Health	Built into iOS, Apple Watch sync	End-to-end encrypted with iCloud + 2FA	Free	iPhone & Apple Watch users
Natural Cycles	FDA-/CE-approved digital birth control	GDPR-compliant, medically validated	Subscription	Family planning & fertility awareness
Period Calendar	Colorful design, offline use	Ad-supported, optional in-app buys	Free	Beginners wanting simplicity

Why Even the Best Apps Can Be Inaccurate

Predictions rely on historical data. Factors such as stress, travel, illness, medication, or lifestyle changes can alter your cycle. This is why having an additional layer of protection is essential.

More Security in Everyday Life: Period Underwear as a Backup

As practical as period tracking apps are, they can’t deliver 100% accuracy. With allthingsdaysie period underwear, you’ll always be ready for surprises:

• High absorbency (4–6 tampons, up to 12h protection) 🩸

• Seamless & comfortable – perfect for school, work, sports, or travel 😌

• Sustainable & washable – saves money and helps the environment ♻️

💡 Tip: Keep an extra pair of period underwear in your bag or locker, so you’re always protected – even when your cycle shifts unexpectedly.

Discover allthingsdaysie period underwear – your all-round solution for comfort, protection, and peace of mind 🌸

allthingsdaysie Taillenslip Period Underwear: Nahtlos, ohne Silber & Biozide

Buy Now