Comparison

Zero vs Period Tracker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Zero

This app helps you manage stress by combining guided breathing exercises with real-time biometric data from your Apple Watch. It provides insights into your stress patterns and helps you schedule recovery moments to build resilience.

Highlights
  • Guided breathing exercises
  • Real-time biometric tracking (RHR, HRV)
  • Stress pattern analysis
  • Scheduled mindful breaks
  • Relaxation validation
  • Local data storage
Features
Read full description

Zero Rush — Your Relaxation Tracker Zero Rush helps you slow down, reset, and understand your stress. Combining guided breathing, real-time biometrics, and relaxation tracking, it gives you measurable insights into how your body responds to stress — so you can take control, not just calm down. Relaxation Tracker Discover what really helps you relax — massage, meditation, music, or silence. Track how your heart rate changes before and after each session to validate what actually works for you. Track Your Stress & Understand Your Patterns With Apple Watch, Zero Rush calculates your stress level using your latest Resting Heart Rate (RHR) and Heart Rate Variability (HRV). See when your stress increases, identify your triggers, and understand your patterns by time of day and day of the week. Breathe Better Use scientifically backed breathing methods like 4-7-8 or Box Breathing to reduce tension and improve focus. Customize your own breathing method and create the perfect rhythm for your daily breaks. Scheduled Breaks Plan your daily recovery moments. Set up smart reminders to take mindful breaks throughout the day, and reconnect with yourself for just a few minutes at a time. Privacy by Design Your data never leaves your device. Everything is stored locally and visible only to you. Zero Rush is not a medical device and does not provide diagnosis or treatment. It is intended for wellness and educational purposes only. Compatible with: iPhone & Apple Watch. Apple Watch unlocks live HRV, resting heart rate, and real-time stress tracking — Zero Rush also works without one. Stop guessing what calms you. Start knowing. Terms of Use: https://www.zero-rush.com/terms-of-use/ Privacy Policy: https://www.zero-rush.com/privacy-policy/ EULA: https://www.zero-rush.com/eula/

About

Period Tracker

Features
Read full description

Period Tracker Ovulation Cycle is your daily companion for understanding your period, ovulation, and fertile window. Combine a period tracker, ovulation calculator, fertility calendar, and symptom diary in one simple app, and turn your daily logs into clear, personalized predictions for the months ahead. Whether you're tracking your menstrual cycle for general wellness, watching for your fertile window while trying to conceive, keeping an eye on PMS and mood patterns, or just want a reliable period calendar and reminder, this app is built to adapt to you. PERSONALIZED CYCLE & OVULATION PREDICTIONS See your next 2 months of cycle phases at a glance, including period days, fertile window, and estimated ovulation date. A short onboarding flow learns your cycle history and physical details so every prediction is tailored specifically to you. Predictions automatically adjust over time as you log more cycles, so your calendar gets smarter the longer you use it. DAILY LOGGING, MADE SIMPLE Log flow intensity, symptoms, mood, water intake, weight, and basal body temperature in just a few taps. Track everything from cramps and headaches to energy levels and sleep, building a daily diary you can look back on. Spot your own patterns over weeks and months, all stored privately on your device. WELLNESS ROUTINES FOR EVERY PHASE Follow multi-day exercise routines paired with calorie tracking, designed around the natural phases of your cycle. Stay active with guided daily routines that fit how your body feels, whether that's a high-energy day or a rest day. PERSONAL INSIGHTS & PDF EXPORT Cycle Insights: review your cycle length trends and fertile window over time, in an easy-to-read summary. Flow Insights: see your flow intensity and bleeding patterns across the last 90 days. Intimacy Insights: track your own patterns during your fertile window, completely at your own pace. User can download a clean, professional PDF summary of their cycle and flow insights to keep or share. A CALENDAR AND REMINDERS THAT WORK FOR YOU Your calendar is built entirely from your own data, updating automatically as you log more days. Get gentle reminders for upcoming periods, fertile windows, and daily logging, so you never lose track. Works fully offline, with your data stored securely on your device for fast, reliable access anywhere. BUILT FOR WOMEN EVERYWHERE Available in multiple languages, with full right-to-left layout support for languages. Designed for every stage, from tracking your very first period to planning a pregnancy or simply staying in tune with your body. WHO IT'S FOR Anyone who wants a straightforward period and ovulation tracker without the clutter. People trying to conceive who want a clear view of their fertile window each month. Anyone managing irregular cycles who wants to start spotting their own patterns. Teens and first-time trackers who want an easy way to learn their own rhythm. Busy women who just want a fast daily log and a calendar that keeps itself updated. YOUR DATA, YOUR CONTROL Your cycle information stays private and is stored securely on your device. We do not sell your personal data to third parties. Period Tracker Ovulation Cycle helps you track and understand your own cycle patterns over time. It does not diagnose or treat any medical condition and is not a substitute for advice from a qualified healthcare professional. Terms of Use: https://period-tracker-ovulation-cycle.tracewavetransparency.com/terms.html Privacy Policy: https://period-tracker-ovulation-cycle.tracewavetransparency.com/privacy.html

Screenshots

Zero4 screens
Period Tracker4 screens

Verdict

The call

Zero and Period Tracker are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Zero sells 3 in-app purchases, starting at $1.99 per month and Period Tracker sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Zero ships an update every 3 weeks, Period Tracker every 2 weeks. The most recent releases landed on October 16, 2026 and October 13, 2026 respectively.

ScorecardNo meaningful differences
Zero versus Period Tracker: the parameters behind the verdict, then further details
ParameterZeroPeriod Tracker
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS18.518.0 — better
Further details — not scored
Size10 MB163 MB
Age rating4+12+
DeveloperCarlos Adiel Vega LopezTraceWave

In-app purchases

3 purchases

Zero

Subscriptions2
  • All Access – Monthly14 Days trial$1.991 Month
  • All Access – Yearly14 Days trial$19.991 Year
One-time1
  • Lifetime All Access$89.99
3 purchases

Period Tracker

Subscriptions3
  • Premium Weekly$2.997 Days
  • Premium Monthly3 Days trial$7.991 Month
  • Premium Yearly7 Days trial$99.991 Year

Questions

Is Zero free?
Zero is free to download, with in-app purchases available.
Is Period Tracker free?
Period Tracker is free to download, with in-app purchases available.
Do Zero or Period Tracker have ads?
Neither Zero nor Period Tracker shows ads.
Which is updated more often, Zero or Period Tracker?
Zero ships an update every 3 weeks, and Period Tracker every 2 weeks. Most recently, Zero was updated on October 16, 2026 and Period Tracker on October 13, 2026.

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