Safr - Know Your Chances
Grow Labs LLC Health & Fitness In-app purchases
Track your cycle, know your fertile days, and understand your pregnancy risk.
- Downloads
- 3.4K+
- on Google Play
- Price
- Free
- In-app purchases
- Updated
- Jul 19
- 2026 · v1.5.1
Screenshots
About Safr - Know Your Chances
Most apps rely on averages. Your body doesn't. Safr uses the data you log to give you clear, personalized insight into your fertility and pregnancy risk.
How Safr Works:
1. We use real science (and real data).
Safr is based on established research from the Mayo Clinic, Cleveland Clinic, and leading reproductive health studies. Your cycle follows biological patterns; we use advanced data integration to understand yours.
To estimate your fertility and pregnancy risk, Safr analyzes:
- Basal Body Temperature (BBT): Connect your Oura Ring to sync nightly temperature trends and identify thermal shifts.
- LH Test Strip Logging: Log your luteinizing hormone (LH) results directly to pinpoint your peak fertility window.
- Cervical Mucus Analysis: Use our guided tools to track this key biological indicator for a complete picture of your fertile days.
- Cycle History & Symptoms: We adapt to your unique patterns, not a fixed calendar.
2. Know your pregnancy risk every day.
Safr gives you daily fertility probabilities and clear risk levels so you always know where you stand. Unlike other period tracking apps, Safr allows you to log Plan B (emergency contraception) and multiple types of intercourse (protected, unprotected, or withdrawal) to ensure your risk assessment is as accurate as possible.
3. A smarter way to check pregnancy likelihood.
Safr's virtual pregnancy test uses your cycle timing, BBT trends, and LH data to estimate your chances of being pregnant. Our algorithm combines these inputs to generate a structured, data-driven likelihood.
A subscription is required to unlock the full power of Safr, including:
- Advanced Integrations: Oura Ring BBT syncing.
- Enhanced Tracking: LH test strip logging, cervical mucus analysis, and comprehensive intercourse logs.
- Predictive Insights: Personalized fertility probabilities and cycle reports.
- Virtual Pregnancy Test & AI Health Assistant.
Terms of Use: https://safr.growlabsllc.com/terms
Privacy Policy: https://safr.growlabsllc.com/privacy
Disclaimer: Safr does not provide medical advice. All insights are based on established scientific research and fertility awareness methods. Always consult a healthcare provider for medical guidance.
How Safr Works:
1. We use real science (and real data).
Safr is based on established research from the Mayo Clinic, Cleveland Clinic, and leading reproductive health studies. Your cycle follows biological patterns; we use advanced data integration to understand yours.
To estimate your fertility and pregnancy risk, Safr analyzes:
- Basal Body Temperature (BBT): Connect your Oura Ring to sync nightly temperature trends and identify thermal shifts.
- LH Test Strip Logging: Log your luteinizing hormone (LH) results directly to pinpoint your peak fertility window.
- Cervical Mucus Analysis: Use our guided tools to track this key biological indicator for a complete picture of your fertile days.
- Cycle History & Symptoms: We adapt to your unique patterns, not a fixed calendar.
2. Know your pregnancy risk every day.
Safr gives you daily fertility probabilities and clear risk levels so you always know where you stand. Unlike other period tracking apps, Safr allows you to log Plan B (emergency contraception) and multiple types of intercourse (protected, unprotected, or withdrawal) to ensure your risk assessment is as accurate as possible.
3. A smarter way to check pregnancy likelihood.
Safr's virtual pregnancy test uses your cycle timing, BBT trends, and LH data to estimate your chances of being pregnant. Our algorithm combines these inputs to generate a structured, data-driven likelihood.
A subscription is required to unlock the full power of Safr, including:
- Advanced Integrations: Oura Ring BBT syncing.
- Enhanced Tracking: LH test strip logging, cervical mucus analysis, and comprehensive intercourse logs.
- Predictive Insights: Personalized fertility probabilities and cycle reports.
- Virtual Pregnancy Test & AI Health Assistant.
Terms of Use: https://safr.growlabsllc.com/terms
Privacy Policy: https://safr.growlabsllc.com/privacy
Disclaimer: Safr does not provide medical advice. All insights are based on established scientific research and fertility awareness methods. Always consult a healthcare provider for medical guidance.
What’s new
Version 1.5.1 · Updated July 19, 2026
Welcome to Safr, your private period and cycle tracker. Log your period, symptoms, and cervical mucus in seconds. See your cycle predictions and fertile window at a glance, get daily insights based on what you log, and ask the Health Assistant anything about your cycle. Your data stays on your device.
Alternatives to Safr - Know Your Chances
Looking for apps like Safr - Know Your Chances? Here are 6 similar Android apps on Google Play. The highest rated is Femometer - Fertility Tracker (4.8/5), and all 6 are free to download.
-
HeiaHeia 4.2
-
Femometer - Fertility Tracker 4.8
-
MyNeuron
-
Fertility Friend Ovulation App 4.5
-
VEDIC LAB: Science of Wellness
-
Moonly - Track Period & Cycle 4.4
| App | Rating | Price | Installs | Last updated | Compare |
|---|---|---|---|---|---|
| Safr - Know Your Chances | – | Free | 1,000+ | Jul 19, 2026 | |
| HeiaHeia | 4.2 / 5 | Free | 100,000+ | Oct 28, 2026 | Compare |
| Femometer - Fertility Tracker | 4.8 / 5 | Free | 1,000,000+ | Sep 14, 2024 | Compare |
| MyNeuron | – | Free | 50,000+ | Oct 19, 2026 | Compare |
| Fertility Friend Ovulation App | 4.5 / 5 | Free | 1,000,000+ | Nov 4, 2026 | Compare |
| VEDIC LAB: Science of Wellness | – | Free | 1,000+ | Jun 18, 2026 | Compare |
| Moonly - Track Period & Cycle | 4.4 / 5 | Free | 5,000+ | Sep 14, 2026 | Compare |