Best Basal Body Temperature Tracker Free Apps

248+ iOS apps curated and reviewed

4.1 avg rating
20 free apps
Updated September 2026

Every iPhone needs a few good basal body temperature tracker free apps. We benchmark 248+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Basal Body Temperature Tracker Free Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Natural Cycles: Fertility AppNatural Cycles: Fertility AppFree4.8★ (30K)YesYesSep 2026
2Body Temperature App For FeverBody Temperature App For FeverFree4.7★ (22K)NoYesSep 2026
3Femometer Fertility TrackerFemometer Fertility TrackerFree4.9★ (70K)NoYesSep 2026
4Ovia Cycle & Pregnancy TrackerOvia Cycle & Pregnancy TrackerFree4.8★ (90K)NoNoSep 2026
5Fever Thermometer | Body TempFever Thermometer | Body TempFree4.3★ (257)YesYesSep 2026
6Body Temperature TrackerBody Temperature TrackerFree1.0★ (1)NoYesSep 2026
7Musa: Period & PregnancyMusa: Period & PregnancyFree4.8★ (11K)YesYesSep 2026
8Body Temperature AppBody Temperature AppFree4.2★ (230)YesNoSep 2026

Top Picks for Basal Body Temperature Tracker Free

Natural Cycles: Fertility App#1

Natural Cycles: Fertility App by NaturalCycles Nordic AB

Ovulation Tracker・FDA-cleared
Editor's Choice
💪 Health & Fitness
4.8😊(30K ratings)
FreeAdsIn-App Purchases
#34in Health & Fitness
Natural Cycles: Fertility App screenshot 1
Natural Cycles: Fertility App screenshot 2
Natural Cycles: Fertility App screenshot 3
Natural Cycles: Fertility App screenshot 4
Natural Cycles: Fertility App screenshot 5
Natural Cycles: Fertility App screenshot 6

This app helps women track their hormonal health and fertility using body temperature data. It offers hormone-free contraception, pregnancy planning, and insights into various cycle stages. It adapts to individual cycles, even irregular ones, providing daily fertility status.

What We Love

  • 👍 Teaches users about their cycle
  • 👍 Helps users understand their body
  • 👍 Provides a natural contraceptive option
  • 👍 Accurate in predicting ovulation and periods
  • 👍 Empowers users to take control of their fertility
  • 👍 Improves mood and reduces side effects compared to hormonal birth control
  • 👍 Useful for both preventing and planning pregnancy
  • 👍 Detailed data and insights about user's cycle

Room to Improve

  • 🐛 Inconsistent in predicting ovulation and periods for some users
  • 🐛 Thermometer issues (loud, hard to read, no Bluetooth connectivity)
  • 🐛 Difficult to use for users with irregular cycles or disrupted sleep schedules
  • 🐛 Lack of customer support responsiveness
  • 🐛 Automatic subscription renewal issues and no refunds
  • 🐛 Algorithm not always accurate, leading to unintended pregnancies
  • 🐛 Cluttered and unintuitive app interface
Body Temperature App For Fever#2

Body Temperature App For Fever by AboutMe Apps, Inc.

Thermometer. Checker. Tracker
Strong Contender
🏥 Medical
4.7😞(22K ratings)
FreeIn-App Purchases
#17in Medical
Body Temperature App For Fever screenshot 1
Body Temperature App For Fever screenshot 2
Body Temperature App For Fever screenshot 3
Body Temperature App For Fever screenshot 4
Body Temperature App For Fever screenshot 5
Body Temperature App For Fever screenshot 6

Estimate and track body temperature trends to monitor potential fever symptoms. Log data, export reports for healthcare providers, and monitor family members' temperatures. Includes features like heart rate estimation and symptom tracking.

What We Love

  • ⭐ Accurate temperature readings
  • 📊 Helpful for tracking health symptoms
  • 🔍 Useful when no thermometer is available

Room to Improve

  • 💰 Subscription-based model
  • 🤔 Misleading claims about temperature measurement
  • 🤖 Inaccurate temperature estimates
  • 🔒 Lack of transparency around subscription details
Femometer Fertility Tracker#3

Femometer Fertility Tracker by Bongmi Global Group

Ovulation & Period Calendar
Worth Considering
💪 Health & Fitness
4.9😊(70K ratings)
FreeIn-App Purchases
Femometer Fertility Tracker screenshot 1
Femometer Fertility Tracker screenshot 2
Femometer Fertility Tracker screenshot 3
Femometer Fertility Tracker screenshot 4
Femometer Fertility Tracker screenshot 5
Femometer Fertility Tracker screenshot 6

This app helps women track their menstrual cycles, predict ovulation, and monitor fertility. It records period dates, symptoms, and test results to provide personalized insights and increase conception rates. It also supports users throughout pregnancy with tracking and educational resources.

What We Love

  • 🚀 Reliable and accurate predictions
  • 👍 Customizable and helpful features
  • 💡 Intelligent LH test recognition
  • 👍 Great for tracking cycles and ovulation

Room to Improve

  • 🐛 Syncing and connectivity issues
  • 🔍 Limited fertility factor tracking
  • 💬 Overwhelming community discussions
  • 💰 Paywall for key features

More Basal Body Temperature Tracker Free apps to explore

FAQ about Basal Body Temperature Tracker Free

What are the best basal body temperature tracker free apps for iPhone?
Natural Cycles: Fertility App tops our basal body temperature tracker free apps ranking as of September 2026, with a 4.8-star average from 30K App Store ratings, and it's free to download.
Natural Cycles: Fertility App shows ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 248+ basal body temperature tracker free apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
The app uses your body temperature to track ovulation, helping you identify fertile days for preventing or planning pregnancy. It offers a hormone-free contraception method and provides insights into different stages of your reproductive health, including postpartum and perimenopause.
The app is scientifically proven to be 93% effective with typical use and 98% effective with perfect use. It's important to note that no birth control method is 100% effective, and it does not protect against STIs.