Tempdrop vs Sympto Stars
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tempdrop
This app works with a specialized thermometer to track subtle overnight temperature changes. It helps identify hormonal fluctuations throughout the menstrual cycle, pinpoint ovulation, and predict cycle phases. The data supports fertility awareness and cycle tracking.
- Basal body temperature tracking
- Ovulation pinpointing
- Menstrual cycle prediction
- Hormonal fluctuation correlation
- Fertility awareness support
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The Tempdrop app is designed to complement the Tempdrop device - a personalized user-specific thermometer that captures minute temperature variations throughout the night to pinpoint the basal body temperature. Detected variations in temperature correlate with hormonal fluctuations throughout the menstrual cycle. When used with the Tempdrop device, this app can help users to pinpoint ovulation and effectively track and predict the varying phases of the cycle. Disclaimer: The Tempdrop sensor and app are intended as complementary instruments to enhance your ability to monitor your fertility and share health details. The app and its wearable sensor, in themselves, are not, nor are they intended to be, a fertility monitor, a substitute for contraception, or a birth control method. We recognize the need of some to use the data and information provided to support ongoing health and menstrual cycle tracking, however, it is important to note that this should NOT be used as a substitute for an in-presence qualified professional, medical analysis, advice, guidance, or treatment. We strongly advise seeking a qualified Fertility Awareness instructor or other self-teaching resources to learn a symptothermal method and support your fertility journey. The provided interpretations and prediction guidelines are not suitable for use with irregular cycles. Optimal performance is dependent on correct and consistent use. Individual usage, wearing, input, and circumstances can affect the data. The user is fully responsible for the individual data inputs. The Tempdrop Sensor is approved for use in the USA, and is registered in the FDA database under registration number 3016099071. The device is classified as "Device, Fertility Diagnostic, Proceptive”. A link to the terms of use - https://www.tempdrop.com/pages/tos A link to the privacy policy - https://www.tempdrop.com/pages/privacy-policy
Sympto Stars
This app helps users track their fertility status in real-time by interpreting biomarkers like temperature and cervical mucus. It offers modes for various cycle situations and provides instructional guidance for users of all skill levels. Users can also access printable cycle charts and receive a certificate of competence after training.
- Real-time fertility status display
- Biomarker interpretation (temperature, cervical mucus)
- Modes for pregnancy, breastfeeding, perimenopause
- Pilot and Expert modes for guided learning
- Printable cyclograph PDF function
- Certificate of competence in cycle literacy
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Sympto Stars, the premium successor app to Sympto Free. 30-day trial period free of charge, including 15 days of personal advice. Created by the Swiss SymptoTherm Foundation, sympto® integrates the sympto® School consisting of an international team of certified instructors, a virtual training platform, and the app Sympto Stars that displays your fertility status in real time by interpreting your biomarkers. Sympto Stars assesses your fertility status by correlating your estrogen marker and your progesterone marker (cervical mucus and temperature) and does not rely on problematic predictive algorithms. When you register for your account, you receive 15 days of free personal guidance by a natural family planning instructor. Later you can choose a supscription for future months of additional instruction. You have the option to purchase the app without any instruction. - Sympto Stars offers modes for different cycle situations: pregnancy, breastfeeding and perimenopause. - A Pilot mode option guides you through your first cycle with instructional prompts every step of the way. This can be switched to Expert mode when you are more advanced in your skills, after you complete your training. - Easy-to-use icons that represent your cervical fluid observations in categories relevant to your fertility status. - Billings- or Temperature-only modes can be activated to bridge difficult cycles.. - Qualified instructors in a number of languages - Complete instructional text available in several languages - Printable cyclograph PDF function - After a 6-month training you receive a certificate of competence in cycle literacy - Display of moon phases and basic smileys help you see yourself in harmony with the universe Information about purchasing the app: - In order to use the app, you must purchase a subscription. - The first 30 days are free of charge after which your selected subscription will be charged to your account. - You must register your account and confirm your email address in order to use the app - Your subscription automatically renews monthly, biannually or yearly depending on the subscription you select, according to App Store policy. - You can cancel the automatic renewal of your subscription in your iTunes account. - Subscriptions are non-refundable. - The advice products available in the shop on sympto.ch are of a voluntary nature and are not necessary for the use/function of the APP. The consulting services are only available via the website and not in the app. The subscription includes a 30-day trial period, including 15 days of instruction. Renews itself automatically. A valid subscription grants you access to all premium features such as the entire PDF cycle chart, message box, introduction video and the Symptothermal Manual. The subscription does not include any counseling services. - You can find our Privacy Policy and our our Terms of Use here: https://sympto.org/3/en/terms-and-conditions
Screenshots
Verdict
The clearest difference is review sentiment: Sympto Stars at 87% against Tempdrop's 39%. Sympto Stars also leads on rating (5.0 vs 4.2) and iOS requirement (11.0 vs 15.0). Tempdrop's advantage is monetization model (free with in-app purchases vs subscription) and ratings volume (714 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Tempdrop sells 6 in-app purchases, starting at $2.99 per month and Sympto Stars sells 3 in-app purchases, starting at $6.49 per month. Whichever you choose, the download price is not the number that matters.
Sympto Stars holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Tempdrop has 714 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 39% of Tempdrop's written reviews are positive against 87% of Sympto Stars's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | Tempdrop | Sympto Stars |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (714 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 38.7% of reviews | 86.7% of reviews — better |
| Number of ratings | 714 — better | 1 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 107 MB | 68 MB |
| Age rating | 17+ | 4+ |
| Developer | Tempdrop Inc | Ronald Harri Wettstein |
Customer experience
Tempdrop
Sympto Stars
Bugs and requests
Tempdrop
Reported bugs
4 issues- App crashes and freezes
- Issues with syncing device data
- Inaccurate cycle predictions and phase tracking
- Temperature data changes over time
Requested features
5 requests- Improved sleep tracking capabilities
- More customizable symptom and data tracking
- Ability to manually confirm ovulation
- Integration with other fertility/health apps
- Support for irregular cycles and postpartum/breastfeeding phases
Sympto Stars
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Tempdrop
- Tempdrop Promo Premium monthly2 Months trial$2.991 Month
- Tempdrop Premium monthly2 Months trial$6.001 Month
- Tempdrop Promo Premium quarterly2 Months trial$7.993 Months
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- Tempdrop Premium quarterly2 Months trial$15.003 Months
- Tempdrop Promo Premium yearly2 Months trial$24.991 Year
- Tempdrop Premium yearly*2 Months trial$48.001 Year
Sympto Stars
- monthly subscription1 Month trial$6.491 Month
- 6 month subscription1 Month trial$34.996 Months
- annual subscription1 Month trial$60.991 Year
Questions
Is Tempdrop free?
Is Sympto Stars free?
Which has better reviews, Tempdrop or Sympto Stars?
Do Tempdrop or Sympto Stars have ads?
Which is updated more often, Tempdrop or Sympto Stars?
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