Comparison

INER Cycle vs Sympto

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

Head to head
About

INER Cycle

Features
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Download and try the INER Cycle application! The app gives you a possibility to note biological signs of the fertility during daily observations of a basal body temperature and a cervical mucus. Now you can do this in a convenient way! You can consult your observations with experienced teacher who will show you how to determine the fertility and infertility days in your cycle. What is important – all data are confidential and will not be shared with any other organization.  INER Cycle is the authorized tool of the Institute of Natural conception regulation Dr. med. Josef Rötzer – INER International and INER Poland - that teach the first all over the world modern and natural fertility awareness method developed by prof. Josef Rötzer. You are very welcome to participate in the course of this method with INER’ teacher (www.iner.org, www.iner.pl) or read the book: „Natural Conception Regulation” of prof. Josef Rötzer. Noting the body temperature measurements and cervical mucus observations and interpreting these signs you can indicate fertility and infertility days with great precision. INER Cycle is consistent with the nature, ecological, without limitations to creation and access to the cycle cards.  Try INER Cycle for free during 90 days!   The app may be helpful to: - monitoring woman’s fertility and health condition - reliably determine the best time to a child conception - increase a chance to conception (also for couples with a weaken fertility) - avoid pregnancy, even with 100% reliability - interpret cycle card whith a certified INER’ teacher App functions:

- storing the data in a cloud storage – the possibility to sign in different equipment with automatic synchronization, working offline (until the account in the system is active) - possibility to share the cycle card to interpretation for someone (for example husband) – free observator account - possibility to interpret the observations according to prof. Rötzer standardized card and signs - internet courses organizing possibility - printing cards - consulting cycle cards with INER’ teacher - many signs observations, your own notes - advanced chart showing temperature and fertility signs - context support - statistics - password protection - possibility to download the chart with interpretation in PDF version - languages: English, German, Polish   You can choose Observer or User account: Observer (for example husband) – may look through and interpret cycle cards that he has shared. The Observer account is for free.  User – has the possibility to insert and interpret observations. The user account is for free during first 90 days. After free trial period, the using of the system is payable 29,99 PLN for 1 year. The subscription payment is dedicated for INER Cycle maintenance and development. Before starting to use the app it is recommended to:  - read the instruction for prof.  Rötzer method http://iner.pl/metoda-rotzera/  - read the books about prof. Rötzer method (you can buy them in INER online shop) https://sklep.iner.pl/   - take part in the sympto-thermal method of prof. Rötzer course http://iner.pl/kursy/

About

Sympto

Features
Read full description

Sympto is a menstrual cycle journal for basal body temperature, cervical mucus, bleeding and personal notes. Keep your observations together and explore them on a clear cycle chart. No account required. LEARN BY DOING The interactive tour highlights real controls and guides you through recording temperature, adding an observation and opening your chart. Practise with separate sample data. Skip the tour whenever you like, or start it again in Settings. DAILY OBSERVATIONS • Record temperature, measurement time and disturbances. • Note mucus characteristics and sensations separately. • Add optional cervix observations, bleeding and intercourse entries. • Write notes in your own words. YOUR CYCLE CHART Switch between the mobile chart and the full cycle sheet. Review previous cycles and add your own markings. Set a reminder for your daily temperature measurement. YOUR DATA, YOUR COPY Your observations are stored on your device. Save your chart as a PDF to view or print. Save a data backup in a location you choose, then restore it on another phone. A backup is a separate file and does not update automatically. CSV export and JSON format details are available under Advanced options. MAKE IT YOURS Use Sympto in English, German, French or Polish. Choose your date format, 12/24-hour clock and °C or °F separately. Switch between light and dark themes. Sympto is a recording tool. It does not automatically interpret fertility or predict ovulation. Selecting an observation method saves a preference; it does not apply that method’s rules to your chart. Interpret observations yourself according to the method you have learned. The app does not replace medical advice or guidance from a qualified fertility awareness instructor.

Screenshots

INER Cycle3 screens
Sympto4 screens

Verdict

The call

The clearest difference is update cadence: Sympto at fortnightly against INER Cycle's every 3 months. INER Cycle's advantage is iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

INER Cycle ships an update every 3 months, Sympto fortnightly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 4 level
INER Cycle versus Sympto: the parameters behind the verdict, then further details
ParameterINER CycleSympto
PriceFreeFree
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.0 — better13.0
Further details — not scored
Size8 MB29 MB
Age rating12+4+
DeveloperInstytut Naturalnego Planowania RodzinyJakub Zajaczkowski

In-app purchases

None

INER Cycle

No in-app purchases

None

Sympto

No in-app purchases

Questions

Is INER Cycle free?
INER Cycle is free to download, with no in-app purchases.
Is Sympto free?
Sympto is free to download, with no in-app purchases.
Do INER Cycle or Sympto have ads?
Neither INER Cycle nor Sympto shows ads.
Which is updated more often, INER Cycle or Sympto?
INER Cycle ships an update every 3 months, and Sympto fortnightly. Most recently, INER Cycle was updated on November 2, 2026 and Sympto on October 31, 2026.

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