# FEMM Period Ovulation Tracker vs Chart35

The clearest difference is update cadence: Chart35 at every 6 days against FEMM Period Ovulation Tracker's every 4 months. Chart35 also leads on rating (5.0 vs 4.8) and device support (4 vs 2). FEMM Period Ovulation Tracker's advantage is ratings volume (4.1K vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Chart35 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: FEMM Period Ovulation Tracker has 4.1K ratings behind it against 1, so its average is the more settled of the two.

FEMM Period Ovulation Tracker ships an update every 4 months, Chart35 every 6 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | FEMM Period Ovulation Tracker | Chart35 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4.1K ratings)](https://appshunter.io/ios/app/femm-period-ovulation-tracker/id944880989/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chart35/id6784113411/reviews)** |
| Number of ratings | **4.1K** | 1 |
| Positive reviews | 65.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 days** |
| Monetization | Free | Free |
| Size | 27 MB | 5 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [FEMM Foundation](https://appshunter.io/developer/944880988) | [Stephens Page LLC](https://appshunter.io/developer/6777773686) |

## What reviewers say

### FEMM Period Ovulation Tracker

[App page](https://appshunter.io/ios/app/femm-period-ovulation-tracker/id944880989)

This app helps women track their menstrual cycles, symptoms, and hormonal health. It offers detailed insights, charting tools, and access to a network of healthcare professionals for personalized care.

**Highlights:** Cycle and period tracking, Symptom tracking (physical and emotional), Daily data input reminders, Cycle pattern charting, Medication tracking, Doctor-shareable charts, Hormone knowledge base

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💻 User-friendly interface
- 🔍 Detailed cycle tracking
- 🧠 Informative health insights
- 🤝 Helpful for natural family planning
- 🙌 Empowering for women's health

**What reviewers complain about**

- 🐛 Glitches and bugs with recent updates
- 🕰️ Redundant date/cycle prompts
- 🤔 Limited customization options
- 🔍 Lack of export/sharing features
- 🤷‍♀️ Confusing navigation at times

**Reported bugs**

- App crashes on opening after iOS updates
- Date/cycle tracking gets mixed up or stuck
- Symptom/observation data not saving properly
- Analysis/charting features not functioning as expected

**Requested features**

- Add option to track seminal fluid observations
- Integrate with Apple Health for seamless data sync
- Expand mood/emotion tracking options
- Improve date/cycle navigation and data entry
- Provide better postpartum/breastfeeding support


### Chart35

[App page](https://appshunter.io/ios/app/chart35/id6784113411)

This app helps users privately track their fertility observations using the Creighton Model FertilityCare System. It offers offline functionality, color-coded stamps, and various chart views. Users can securely share their data with practitioners.

**Highlights:** Creighton Model charting, Offline-first functionality, Color-coded observation stamps, Chart and calendar views, Peak day and post-peak tracking, Secure practitioner sharing

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FEMM Period Ovulation Tracker free?

FEMM Period Ovulation Tracker is free to download, with no in-app purchases.

### Is Chart35 free?

Chart35 is free to download, with no in-app purchases.

### Which has better reviews, FEMM Period Ovulation Tracker or Chart35?

Chart35 is rated higher. FEMM Period Ovulation Tracker averages 4.8 out of 5 from 4.1K ratings, while Chart35 averages 5.0 from 1 ratings.

### Do FEMM Period Ovulation Tracker or Chart35 have ads?

Neither FEMM Period Ovulation Tracker nor Chart35 shows ads.

### Which is updated more often, FEMM Period Ovulation Tracker or Chart35?

FEMM Period Ovulation Tracker ships an update every 4 months, and Chart35 every 6 days. Most recently, FEMM Period Ovulation Tracker was updated on November 1, 2026 and Chart35 on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*