# kegg vs Period

The clearest difference is rating: Period at 4.9 against kegg's 3.9. Period also leads on monetization model (free vs paid) and ratings volume (2.8K vs 144). kegg's advantage is review sentiment (75% vs 54%). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Period holds the better App Store score, 4.9 against 3.9. That said, the two scores are not equally well evidenced: Period has 2.8K ratings behind it against 144, so its average is the more settled of the two. Written reviews complicate that: 75% of kegg's written reviews are positive against 54% of Period's, so the app with the better star average is not the one people write more warmly about.

kegg ships an update every 3 weeks, Period monthly. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | kegg | Period |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (144 ratings)](https://appshunter.io/ios/app/kegg/id1462248924/reviews) | **[4.9 (2.8K ratings)](https://appshunter.io/ios/app/period-tracker/id6480586681/reviews)** |
| Number of ratings | 144 | **2.8K** |
| Positive reviews | **75.2% of reviews** | 53.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Paid | **Free** |
| Size | 52 MB | 56 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Lady Technologies, Inc.](https://appshunter.io/developer/1462248923) | [SPD Development Company Ltd](https://appshunter.io/developer/976408511) |

## What reviewers say

### kegg

[App page](https://appshunter.io/ios/app/kegg/id1462248924)

This medical-grade device offers accurate fertility tracking by analyzing cervical fluid in just two minutes daily. It helps identify fertile windows for conception and provides insights into ovulation, while also offering guided pelvic floor exercises for health and recovery.

**Highlights:** Medical-grade fertility tracking, Cervical fluid analysis, Fertile window identification, Ovulation probability insights, Guided kegel exercises, Pelvic floor health optimization

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 💡 Provides insights into cycle
- 👍 Helpful community support
- 🚀 Convenient daily tracking
- 🚀 Accurate fertility predictions

**What reviewers complain about**

- 🐛 Buggy app with poor navigation
- 🐛 Inconsistent fertility predictions
- 🐛 Difficult to interpret data
- 🐛 Frequent login issues
- 🐛 Notifications don't always work

**Reported bugs**

- App freezes and crashes frequently
- Syncing issues between device and app
- Fertility predictions do not align with other methods
- Constant logout prompts disrupt user experience

**Requested features**

- Add ability to track period and symptoms
- Improve app design and user experience
- Provide more detailed data analysis and insights
- Integrate with other fertility tracking apps


### Period

[App page](https://appshunter.io/ios/app/period-tracker/id6480586681)

Track your menstrual cycle, log period dates, ovulation test results, and symptoms. Gain insights into fertility probability based on your cycle length. This app helps predict periods and monitor cycles.

**Highlights:** Menstrual cycle tracking, Period logging, Ovulation test logging, Symptom tracking, Fertility probability insights, Cycle length comparison

**In-app purchases:** none

**What reviewers like**

- 👍 Accurate tracking
- 🚀 Easy to use
- 💡 Helpful for fertility tracking

**What reviewers complain about**

- 🐛 Notifications not working as expected
- 🐛 Data loss after updates
- 🐛 Broken links in the app
- 💡 No option to log basal body temperature

**Reported bugs**

- Dates and data getting changed after updates
- Calendar not populating after updates
- Whole calendar getting erased after updates

**Requested features**

- Add option to log basal body temperature
- Improve notification customization


## Frequently asked questions

### Is kegg free?

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

### Is Period free?

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

### Which has better reviews, kegg or Period?

Period is rated higher. kegg averages 3.9 out of 5 from 144 ratings, while Period averages 4.9 from 2.8K ratings.

### Do kegg or Period have ads?

Neither kegg nor Period shows ads.

### Which is updated more often, kegg or Period?

kegg ships an update every 3 weeks, and Period monthly. Most recently, kegg was updated on October 29, 2026 and Period on October 30, 2026.

---

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