# kegg vs Chart35

The clearest difference is update cadence: Chart35 at every 6 days against kegg's every 3 weeks. Chart35 also leads on device support (4 vs 2). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

kegg ships an update every 3 weeks, Chart35 every 6 days. The most recent releases landed on September 25, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | kegg | Chart35 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (140 ratings)](https://appshunter.io/ios/app/kegg/id1462248924/reviews)** | — |
| Number of ratings | **140** | — |
| Positive reviews | 76.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Paid | — |
| Size | 52 MB | 5 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Lady Technologies, Inc.](https://appshunter.io/developer/1462248923) | [Stephens Page LLC](https://appshunter.io/developer/6777773686) |

## 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


### Chart35

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

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

**In-app purchases:** none


## Frequently asked questions

### Is kegg free?

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

### Is Chart35 free?

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

### Do kegg or Chart35 have ads?

Neither kegg nor Chart35 shows ads.

### Which is updated more often, kegg or Chart35?

kegg ships an update every 3 weeks, and Chart35 every 6 days. Most recently, kegg was updated on September 25, 2026 and Chart35 on September 19, 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.*