# cycle.log vs KernelHairs

The clearest difference is in-app purchases: KernelHairs at none against cycle.log's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. cycle.log sells 3 one-off in-app purchases. KernelHairs asks for nothing beyond the download.

cycle.log ships an update every 2 months, KernelHairs every 3 months. The most recent releases landed on September 30, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | cycle.log | KernelHairs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (25 ratings)](https://appshunter.io/ios/app/cyclelog/id1141567309/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 23 MB | 44 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 12+ |
| Developer | [433 Labs](https://appshunter.io/developer/423129678) | [徐州科诺医疗仪器设备有限公司](https://appshunter.io/developer/1281841881) |

## What reviewers say

### cycle.log

[App page](https://appshunter.io/ios/app/cyclelog/id1141567309)

This app simplifies tracking your menstrual cycles and predicting your next period. It learns from your logged cycles to provide increasingly accurate estimates and reminders. The more you use it, the smarter its predictions become.

**Highlights:** Simple cycle logging, Next period prediction, Automated cycle length adjustment, Cycle length standard deviation calculation, Period reminders

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |


### KernelHairs

[App page](https://appshunter.io/ios/app/kernelhairs/id1446514350)

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

**In-app purchases:** none


## Frequently asked questions

### Is cycle.log free?

cycle.log is free to download, with in-app purchases available.

### Is KernelHairs free?

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

### Do cycle.log or KernelHairs have ads?

Neither cycle.log nor KernelHairs shows ads.

### Which is updated more often, cycle.log or KernelHairs?

cycle.log ships an update every 2 months, and KernelHairs every 3 months. Most recently, cycle.log was updated on September 30, 2026 and KernelHairs on September 25, 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.*