# cycle.log — simple menstrual cycle logging

> Simple menstrual cycle logging and prediction app. (iPhone/iPad app by 433 Labs.)

- Source: https://appshunter.io/ios/app/cyclelog/id1141567309 (this page in markdown: same URL + `.md`)
- Developer: [433 Labs](https://appshunter.io/developer/423129678)
- Category: Medical, Health & Fitness
- Price: Free with in-app purchases
- Rating: 4.52/5 from 25 App Store ratings · 3 written reviews indexed
- Age rating: 12+
- Requires: iOS 13.0 · 23 MB
- Languages: English
- Released: 2017-04-15
- Data updated: 2026-08-15
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/cyclelog/id1141567309/reviews.md

## What is cycle.log?

cycle.log is not "yet another period tracker." Unlike other menstrual cycle trackers, cycle.log makes is extremely simple to log your cycles and see when your next period is going to start.

Not only is it easy to log your cycles, but cycle.log will also send you a friendly reminder before your next period so you can be prepared.

The more you use cycle.log the smarter it becomes. Every time you log a cycle the app automatically adjusts your average cycle length and uses that to estimate your next period. It also calculates the standard deviation of your cycle length which tells you how different your cycles are from one another.

Please give cycle.log a try and be sure to tell your friends!

## Key features

- Simple cycle logging
- Next period prediction
- Automated cycle length adjustment
- Cycle length standard deviation calculation
- Period reminders

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/cyclelog/id1141567309/reviews.md

### 5/5 — The best PRIVATE cycle tracking app.

*2025-02-09*

This app works great, is simple to use, and most importantly, it collects no data from us.

### 5/5 — Best Tracker I’ve found

*2022-09-12*

I’ve been tracking my period on the same website for almost 12 years and unfortunately it is shutting down. I’ve downloaded a lot of apps trying to find something that was similar to the website I was using and this has been the closest! 

I uploaded a few months of previous data and the estimated cycle durations and standard deviation changed as it should unlike many of the other apps I’ve tried. I love that all the way information I need is easy to see all on one page, such as next predicted period, next predicted ovulation, cycle length, standard deviation, last cycle date, and what cycle day I’m on. I also like being able to see how long each cycle is which is easy to view at a glance in the log. 

Improvements that would make me love this app even more would be: Next to the dates, add in parentheses how many days until or ago something was. For example Next Ovulation Friday, September 23 (12 days away) or Last Period Sunday, September 4 (7 days ago). I didn’t realize how helpful this was in my old website until I didn’t have it anymore. I’d also like to be able to make simple notes. I track ovulation so being able to note in the log what date it happened is helpful. 

 I love how simple and basic this app is. It doesn’t ask me to track one million symptoms, no ads, no unnecessary fluff. And one of my favorite things is that it doesn’t ask me how many days my bleeding lasts! I never keep track of all that extra stuff. I only want to know when each cycle starts, estimated ovulation, what cycle day I’m on, and on average how long are my cycles.

**Developer response:** Hi! Thank you so much for this wonderful review! We are so happy that you enjoy using our app. And thank you for the suggestion! That is an excellent idea to show the relative time next to the dates. We'll look at adding that in our next release.

### 5/5 — AA

*2021-12-16*

Oka

## Frequently asked questions about cycle.log

### What is cycle.log?

cycle.log is a medical app designed for simple menstrual cycle logging and prediction. It helps users track their cycles and estimate when their next period will start.

### How does cycle.log predict my next period?

cycle.log learns from your logged cycles to automatically adjust your average cycle length and uses this data to estimate your next period. It also calculates the standard deviation of your cycle length.

### Does cycle.log send reminders?

Yes, cycle.log sends friendly reminders before your next period, helping you to be prepared.

### What devices does cycle.log support?

cycle.log is available for iPhone and iPod devices.

### What is the age rating for cycle.log?

cycle.log has an age rating of 12+.

### How often is cycle.log updated?

The latest version of cycle.log is 1.4, and it was last updated on June 27, 2022.

### Is cycle.log ad-free?

Yes, cycle.log is ad-free.

### What is the user rating for cycle.log?

cycle.log has a rating of 4.5 stars from 25 ratings.

## Version history (last 5 releases)

### 1.4 — 2022-06-27

• Dark mode support
• cycle.log is now completely ad-free

Thanks for using cycle.log! If you like it please consider giving us a rating and don't forget to tell your friends!

### 1.3 — 2018-05-30

This app has been updated by Apple to display the Apple Watch app icon.

In this version of cycle.log...
+ The dashboard is easier to use
+ Previously logged cycles can be edited

Thanks for using cycle.log! If you like it please consider giving us a rating and don't forget to tell your friends!

### 1.2.1 — 2017-11-05

+ Support for iPhone X

v1.2
Better notifications!
+ The upcoming period notification now uses the standard deviation of your cycles to determine the best time to send you a reminder.
+ Log cycles directly from a notification without opening the app.

### 1.2 — 2017-07-29

Better notifications!
+ The upcoming period notification now uses the standard deviation of your cycles to determine the best time to send you a reminder.
+ Log cycles directly from a notification without opening the app.

### 1.1.2 — 2017-06-08

Oops! In the last update we introduced a bug on the dashboard when your period is only 1 day away. This is now fixed :-)

Previously in version 1.1...

Fertility info!
+ The app now displays basic fertility information such as when you are most fertile and the estimated date of your next ovulation. If you'd rather not see this information it can be turned off in the app settings.

Advanced statistics!
+ The standard deviation of your cycle length is now displayed on the dashboard. This number tells you how close your cycles are to the average and how accurately the app can predict your next cycle.

#StandWithPP
+ Show your support for Planned Parenthood directly from the app.

## Apps similar to cycle.log

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Fertility & Period Tracker •](https://appshunter.io/ios/app/fertility-and-period-tracker/id961168994) | 4.6 (287) | Free | Medical |

## More apps by 433 Labs

- [status.log](https://appshunter.io/ios/app/statuslog/id6444921793)

All apps by 433 Labs: https://appshunter.io/developer/423129678

## Related topics

[433 labs](https://appshunter.io/ios/topics/433-labs)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*