# Period Diary: Flow & Ovulation — Private Ovulation Calendar Log

> Simple, private menstrual cycle, ovulation, and fertility tracker with predictive insights. (iPhone/iPad app by Sasa Kolda.)

- Source: https://appshunter.io/ios/app/period-diary-flow-and-ovulation/id1021545958 (this page in markdown: same URL + `.md`)
- Developer: [Sasa Kolda](https://appshunter.io/developer/1673557983)
- Category: Health & Fitness, Medical
- Price: Free with in-app purchases
- Rating: 4.10/5 from 429 App Store ratings · 66 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.4 · 92 MB
- Languages: American English
- Released: 2015-08-06
- Data updated: 2026-11-13
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/period-diary-flow-and-ovulation/id1021545958/reviews.md

## What is Period Diary?

A gentle, clear, and private space to track your menstrual cycle.

Period Diary is a beautifully redesigned menstrual cycle, period, and ovulation tracker created to bring calm clarity to every phase of your month. Whether you have regular or irregular cycles, are planning ahead for holidays and events, or want a simple, clutter-free way to log your daily flow strength and personal notes, Period Diary keeps everything effortless—and 100% private on your phone.

WHY WOMEN LOVE PERIOD DIARY

• Gentle, Clear Visual Cycle Wheel
See exactly where you are in your cycle at a glance. Soft rose highlights your period days while soothing lavender highlights your estimated fertile window and ovulation day, with zero clutter or confusing menus.

• Simple Daily Flow Strength & Custom Notes
Record what matters without overwhelming forms. Tap any day to log your menstrual flow strength (No Period, Light, Medium, Heavy, or Very Heavy) and write your own custom personal notes.

• Accurate, Adaptive Cycle Predictions
Start with your typical cycle and period length, or enable Smart Predictions (Premium) to automatically adapt to your confirmed cycle history—filtering out unusual one-off outlier cycles.

• Home Screen Calendar & Status Widget (Premium)
Glance at your current cycle day, phase status, and full monthly period & fertility calendar right from your iPhone Home Screen—without even opening the app.

• Plan Months Ahead with Horizon View (Premium)
Traveling, planning a wedding, or scheduling a trip? Choose to predict 1, 3, 6, or up to 12 future cycles in your Calendar and Period Log so you’re never caught off guard.

• 100% On-Device Privacy & Face ID / Passcode App Lock
Your intimate cycle data belongs only to you. All cycle history, flow logs, and notes are stored locally on your device—no mandatory account creation and no cloud selling. Enable Face ID / Passcode App Lock (Premium) for extra peace of mind.

• Clean PDF & CSV Period Log Exports (Premium)
Export your cycle history—including start dates, end dates, estimated ovulation dates, cycle length bar charts, and CSV tables—in one tap for your personal records or next healthcare appointment.

• Gentle, Customizable Reminders
Receive discreet 9:00 AM notifications 1 to 7 days before your next period is expected to start, before your fertile window begins, or before your fertile window closes.

DESIGNED FOR CLARITY & HONESTY
Please note: Period Diary estimates upcoming periods, fertile windows, and ovulation days based on your logged cycle history and standard luteal phase calculations. Because ovulation can vary from cycle to cycle, these estimates are intended for personal wellness awareness and should not be used as contraception or to prevent pregnancy.

## Key features

- Private data, no account needed
- Accurate period and ovulation predictions
- Learns from logged cycle data
- Tracks weight, flow, intimacy, temperature
- Future predictions 3+ months in advance
- Daily notes for symptoms and birth control

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Period. Premium Lifetime | $5.99 | one-time |


## What do users think of Period Diary?

Reviews of Period Diary are mixed: the Health & Fitness app is rated 4.1/5 from 429 App Store ratings. What users like most: no account required, data stays on device, simple and minimalist design. Top complaints: frequent app crashes and instability, calendar functionality broken or inaccessible. Summarized from real user reviews.

**Pros**

- 🔒 No account required, data stays on device
- 👍 Simple and minimalist design
- 💰 Free basic period tracking without paywall
- 📱 Intuitive for basic tracking needs
- 🎨 Aesthetic and visually appealing interface
- ⚡ Quick access to period predictions
- 👥 Suitable for younger users under 13

**Cons**

- 🐛 Frequent app crashes and instability
- 🐛 Calendar functionality broken or inaccessible
- ❌ Cannot edit period end dates properly
- ❌ Cannot log past period dates
- 🌍 No timezone support causing date confusion
- 👁️ Poor accessibility and low contrast text
- 📚 Unclear color coding without explanation
- 🎯 Confusing UI and non-intuitive navigation
- 💳 Premium purchase issues and failed billing
- 📺 Excessive or inappropriate ads
- 🔧 Settings not saving properly
- 📊 Inaccurate cycle predictions for irregular periods
- 🌐 No localization for different countries/languages
- 🔤 Inconsistent and tiny text sizing

**Commonly reported bugs**

- App crashes when opening calendar
- App crashes when trying to edit start dates
- Cannot set period end date in same month as start date
- Cannot log dates from previous months
- App freezes during countdown timer
- Premium purchase not registering after payment
- Restore purchase function not working
- Settings not persisting after changes
- Notifications settings not saving
- App crashes during initial setup
- Calendar glitches with date selection
- Auto-sets end date to current date instead of allowing edits
- Dark interface with poor text readability
- Notifications button crashes app when clicked
- Inconsistent app performance and stability

**Most requested features**

- Option to hide fertility tracking, show only period days
- Timezone selection capability
- Notes or symptom logging on calendar
- Clearer explanation of color coding system
- Support for irregular cycle adjustments
- Customizable tracking options for different body types
- Dark mode or adjustable contrast settings
- Localization for different countries and age groups
- Temperature tracking in Celsius and Fahrenheit
- Ability to edit past period entries
- More detailed symptom tracking options

## Is Period Diary safe?

Period Diary: Flow & Ovulation appears mostly safe based on user ratings. The AppsHunter Safety Score for Period Diary is 81 out of 100. This assessment is based on 429 user ratings, with an App Store average of 4.1 out of 5. Of 429 App Store ratings, 74.1% point to a safe experience, 7.7% suggest some concerns, and 18.2% point to a risky experience.

## Is Period Diary legit?

Period Diary: Flow & Ovulation appears to be a legitimate app. The AppsHunter Legitimacy Score for Period Diary is 95 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (10 of 66)

All indexed reviews: https://appshunter.io/ios/app/period-diary-flow-and-ovulation/id1021545958/reviews.md

### 2/5 — I liked the old version better

*2026-10-08*

If I would have reviewed this app before, I would have given it 5 stars but it has since updated and I don’t like it and now having to look for a new period tracker.

### 1/5 — App Issues

*2026-05-17*

I have really liked this app; however it has stopped working. Please post an update. I will change my review.

### 3/5 — Simplicity Request

*2024-06-12*

Could you please offer the ability to only track periods on the calendar without seeing the purple fertility days? That would be great.

### 3/5 — Slight problem

*2024-02-20, version 2.0.15*

The problem is that we’re it says temperature, I think it’s in Fahrenheit. And I’m Aussie so just sorta left it at the same temperature as it started. Also another thing I feel like this app is more suited for older than 35 year old woman. I will say I’m gen z and quite a bit younger than 35. I guess what I’m trying to say is maybe there could be different countries/age language changes. And if you’ve gotten as far as reading all this THANK U
<3 much love from Australia 🇦🇺😀

### 1/5 — Very basic

*2024-01-04*

Every time I try and open the calendar on this app it closes the app it is just too basic for me

### 5/5 — I love it

*2023-12-31*

I love this app because I use to have flo and it was a good app but it was a little bit complicated but this app is not complicated but I love it and every time it tells me exactly when I’m going to start my period and when I’m going to end it and so far it’s been right

### 1/5 — Not impressed

*2023-12-10, version 2.0.15*

I go to set up for first time and there is a giant add covering the whole screen, it was for a dating site.  the two people had their heads leaned into each other and they were both men! Which woman was that directed to? Totally immoral anyway seems tough to find normal things these days. Will not use a company that promotes immorality. Will keep looking for something wholesome.

### 2/5 — Not worth the premium price but good for a free app

*2023-12-08, version 2.0.15*

I like the aesthetic and good free I guess. I bought it and immediately regretted it because then the app kept crashing. I’ve requested for a refund. Not worth it

### 1/5 — NO

*2023-10-06, version 2.0.15*

DONT LIKE THIS APP

### 5/5 — Very simple like it should be

*2023-10-01*

I picked this app because the developer said your data doesn’t leave your phone. (Period math isn't so complex it needs to live on a server! I’m disturbed by all the other apps that take your info.) I was inclined to believe it because the the interface looked dignified and simple, made by one person and not a data mining company. App works great. I open the app to check when my period is supposed to start, I open to log when it does start, and I open to update the log to when it actually ended. You can adjust your standard period length and it will update its predicted dates, and if your period changes this month it will update future predictions accordingly.

## Frequently asked questions about Period Diary

### What does this period tracking app do?

This app serves as a simple and private ovulation, fertility, and period tracker. It helps you monitor your menstrual cycle, predict future periods and fertile windows, and understand your reproductive health. It learns from your logged data to provide increasingly accurate predictions.

### How does the app predict my period and ovulation?

The app uses a powerful and accurate prediction algorithm that learns from each time you log your menstrual cycle and symptoms. This smart algorithm helps provide the most accurate data and predictions for your unique cycle, including fertile phases and expected period start dates.

### Is this app free to use?

The app is free to download and use, offering core tracking functionalities. It also includes in-app purchases, which may unlock additional features or advanced functionalities for users who wish to enhance their tracking experience.

### What information can I track with this app?

You can track a variety of data points related to your menstrual cycle and reproductive health. This includes your period flow, intimacy, temperature, and daily symptoms. You can also take notes on birth control pills and other relevant information.

### Who is this app designed for?

This app is designed for anyone who wants a simple, discreet, and private way to track their menstrual cycle, ovulation, and fertility. It's particularly useful for individuals who prefer not to share their data online or require accurate predictions for family planning or general health monitoring.

## Version history (last 5 releases)

### 4.0.0 — 2026-11-12

A Gentle New Look & Home Screen Calendar Widget!
• Fresh Rose & Lavender Design: A calm, clear, and cute visual redesign across the Cycle Wheel, Calendar, and Period Log.
• NEW Home Screen Calendar Widget (Premium): See your current cycle day, status, and monthly period & fertile calendar right on your Home Screen.
• Enhanced Prediction Accuracy: Unified timezone-safe day calculations and improved outlier filtering so your Cycle Wheel, Calendar, and countdowns are always in sync.

### 3.1.1 — 2026-09-23

Improving the app for a better user experience!

### 3.1.0 — 2026-08-15

New features for all users:
- Ads completely removed
- Menstrual Cycle notifications free for everybody

Premium features:
- export your cycle logs with charts and tables for your doctor
- privacy lock the app with passcode
- generate more future predictions up to 12 months in advance

### 3.0.2 — 2026-08-11

Improvements for easier app navigation and UX.

### 3.0.1 — 2026-05-25

Improving the app for you, enhancing cycle predictions and design

## Apps similar to Period Diary

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Period Tracker: Cycle Calendar](https://appshunter.io/ios/app/period-tracker-cycle-calendar/id1541331292) | 4.6 (144) | Free | Health & Fitness |
| [Ovulation Tracker: Period App](https://appshunter.io/ios/app/ovulation-tracker-period-app/id1485687674) | 4.3 (83) | Free | Health & Fitness |
| [Her Calendar: Period Tracker](https://appshunter.io/ios/app/her-calendar-period-tracker/id1578659830) | 4.7 (62) | Free | Health & Fitness |
| [Period Tracker: Menstrual Flow](https://appshunter.io/ios/app/period-tracker-menstrual-flow/id1435754529) | 4.6 (178) | Free | Health & Fitness |
| [Flyer Period Tracker](https://appshunter.io/ios/app/flyer-period-tracker/id1556205664) | 4.0 (22) | Free | Health & Fitness |
| [Period Tracker: Monthly Cycles](https://appshunter.io/ios/app/period-tracker-monthly-cycles/id368868193) | 4.0 (3,810) | Free | Health & Fitness |

## More apps by Sasa Kolda

- [Buzzer Said It: Custom Prank](https://appshunter.io/ios/app/buzzer-said-it-custom-prank/id1406002471)
- [Tummy Time: Baby Play & Track](https://appshunter.io/ios/app/tummy-time-baby-play-and-track/id1609788420)
- [Three Little Things](https://appshunter.io/ios/app/three-little-things/id6752028768)
- [Say What U 8: Simple Calories](https://appshunter.io/ios/app/say-what-u-8-simple-calories/id6762486150)
- [Lara's Animal Flashcards](https://appshunter.io/ios/app/laras-animal-flashcards/id6802810027)

All apps by Sasa Kolda: https://appshunter.io/developer/1673557983

## Related topics

[sasa kolda](https://appshunter.io/ios/topics/sasa-kolda)

---

*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 2026-11-13.*