---
title: "Once(A special period tracker) — App Overview"
url: https://marlvel.ai/intel-report/health-fitness/once-a-special-period-tracker
category: Health & Fitness
developer: Malang Studio Co. Ltd,
platforms: ios, android
rating: 4.4 (359.6K ratings)
pricing: freemium
report_level: overview
generated: 2026-04-19
---

<!-- SECTION: Key Insight -->
> **Key Insight:** While the app offers core cycle tracking functionality, recent user feedback highlights significant stability issues, synchronization failures, and frustration regarding ad-supported data entry.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Health & Fitness |
| Rating | 4.4 ★ (359.6K) |
| Pricing | freemium |
| Platforms | iOS, Android |
| Latest Version (iOS) | 1.9.5 |
| Latest Version (Android) | 12.9 |
| Developer | Malang Studio Co. Ltd, |

<!-- SECTION: Summary -->
## What is Once(A special period tracker)?

Once is a Health & Fitness app designed to help users track menstrual cycles, ovulation, and fertility windows. The app claims to provide increasingly accurate cycle predictions and symptom logging through a simplified calendar interface.

<!-- SECTION: Key Features -->
## Key Features

- **Cycle Prediction**: Automatically calculates estimated period dates and irregular cycles, improving in accuracy over time.
- **Fertility Tracking**: Provides insights into ovulation and fertile windows to assist with pregnancy planning or birth control awareness.
- **Symptom Journaling**: Allows users to record specific health symptoms and cycle history within a centralized calendar.

<!-- SECTION: Target Audience -->
## Who is it for?

Women seeking a digital tool to monitor menstrual health, fertility, and cycle-related symptoms.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/once-a-special-period-tracker/id990572129?uo=4)
- [Google Play](https://play.google.com/store/apps/details?id=com.period.tracker.lite&hl=en&gl=us)
- [Full Intelligence Report](https://marlvel.ai/intel-report/health-fitness/once-a-special-period-tracker)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/health-fitness/once-a-special-period-tracker).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*