# Period vs TempCurve BBT Chart

The clearest difference is iOS requirement: Period at 13.0 against TempCurve BBT Chart's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 18, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Period | TempCurve BBT Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (2.4K ratings)](https://appshunter.io/ios/app/period-tracker/id6480586681/reviews)** | — |
| Number of ratings | **2.4K** | — |
| Positive reviews | 53.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Free | — |
| Size | 56 MB | 4 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [SPD Development Company Ltd](https://appshunter.io/developer/976408511) | [拥军 刘](https://appshunter.io/developer/1896777340) |

## What reviewers say

### Period

[App page](https://appshunter.io/ios/app/period-tracker/id6480586681)

Track your menstrual cycle, log period dates, ovulation test results, and symptoms. Gain insights into fertility probability based on your cycle length. This app helps predict periods and monitor cycles.

**Highlights:** Menstrual cycle tracking, Period logging, Ovulation test logging, Symptom tracking, Fertility probability insights, Cycle length comparison

**In-app purchases:** none

**What reviewers like**

- 👍 Accurate tracking
- 🚀 Easy to use
- 💡 Helpful for fertility tracking

**What reviewers complain about**

- 🐛 Notifications not working as expected
- 🐛 Data loss after updates
- 🐛 Broken links in the app
- 💡 No option to log basal body temperature

**Reported bugs**

- Dates and data getting changed after updates
- Calendar not populating after updates
- Whole calendar getting erased after updates

**Requested features**

- Add option to log basal body temperature
- Improve notification customization


### TempCurve BBT Chart

[App page](https://appshunter.io/ios/app/tempcurve-bbt-chart/id6776111769)

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

**In-app purchases:** none


## Frequently asked questions

### Is Period free?

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

### Is TempCurve BBT Chart free?

TempCurve BBT Chart is free to download, with no in-app purchases.

### Do Period or TempCurve BBT Chart have ads?

Neither Period nor TempCurve BBT Chart shows ads.

### Which is updated more often, Period or TempCurve BBT Chart?

Period ships an update monthly, and TempCurve BBT Chart monthly. Most recently, Period was updated on October 18, 2026 and TempCurve BBT Chart on October 9, 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.*