# DAVID Ovulation Tracker vs 知子安

The clearest difference is in-app purchases: DAVID Ovulation Tracker at none against 知子安's 2. DAVID Ovulation Tracker also leads on iOS requirement (11.0 vs 17.0). 知子安's advantage is update cadence (every 6 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. 知子安 sells 2 one-off in-app purchases. DAVID Ovulation Tracker asks for nothing beyond the download.

DAVID Ovulation Tracker ships an update monthly, 知子安 every 6 days. The most recent releases landed on November 3, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | DAVID Ovulation Tracker | 知子安 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/david-ovulation-tracker/id1572795820/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 19.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 6 days** |
| Monetization | Free | — |
| Size | 122 MB | 105 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [婕 李](https://appshunter.io/developer/1570072252) | [军杰 王](https://appshunter.io/developer/1854450473) |

## What reviewers say

### DAVID Ovulation Tracker

[App page](https://appshunter.io/ios/app/david-ovulation-tracker/id1572795820)

This app helps women track their ovulation cycles and identify their fertile window. It allows users to upload ovulation test results for quick analysis and prediction, aiding in conception efforts. The app also provides menstrual cycle calculations and pregnancy-related knowledge.

**Highlights:** Ovulation tracking, Fertile window prediction, Ovulation test result analysis, Menstrual cycle calculation, Pregnancy knowledge base, Test record keeping

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

**In-app purchases:** none


### 知子安

[App page](https://appshunter.io/ios/app/id6811825268)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 在线识别 28 次 | $0.99 | one-time |
| 在线识别 98 次 | $3.99 | one-time |


## Frequently asked questions

### Is DAVID Ovulation Tracker free?

DAVID Ovulation Tracker is free to download, with no in-app purchases.

### Is 知子安 free?

知子安 is free to download, with in-app purchases available.

### Do DAVID Ovulation Tracker or 知子安 have ads?

Neither DAVID Ovulation Tracker nor 知子安 shows ads.

### Which is updated more often, DAVID Ovulation Tracker or 知子安?

DAVID Ovulation Tracker ships an update monthly, and 知子安 every 6 days. Most recently, DAVID Ovulation Tracker was updated on November 3, 2026 and 知子安 on October 29, 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.*