# CoatingMaster vs Ovulation Tracker & Calculator

The clearest difference is in-app purchases: CoatingMaster at none against Ovulation Tracker & Calculator's 3. CoatingMaster also leads on ads (none vs shown) and iOS requirement (11.0 vs 17.0). Ovulation Tracker & Calculator's advantage is update cadence (every 3 weeks vs every 7 months). On price and device support there is nothing between them.

Both are free to download. Ovulation Tracker & Calculator sells 3 in-app purchases, starting at $1.99 per 7 days. CoatingMaster asks for nothing beyond the download.

CoatingMaster ships an update every 7 months, Ovulation Tracker & Calculator every 3 weeks. The most recent releases landed on September 23, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | CoatingMaster | Ovulation Tracker & Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (9 ratings)](https://appshunter.io/ios/app/ovulation-tracker-and-calculator/id6743263577/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 14 MB | 618 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [海军 欧阳](https://appshunter.io/developer/1284631051) | [ESPRESSO TECH (SMC-PRIVATE) LIMITED](https://appshunter.io/developer/1812366711) |

## What reviewers say

### CoatingMaster

[App page](https://appshunter.io/ios/app/coatingmaster/id1336000948)

This dual-purpose instrument uses magnetic and eddy current methods to measure the thickness of coatings on both magnetic and non-magnetic metal substrates. It features automatic substrate identification, multiple calibration options, and a negative display function for enhanced accuracy. The device offers audible prompts and both manual and automatic power-off modes.

**Highlights:** Magnetic and eddy current measurement, Automatic substrate identification, Single and two-point calibration, Basic calibration correction, Negative display for zero point accuracy, Audible prompts, Manual and automatic power-off

**Features:** macOS Compatibility

**In-app purchases:** none


### Ovulation Tracker & Calculator

[App page](https://appshunter.io/ios/app/ovulation-tracker-and-calculator/id6743263577)

This app helps users track their menstrual cycles, predict ovulation, and identify fertile days to increase the chances of conception. It offers features like period tracking, symptom logging, and cycle length analysis for a better understanding of reproductive health.

**Highlights:** Period tracking, Ovulation prediction, Fertility days calculator, Cycle length tracking, Symptom tracking, Sexual activity tracking

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $1.99 | per 7 days |
| Monthly Access | $4.99 | per month |
| Yearly Access | $24.99 | per year |


## Frequently asked questions

### Is CoatingMaster free?

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

### Is Ovulation Tracker & Calculator free?

Ovulation Tracker & Calculator is free to download, with in-app purchases available.

### Do CoatingMaster or Ovulation Tracker & Calculator have ads?

Ovulation Tracker & Calculator shows ads; CoatingMaster does not.

### Which is updated more often, CoatingMaster or Ovulation Tracker & Calculator?

CoatingMaster ships an update every 7 months, and Ovulation Tracker & Calculator every 3 weeks. Most recently, CoatingMaster was updated on September 23, 2026 and Ovulation Tracker & Calculator on October 16, 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.*