# CoatingMaster vs Penometer

The clearest difference is review sentiment: Penometer at 83% against CoatingMaster's 0%. Penometer also leads on update cadence (every 3 weeks vs every 7 months). CoatingMaster's advantage is in-app purchases (none vs 3) and iOS requirement (11.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Penometer sells 3 in-app purchases, starting at $4.99 per month. CoatingMaster asks for nothing beyond the download.

CoatingMaster ships an update every 7 months, Penometer every 3 weeks. The most recent releases landed on September 23, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | CoatingMaster | Penometer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Freemium |
| Size | 14 MB | 16 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [海军 欧阳](https://appshunter.io/developer/1284631051) | [TotalContent](https://appshunter.io/developer/1542541643) |

## 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


### Penometer

[App page](https://appshunter.io/ios/app/penometer/id1561621238)

Measure and track your body size metrics over time. Compare your measurements to national and global averages, and gain insights with a built-in analysis tool. Your data is kept private and secure.

**Highlights:** Measure length, width, and girth, Track changes over time with graphs, Compare size to global and national averages, Micropenis analysis tool, Private and secure data storage, Unlimited measurement history (Premium), Advanced trend analysis (Premium)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $4.99 | per month |
| Full Access | $29.99 | per year |
| Full Access | $49.99 | one-time |


## Frequently asked questions

### Is CoatingMaster free?

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

### Is Penometer free?

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

### Do CoatingMaster or Penometer have ads?

Neither CoatingMaster nor Penometer shows ads.

### Which is updated more often, CoatingMaster or Penometer?

CoatingMaster ships an update every 7 months, and Penometer every 3 weeks. Most recently, CoatingMaster was updated on September 23, 2026 and Penometer on October 8, 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.*