# SKF Machine train alignment vs Decibel Meter Ultra

The clearest difference is in-app purchases: SKF Machine train alignment at none against Decibel Meter Ultra's 7. SKF Machine train alignment also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.6). Decibel Meter Ultra's advantage is update cadence (every 10 days vs every 3 months). On price and ads there is nothing between them.

Both are free to download. Decibel Meter Ultra sells 4 in-app purchases, starting at $7.99 per 7 days. SKF Machine train alignment asks for nothing beyond the download.

SKF Machine train alignment ships an update every 3 months, Decibel Meter Ultra every 10 days. The most recent releases landed on October 19, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | SKF Machine train alignment | Decibel Meter Ultra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (2.6K ratings)](https://appshunter.io/ios/app/decibel-meter-ultra/id1643525961/reviews)** |
| Number of ratings | — | **2.6K** |
| Positive reviews | — | 44.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 69 MB | 91 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [SKF](https://appshunter.io/developer/472922971) | [Ultrafine](https://appshunter.io/developer/1558108175) |

## What reviewers say

### SKF Machine train alignment

[App page](https://appshunter.io/ios/app/skf-machine-train-alignment/id1149906003)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel Meter Ultra

[App page](https://appshunter.io/ios/app/decibel-meter-ultra/id1643525961)

Measure, record, and analyze sound levels in your environment. This app offers precision metering, noise elimination tools, hearing protection features, and home audio calibration. It provides detailed reports and can be used with device microphones or external ones.

**Highlights:** Precision sound level metering, Noise logging and reporting, Hearing protection dosimeter, Fractional octave band analysis, Real-time analyzer, External microphone support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Access | $7.99 | per 7 days |
| PRO Access | $11.99 | per month |
| PRO Access | $39.99 | per year |
| PRO Access | $39.99 | per year |

**What reviewers like**

- 🎨 Aesthetically pleasing design
- 🔍 Useful noise monitoring features
- 🔍 Ability to collect noise evidence

**What reviewers complain about**

- 💰 Expensive subscription pricing
- 🚫 Misleading free trial claims
- 🚫 Difficult to cancel subscription
- 🔍 Inconsistent noise level readings

**Reported bugs**

- Subscription charges continue after cancellation
- Subscription cancellation page doesn't load

**Requested features**

- Lower subscription pricing
- Improve subscription cancellation process


## Frequently asked questions

### Is SKF Machine train alignment free?

SKF Machine train alignment is free to download, with no in-app purchases.

### Is Decibel Meter Ultra free?

Decibel Meter Ultra is free to download, with in-app purchases available.

### Do SKF Machine train alignment or Decibel Meter Ultra have ads?

Neither SKF Machine train alignment nor Decibel Meter Ultra shows ads.

### Which is updated more often, SKF Machine train alignment or Decibel Meter Ultra?

SKF Machine train alignment ships an update every 3 months, and Decibel Meter Ultra every 10 days. Most recently, SKF Machine train alignment was updated on October 19, 2026 and Decibel Meter Ultra on October 27, 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.*