# umop ǝpısdn vs Decibel Meter

The clearest difference is rating: Decibel Meter at 4.8 against umop ǝpısdn's 2.7. Decibel Meter also leads on update cadence (monthly vs every 12 months) and ratings volume (50 vs 6). umop ǝpısdn's advantage is in-app purchases (none vs 3) and device support (3 vs 1). On price, review sentiment and ads there is nothing between them.

Both are free to download. Decibel Meter sells 3 in-app purchases, starting at $2.99 per 7 days. umop ǝpısdn asks for nothing beyond the download.

Decibel Meter holds the better App Store score, 4.8 against 2.7. That said, the two scores are not equally well evidenced: Decibel Meter has 50 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 73% of umop ǝpısdn's written reviews are positive against 70% of Decibel Meter's, so the app with the better star average is not the one people write more warmly about.

umop ǝpısdn ships an update every 12 months, Decibel Meter monthly. The most recent releases landed on October 8, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | umop ǝpısdn | Decibel Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (6 ratings)](https://appshunter.io/ios/app/umop-psdn/id354900325/reviews) | **[4.8 (50 ratings)](https://appshunter.io/ios/app/decibel-meter-db-noise-level/id6744018521/reviews)** |
| Number of ratings | 6 | **50** |
| Positive reviews | **72.7% of reviews** | 70.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 176 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [curmi.com](https://appshunter.io/developer/354900328) | [PaoApps](https://appshunter.io/developer/1746019535) |

## What reviewers say

### umop ǝpısdn

[App page](https://appshunter.io/ios/app/umop-psdn/id354900325)

Easily convert your typed text into an upside-down format for unique messages and emails. Offers options for lowercase conversion, phone number linking, and compatibility with Windows users. Supports accented characters and emojis.

**Highlights:** Flip text upside down, Convert to lowercase, Handle phone number links, Windows compatibility option, Support accented characters and emoji

**Features:** Vision Pro support

**In-app purchases:** none


### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-db-noise-level/id6744018521)

This tool transforms your iPhone into a real-time sound level meter. It measures and displays environmental noise in decibels, helping you monitor sound at home, work, or outdoors. Protect your hearing by detecting loud noises and staying aware of your sound environment.

**Highlights:** Real-time decibel measurement, Dynamic graph display, Min/Max/Average sound levels, Measuring timer, Pause and Reset buttons, Noise pollution checks

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access with Trial | $2.99 | per 7 days |
| Weekly Access | $2.99 | per 7 days |
| Yearly Access | $17.99 | per year |


## Frequently asked questions

### Is umop ǝpısdn free?

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

### Is Decibel Meter free?

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

### Which has better reviews, umop ǝpısdn or Decibel Meter?

Decibel Meter is rated higher. umop ǝpısdn averages 2.7 out of 5 from 6 ratings, while Decibel Meter averages 4.8 from 50 ratings.

### Do umop ǝpısdn or Decibel Meter have ads?

Neither umop ǝpısdn nor Decibel Meter shows ads.

### Which is updated more often, umop ǝpısdn or Decibel Meter?

umop ǝpısdn ships an update every 12 months, and Decibel Meter monthly. Most recently, umop ǝpısdn was updated on October 8, 2026 and Decibel Meter on October 17, 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.*