# SEM vs AcousticOwl

The clearest difference is rating: AcousticOwl at 5.0 against SEM's 3.4. AcousticOwl also leads on update cadence (every 6 days vs every 2 weeks). SEM's advantage is ratings volume (11 vs 2) and iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

AcousticOwl holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: SEM has 11 ratings behind it against 2, so its average is the more settled of the two.

SEM ships an update every 2 weeks, AcousticOwl every 6 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | SEM | AcousticOwl |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (11 ratings)](https://appshunter.io/ios/app/sem-meter/id6468902139/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/acousticowl-room-acoustics/id6810374792/reviews)** |
| Number of ratings | **11** | 2 |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Monetization | Free | Free |
| Size | 31 MB | 33 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Dashi Wisdom Technology Co., Ltd.](https://appshunter.io/developer/1822219570) | [Tectora LLC](https://appshunter.io/developer/6810374794) |

## What reviewers say

### SEM

[App page](https://appshunter.io/ios/app/sem-meter/id6468902139)

This utility app monitors your household power consumption in real-time, providing historical data and comparisons to help you save on electricity bills. It supports managing multiple devices and customizing electricity fee calculations.

**Highlights:** Real-time power usage monitoring, Historical energy use tracking, Second-to-second, day-to-day, week-to-week, month-to-month, and year-to-year comparisons, Electricity fee gradient calculation, Customizable fee templates, Multiple device management

**In-app purchases:** none


### AcousticOwl

[App page](https://appshunter.io/ios/app/acousticowl-room-acoustics/id6810374792)

Design acoustic treatment plans for any room. This app models your space, predicts sound quality, and suggests panel placement and quantities based on real absorption data and acoustic formulas. Visualize your treated room in 3D and share your designs.

**Highlights:** Room measurement via LiDAR or manual drawing, Predictive sound quality analysis (RT60, room modes), Customizable treatment plans for various room types, 3D visualization of treated rooms, Catalog of acoustic materials with absorption data, Cross-device syncing and shareable read-only links

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

**In-app purchases:** none


## Frequently asked questions

### Is SEM free?

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

### Is AcousticOwl free?

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

### Which has better reviews, SEM or AcousticOwl?

AcousticOwl is rated higher. SEM averages 3.4 out of 5 from 11 ratings, while AcousticOwl averages 5.0 from 2 ratings.

### Do SEM or AcousticOwl have ads?

Neither SEM nor AcousticOwl shows ads.

### Which is updated more often, SEM or AcousticOwl?

SEM ships an update every 2 weeks, and AcousticOwl every 6 days. Most recently, SEM was updated on November 3, 2026 and AcousticOwl on October 31, 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.*