# Signal GH vs SEM

The clearest difference is price: SEM at Free against Signal GH's $2.99. SEM also leads on update cadence (every 2 weeks vs every 4 months). Signal GH's advantage is rating (4.6 vs 3.4) and review sentiment (70% vs 38%). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

SEM is free to download; Signal GH costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Signal GH holds the better App Store score, 4.6 against 3.4. That said, the two scores are not equally well evidenced: Signal GH has 544 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 70% of Signal GH's written reviews are positive against 38% of SEM's.

Signal GH ships an update every 4 months, SEM every 2 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Signal GH | SEM |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.6 (544 ratings)](https://appshunter.io/ios/app/signal-gh/id289580769/reviews)** | [3.4 (11 ratings)](https://appshunter.io/ios/app/sem-meter/id6468902139/reviews) |
| Number of ratings | **544** | 11 |
| Positive reviews | **69.7% of reviews** | 37.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Paid | **Free** |
| Best chart rank | **#181** | — |
| Size | 10 MB | 31 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | **iPhone, iPad, Apple TV** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Generally Helpful Software](https://appshunter.io/developer/286015711) | [Hangzhou Dashi Wisdom Technology Co., Ltd.](https://appshunter.io/developer/1822219570) |

## What reviewers say

### Signal GH

[App page](https://appshunter.io/ios/app/signal-gh/id289580769)

**Currently charting:** #181 Top Paid · Utilities (US App Store)

This tool helps HDHomerun users monitor and enhance their Over The Air (OTA) TV reception. It visualizes signal quality across channels, aiding in hardware adjustments for better performance. Features include system state snapshots and a broadcast tower map for US users.

**Highlights:** Monitor OTA signal quality, Graph multiple channels simultaneously, Adjust and upgrade receiving hardware, Snapshot system states for experiments, Broadcast tower map (US users), Manual channel tuning

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Helpful for antenna positioning
- 👍 Provides real-time signal data
- 💡 Useful map and compass features
- 🔧 Troubleshoots signal issues
- ⏱️ Saves time adjusting antenna

**What reviewers complain about**

- 🐛 Crashes and freezes
- 🤔 Confusing or unintuitive UI
- 🔍 Doesn't detect all channels
- 🚫 Requires HDHomeRun device
- ⚠️ Issues with ATSC 3.0 support

**Reported bugs**

- Scanning stops with no channels found
- Incorrect channel numbers and frequencies
- Tuner locking issues with other apps

**Requested features**

- Option to keep screen on during use
- Ability to select individual virtual channels
- Increase signal polling frequency and history
- Add more visual indicators for signal quality


### 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


## Frequently asked questions

### Is Signal GH free?

Signal GH costs $2.99, with no in-app purchases.

### Is SEM free?

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

### Which has better reviews, Signal GH or SEM?

Signal GH is rated higher. Signal GH averages 4.6 out of 5 from 544 ratings, while SEM averages 3.4 from 11 ratings.

### Do Signal GH or SEM have ads?

Neither Signal GH nor SEM shows ads.

### Which is updated more often, Signal GH or SEM?

Signal GH ships an update every 4 months, and SEM every 2 weeks. Most recently, Signal GH was updated on November 6, 2026 and SEM on November 3, 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.*