# SEM vs Iron Switch

The clearest difference is rating: Iron Switch at 5.0 against SEM's 3.4. Iron Switch also leads on update cadence (weekly vs every 2 weeks). SEM's advantage is in-app purchases (none vs 3) and ratings volume (11 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Iron Switch sells 3 in-app purchases, starting at $9.99 per month. SEM asks for nothing beyond the download.

Iron Switch 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 1, so its average is the more settled of the two.

SEM ships an update every 2 weeks, Iron Switch weekly. The most recent releases landed on October 2, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SEM | Iron Switch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (11 ratings)](https://appshunter.io/ios/app/sem-meter/id6468902139/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/iron-switch-dead-man-switch/id6788568339/reviews)** |
| Number of ratings | **11** | 1 |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 31 MB | 23 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Dashi Wisdom Technology Co., Ltd.](https://appshunter.io/developer/1822219570) | [Felipe Oliveira](https://appshunter.io/developer/1896341825) |

## 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


### Iron Switch

[App page](https://appshunter.io/ios/app/iron-switch-dead-man-switch/id6788568339)

Securely store encrypted digital assets like crypto keys and passwords. If you stop checking in, this app automatically delivers access to designated recipients, ensuring your digital legacy is protected.

**Highlights:** Encrypted vault for sensitive data, Automated delivery to trusted recipients, Customizable check-in intervals, Zero-knowledge AES-256 encryption, Face ID/Touch ID app lock, Offline recovery kit

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Operator Monthly | $9.99 | per month |
| Commander Monthly | $29.99 | per month |
| Legacy Lifetime | $499.99 | one-time |


## Frequently asked questions

### Is SEM free?

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

### Is Iron Switch free?

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

### Which has better reviews, SEM or Iron Switch?

Iron Switch is rated higher. SEM averages 3.4 out of 5 from 11 ratings, while Iron Switch averages 5.0 from 1 ratings.

### Do SEM or Iron Switch have ads?

Neither SEM nor Iron Switch shows ads.

### Which is updated more often, SEM or Iron Switch?

SEM ships an update every 2 weeks, and Iron Switch weekly. Most recently, SEM was updated on October 2, 2026 and Iron Switch on October 13, 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.*