# iSeismometer vs Relay Smart Agent

The clearest difference is review sentiment: iSeismometer at 76% against Relay Smart Agent's 0%. iSeismometer also leads on rating (3.6 vs 1.2) and ratings volume (172 vs 33). Relay Smart Agent's advantage is update cadence (every 2 months vs every 7 months). 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.

iSeismometer holds the better App Store score, 3.6 against 1.2. That said, the two scores are not equally well evidenced: iSeismometer has 172 ratings behind it against 33, so its average is the more settled of the two. Written reviews point the same way: 76% of iSeismometer's written reviews are positive against 0% of Relay Smart Agent's.

iSeismometer ships an update every 7 months, Relay Smart Agent every 2 months. The most recent releases landed on November 12, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | iSeismometer | Relay Smart Agent |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (172 ratings)](https://appshunter.io/ios/app/iseismometer-seismograph/id304190739/reviews)** | [1.2 (33 ratings)](https://appshunter.io/ios/app/relay-smart-agent/id1374371214/reviews) |
| Number of ratings | **172** | 33 |
| Positive reviews | **76.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 3 MB | 9 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [Lightspeed Solutions, LLC](https://appshunter.io/developer/367422071) |

## What reviewers say

### iSeismometer

[App page](https://appshunter.io/ios/app/iseismometer-seismograph/id304190739)

Transform your mobile device into a sensitive seismograph to measure vibrations and detect tremors. Analyze seismic data, view live feeds of earthquakes, and even stream readings to your Mac for comprehensive analysis. Ideal for educational exploration and understanding ground motion.

**Highlights:** Live seismograph with three axes, Event detection for tremors, Automatic recording and export, Live USGS earthquake feed, Stream data to Mac, Gravity filter and live spectrum analysis

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 🚀 Sensitive and accurate
- 👍 Simple and easy to use
- 💡 Useful for various applications (e.g. monitoring vibrations, detecting heartbeat)

**What reviewers complain about**

- 🐛 Crashes or freezes on newer devices
- 🔋 High battery consumption
- 🔒 Lacks security/privacy features (e.g. no option to disable data transmission)

**Reported bugs**

- Buttons/controls not working on newer iOS versions
- Keyboard not appearing in text input fields
- Inconsistent performance across device models

**Requested features**

- Add sensitivity control
- Implement zero control for reference plane
- Increase recording time
- Improve UI/UX (e.g. color coding, scrolling, chart speed control)
- Implement Richter scale or other measurement units


### Relay Smart Agent

[App page](https://appshunter.io/ios/app/relay-smart-agent/id1374371214)

This application offers web filtering and safety features for iOS devices, ensuring CIPA compliance for schools. It provides on and off-campus protection and reports on student activity, acting as a hardware-free cloud solution.

**Highlights:** CIPA compliant web filtering, On/off campus safety, Student activity reporting, Hardware-free cloud solution, Anytime, anywhere filtering

**In-app purchases:** none


## Frequently asked questions

### Is iSeismometer free?

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

### Is Relay Smart Agent free?

Relay Smart Agent is free to download, with no in-app purchases.

### Which has better reviews, iSeismometer or Relay Smart Agent?

iSeismometer is rated higher. iSeismometer averages 3.6 out of 5 from 172 ratings, while Relay Smart Agent averages 1.2 from 33 ratings.

### Do iSeismometer or Relay Smart Agent have ads?

Neither iSeismometer nor Relay Smart Agent shows ads.

### Which is updated more often, iSeismometer or Relay Smart Agent?

iSeismometer ships an update every 7 months, and Relay Smart Agent every 2 months. Most recently, iSeismometer was updated on November 12, 2026 and Relay Smart Agent on November 2, 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.*