# Relay Smart Agent vs HMH Science Dimensions

The clearest difference is rating: HMH Science Dimensions at 2.3 against Relay Smart Agent's 1.2. HMH Science Dimensions also leads on review sentiment (25% vs 0%) and iOS requirement (9.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

HMH Science Dimensions holds the better App Store score, 2.3 against 1.2. Both are backed by a comparable volume of ratings — 33 and 17 respectively. Written reviews point the same way: 0% of Relay Smart Agent's written reviews are positive against 25% of HMH Science Dimensions's.

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | Relay Smart Agent | HMH Science Dimensions |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.2 (33 ratings)](https://appshunter.io/ios/app/relay-smart-agent/id1374371214/reviews) | **[2.3 (17 ratings)](https://appshunter.io/ios/app/hmh-science-dimensions/id1384935325/reviews)** |
| Number of ratings | **33** | 17 |
| Positive reviews | 0.0% of reviews | **25.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 9 MB | 227 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lightspeed Solutions, LLC](https://appshunter.io/developer/367422071) | [Houghton Mifflin Harcourt](https://appshunter.io/developer/409368007) |

## What reviewers say

### 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


### HMH Science Dimensions

[App page](https://appshunter.io/ios/app/hmh-science-dimensions/id1384935325)

This augmented reality app transforms book covers into interactive science experiments. Students can scan their textbooks to launch 3D models and explore concepts like weather, solar energy, and the solar system. It's designed to make learning engaging and fun for young students.

**Highlights:** Augmented reality science experiments, Scan book covers to activate content, Interactive 3D models, Explores various science topics, Engaging learning experience, Group or pair work friendly

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Relay Smart Agent free?

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

### Is HMH Science Dimensions free?

HMH Science Dimensions is free to download, with no in-app purchases.

### Which has better reviews, Relay Smart Agent or HMH Science Dimensions?

HMH Science Dimensions is rated higher. Relay Smart Agent averages 1.2 out of 5 from 33 ratings, while HMH Science Dimensions averages 2.3 from 17 ratings.

### Do Relay Smart Agent or HMH Science Dimensions have ads?

Neither Relay Smart Agent nor HMH Science Dimensions shows ads.

### Which is updated more often, Relay Smart Agent or HMH Science Dimensions?

Relay Smart Agent ships an update every 2 months, and HMH Science Dimensions every 2 months. Most recently, Relay Smart Agent was updated on November 2, 2026 and HMH Science Dimensions 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.*