# Model Usage vs ROS Topic Viewer

The clearest difference is price: Model Usage at Free against ROS Topic Viewer's $4.99. Model Usage also leads on ads (none vs shown) and update cadence (every 3 days vs monthly). On in-app purchases and iOS requirement there is nothing between them.

Model Usage is free to download; ROS Topic Viewer costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Model Usage ships an update every 3 days, ROS Topic Viewer monthly. The most recent releases landed on September 16, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Model Usage | ROS Topic Viewer |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Monthly |
| Size | 5 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rayan Khan](https://appshunter.io/developer/1863389662) | [Jatupon Hongweing](https://appshunter.io/developer/1896471199) |

## What reviewers say

### Model Usage

[App page](https://appshunter.io/ios/app/model-usage/id6761831599)

**Features:** Apple Watch app, iMessage stickers

**In-app purchases:** none


### ROS Topic Viewer

[App page](https://appshunter.io/ios/app/ros-topic-viewer/id6783347908)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Model Usage free?

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

### Is ROS Topic Viewer free?

ROS Topic Viewer costs $4.99, with no in-app purchases.

### Do Model Usage or ROS Topic Viewer have ads?

ROS Topic Viewer shows ads; Model Usage does not.

### Which is updated more often, Model Usage or ROS Topic Viewer?

Model Usage ships an update every 3 days, and ROS Topic Viewer monthly. Most recently, Model Usage was updated on September 16, 2026 and ROS Topic Viewer on September 29, 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.*