# RubberSource vs STEP Viewer

The clearest difference is update cadence: STEP Viewer at every 5 days against RubberSource's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

RubberSource ships an update every 3 weeks, STEP Viewer every 5 days. The most recent releases landed on September 30, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | RubberSource | STEP Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Size | 23 MB | 61 MB |
| Requires iOS | **12.3** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Avanaire Design, LLC](https://appshunter.io/developer/409628132) | [Smart Cube Labs Co., Ltd.](https://appshunter.io/developer/1456342688) |

## What reviewers say

### RubberSource

[App page](https://appshunter.io/ios/app/rubbersource/id6455788482)

**Features:** macOS Compatibility

**In-app purchases:** none


### STEP Viewer

[App page](https://appshunter.io/ios/app/step-viewer/id6756539299)

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

**In-app purchases:** none


## Frequently asked questions

### Is RubberSource free?

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

### Is STEP Viewer free?

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

### Do RubberSource or STEP Viewer have ads?

Neither RubberSource nor STEP Viewer shows ads.

### Which is updated more often, RubberSource or STEP Viewer?

RubberSource ships an update every 3 weeks, and STEP Viewer every 5 days. Most recently, RubberSource was updated on September 30, 2026 and STEP Viewer on September 17, 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.*