# onetest assessment vs STEMulator

The clearest difference is iOS requirement: onetest assessment at 9.3 against STEMulator's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

onetest assessment ships an update every 14 months, STEMulator every 9 months. The most recent releases landed on September 9, 2026 and May 19, 2026 respectively.

## The numbers

| Metric | onetest assessment | STEMulator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 9 months** |
| Size | 83 MB | 35 MB |
| Requires iOS | **9.3** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [onebillion](https://appshunter.io/developer/908075819) | [STEMulator](https://appshunter.io/developer/1760697221) |

## What reviewers say

### onetest assessment

[App page](https://appshunter.io/ios/app/onetest-assessment/id6443529135)

**Features:** macOS Compatibility

**In-app purchases:** none


### STEMulator

[App page](https://appshunter.io/ios/app/stemulator/id6599522008)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is onetest assessment free?

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

### Is STEMulator free?

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

### Do onetest assessment or STEMulator have ads?

Neither onetest assessment nor STEMulator shows ads.

### Which is updated more often, onetest assessment or STEMulator?

onetest assessment ships an update every 14 months, and STEMulator every 9 months. Most recently, onetest assessment was updated on September 9, 2026 and STEMulator on May 19, 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.*