# techSampler vs arduinoSG90

The clearest difference is in-app purchases: arduinoSG90 at none against techSampler's 1. arduinoSG90 also leads on update cadence (daily vs every 4 months). techSampler's advantage is iOS requirement (7.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. techSampler sells 1 one-off in-app purchase. arduinoSG90 asks for nothing beyond the download.

techSampler ships an update every 4 months, arduinoSG90 daily. The most recent releases landed on September 4, 2026 and December 4, 2025 respectively.

## The numbers

| Metric | techSampler | arduinoSG90 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/techsampler/id626214040/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 38 MB | 3 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Byte Works, Inc.](https://appshunter.io/developer/286319447) | [YASUYUKI INUKAI](https://appshunter.io/developer/689779927) |

## What reviewers say

### techSampler

[App page](https://appshunter.io/ios/app/techsampler/id626214040)

Explore dozens of free, standalone apps with complete source code for electronics, science, math, and graphics. This companion app to a popular book provides executable projects and programming tools for iPhone and iPad.

**Highlights:** Free standalone apps with source code, Electronics and sensor projects, Data collection and analysis, Interactive graphics and programming, Companion to O'Reilly book, Built-in help and debugger, STEM education tools

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add Editing | $14.99 | one-time |


### arduinoSG90

[App page](https://appshunter.io/ios/app/arduinosg90/id6482847820)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is techSampler free?

techSampler is free to download, with in-app purchases available.

### Is arduinoSG90 free?

arduinoSG90 is free to download, with no in-app purchases.

### Do techSampler or arduinoSG90 have ads?

Neither techSampler nor arduinoSG90 shows ads.

### Which is updated more often, techSampler or arduinoSG90?

techSampler ships an update every 4 months, and arduinoSG90 daily. Most recently, techSampler was updated on September 4, 2026 and arduinoSG90 on December 4, 2025.

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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.*