# techSampler vs AVR Projects

The clearest difference is update cadence: AVR Projects at daily against techSampler's every 4 months. techSampler's advantage is iOS requirement (7.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. techSampler sells 1 one-off in-app purchase and AVR Projects sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

techSampler ships an update every 4 months, AVR Projects daily. The most recent releases landed on September 4, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | techSampler | AVR Projects |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 38 MB | 20 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) | [Zaw Win Myat](https://appshunter.io/developer/1800881321) |

## 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 |


### AVR Projects

[App page](https://appshunter.io/ios/app/avr-projects/id6745124011)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| R2R Ladder DAC | $0.99 | one-time |
| Sawtooth Waveform | $0.99 | one-time |
| Triangular Waveform | $0.99 | one-time |
| Sine Waveform | $0.99 | one-time |
| Ammeter AVR | $0.99 | one-time |
| 4x3 Matrix Keypad | $0.99 | one-time |
| Ohm Meter AVR | $0.99 | one-time |
| Voltmeter AVR | $0.99 | one-time |
| TM1637 Interfacing with AVR | $0.99 | one-time |
| Graphic LCD Interfacing | $0.99 | one-time |


## Frequently asked questions

### Is techSampler free?

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

### Is AVR Projects free?

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

### Do techSampler or AVR Projects have ads?

Neither techSampler nor AVR Projects shows ads.

### Which is updated more often, techSampler or AVR Projects?

techSampler ships an update every 4 months, and AVR Projects daily. Most recently, techSampler was updated on September 4, 2026 and AVR Projects on September 9, 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.*