# Reliability of systems vs AVR Projects

The clearest difference is update cadence: AVR Projects at daily against Reliability of systems's every 18 months. Reliability of systems's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Reliability of systems 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.

Reliability of systems ships an update every 18 months, AVR Projects daily. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Reliability of systems | AVR Projects |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 18 months | **Daily** |
| Size | 4 MB | 20 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Zaw Win Myat](https://appshunter.io/developer/1800881321) |

## What reviewers say

### Reliability of systems

[App page](https://appshunter.io/ios/app/reliability-of-systems/id6443837301)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro feature | $1.99 | 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 Reliability of systems free?

Reliability of systems 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 Reliability of systems or AVR Projects have ads?

Neither Reliability of systems nor AVR Projects shows ads.

### Which is updated more often, Reliability of systems or AVR Projects?

Reliability of systems ships an update every 18 months, and AVR Projects daily. Most recently, Reliability of systems was updated on October 10, 2026 and AVR Projects on October 25, 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.*