# Reliability of systems

> Reliability of systems (iPhone/iPad app by Siu Yuen Ho.)

- Source: https://appshunter.io/ios/app/reliability-of-systems/id6443837301 (this page in markdown: same URL + `.md`)
- Developer: [Siu Yuen Ho](https://appshunter.io/developer/814088527)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 4 MB
- Languages: American English, French (France), German (Germany), Italian, European Portuguese, Russian, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2022-10-15
- Data updated: 2026-08-29
- User reviews in markdown: https://appshunter.io/ios/app/reliability-of-systems/id6443837301/reviews.md

## What is Reliability of systems?

This app is a tool for calculating reliability. It is suitable for hobbyist, students or engineers.

Features
• Mean-Time-Between-Failure (MTBF) calculator
• Reliability of series systems
• Reliability of parallel systems
• Reliability function

Features in PRO
• Reliability of mixed systems

All trade names mentioned in this app or the other documentation provided by this app are trademarks or registered trademarks of their respective holder. This app is not related or affiliated in any way these companies.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Pro feature | $1.99 | one-time |



## Version history (last 2 releases)

### 1.0.05 — 2024-03-25

Fix minor bugs

### 1.0.00 — 2022-10-15

No release notes.

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## More apps by Siu Yuen Ho

- [Easy Ohm's Law](https://appshunter.io/ios/app/easy-ohms-law/id814088524)
- [RC Circuit Pro](https://appshunter.io/ios/app/rc-circuit-pro/id824145786)
- [RC Circuit](https://appshunter.io/ios/app/rc-circuit/id824460716)
- [Resistor Tools Pro](https://appshunter.io/ios/app/resistor-tools-pro/id825620924)
- [Resistor Tools](https://appshunter.io/ios/app/resistor-tools/id826045228)
- [Timer 555 Calculator Pro](https://appshunter.io/ios/app/timer-555-calculator-pro/id833443125)

All apps by Siu Yuen Ho: https://appshunter.io/developer/814088527

## Related topics

[reliability](https://appshunter.io/ios/topics/reliability) · [reliability of systems](https://appshunter.io/ios/topics/reliability-of-systems) · [reliability pro](https://appshunter.io/ios/topics/reliability-pro) · [reliability analysis](https://appshunter.io/ios/topics/reliability-analysis)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*