# Engineering 8D vs Reliability Pro

The clearest difference is price: Reliability Pro at Free against Engineering 8D's $4.99. Reliability Pro also leads on update cadence (every 4 days vs every 3 months) and device support (3 vs 1). Engineering 8D's advantage is in-app purchases (none vs 2). On ads there is nothing between them.

Reliability Pro is free to download; Engineering 8D costs $4.99 up front. Reliability Pro sells 2 in-app purchases, starting at $14.99 per month. Engineering 8D asks for nothing beyond the download.

Engineering 8D ships an update every 3 months, Reliability Pro every 4 days. The most recent releases landed on September 21, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Engineering 8D | Reliability Pro |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/reliability-pro/id6782085318/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | — | Subscription |
| Size | 12 MB | 75 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STI](https://appshunter.io/developer/914295588) | [Illayathambi Kunadian](https://appshunter.io/developer/6782085321) |

## What reviewers say

### Engineering 8D

[App page](https://appshunter.io/ios/app/engineering-8d/id1035570380)

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

**In-app purchases:** none


### Reliability Pro

[App page](https://appshunter.io/ios/app/reliability-pro/id6782085318)

This app offers a comprehensive suite of over 75 professional tools for reliability, quality, and statistics analysis. It includes advanced features like life-data analysis, system modeling, and SPC control charts, all accessible on mobile devices with step-by-step tutorials and an AI assistant.

**Highlights:** 75+ reliability, quality, and statistics tools, AI assistant for tool discovery, Step-by-step video tutorials, Reference library with theory and formulas, Data import and export (PDF, text), Verified tools against industry standards

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reliability Pro Monthly | $14.99 | per month |
| Reliability Pro Annual | $99.99 | per year |


## Frequently asked questions

### Is Engineering 8D free?

Engineering 8D costs $4.99, with no in-app purchases.

### Is Reliability Pro free?

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

### Do Engineering 8D or Reliability Pro have ads?

Neither Engineering 8D nor Reliability Pro shows ads.

### Which is updated more often, Engineering 8D or Reliability Pro?

Engineering 8D ships an update every 3 months, and Reliability Pro every 4 days. Most recently, Engineering 8D was updated on September 21, 2026 and Reliability Pro on October 5, 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.*