# QQPIECHART vs Debris Optics

The clearest difference is in-app purchases: Debris Optics at none against QQPIECHART's 3. QQPIECHART's advantage is update cadence (every 3 weeks vs every 3 months) and iOS requirement (13.4 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. QQPIECHART sells 3 in-app purchases, starting at $4.99 per month. Debris Optics asks for nothing beyond the download.

QQPIECHART ships an update every 3 weeks, Debris Optics every 3 months. The most recent releases landed on June 11, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | QQPIECHART | Debris Optics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/qqpiechart/id6618156890/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 36 MB | 105 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [QQ Pie Inc](https://appshunter.io/developer/1761844154) | [Volkert, Inc.](https://appshunter.io/developer/1778251051) |

## What reviewers say

### QQPIECHART

[App page](https://appshunter.io/ios/app/qqpiechart/id6618156890)

This tool converts quantitative probability values from complaints or nonconformities into qualitative probability values for risk analysis. It supports PHA and FMEA risk record assessments.

**Highlights:** Quantitative to qualitative probability conversion, Supports PHA risk analysis, Supports FMEA risk analysis, Converts percentages and decimals, Outputs qualitative values 1 through 5

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Plan | $4.99 | per month |
| Premium Plan | $9.99 | per month |
| Premium Annual Plan | $99.99 | per year |


### Debris Optics

[App page](https://appshunter.io/ios/app/debris-optics/id6737845219)

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

**In-app purchases:** none


## Frequently asked questions

### Is QQPIECHART free?

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

### Is Debris Optics free?

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

### Do QQPIECHART or Debris Optics have ads?

Neither QQPIECHART nor Debris Optics shows ads.

### Which is updated more often, QQPIECHART or Debris Optics?

QQPIECHART ships an update every 3 weeks, and Debris Optics every 3 months. Most recently, QQPIECHART was updated on June 11, 2026 and Debris Optics on September 13, 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.*