# Wastewater Map vs MPP File Viewer

The clearest difference is rating: Wastewater Map at 5.0 against MPP File Viewer's 1.0. Wastewater Map also leads on in-app purchases (none vs 4) and iOS requirement (9.0 vs 17.0). MPP File Viewer's advantage is update cadence (every 6 days vs every 3 months) and device support (4 vs 1). On price, ratings volume and ads there is nothing between them.

Both are free to download. MPP File Viewer sells 4 in-app purchases, starting at $5.99 per month. Wastewater Map asks for nothing beyond the download.

Wastewater Map holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Wastewater Map ships an update every 3 months, MPP File Viewer every 6 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Wastewater Map | MPP File Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/wastewater-map/id1455352632/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/mpp-file-viewer-gantt-chart/id6799043030/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 237 MB | 13 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPad | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [BELZONA, INC.](https://appshunter.io/developer/1050205709) | [EUTOPIX LABS](https://appshunter.io/developer/1896294696) |

## What reviewers say

### Wastewater Map

[App page](https://appshunter.io/ios/app/wastewater-map/id1455352632)

Explore a sample wastewater plant and learn about its areas and equipment. Discover common problems and potential solutions using advanced polymeric technology. This interactive map helps users understand wastewater plant challenges and how to address them.

**Highlights:** Interactive wastewater plant navigation, Detailed area and equipment descriptions, Identification of typical problems, Presentation of potential solutions, Learning about polymeric technology applications

**Features:** macOS Compatibility

**In-app purchases:** none


### MPP File Viewer

[App page](https://appshunter.io/ios/app/mpp-file-viewer-gantt-chart/id6799043030)

View and inspect Gantt charts, tasks, and resources from Microsoft Project and Primavera P6 schedule files on your Apple devices. Export project information as PDF or CSV for easy sharing. Files are processed locally for privacy.

**Highlights:** Open MPP, MPT, MSPDI, XER, P6 XML, and MPX files, Inspect Gantt charts, tasks, and resources, Browse task hierarchy, Navigate pinch-to-zoom Gantt timeline, Export as PDF or CSV, Print Gantt charts

**Features:** Family Sharing, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GanttPeek Pro (Monthly) | $5.99 | per month |
| GanttPeek Pro (Yearly) | $19.99 | per year |
| GanttPeek Pro 7-Day Pass | $4.99 | one-time |
| GanttPeek Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Wastewater Map free?

Wastewater Map is free to download, with no in-app purchases.

### Is MPP File Viewer free?

MPP File Viewer is free to download, with in-app purchases available.

### Which has better reviews, Wastewater Map or MPP File Viewer?

Wastewater Map is rated higher. Wastewater Map averages 5.0 out of 5 from 1 ratings, while MPP File Viewer averages 1.0 from 1 ratings.

### Do Wastewater Map or MPP File Viewer have ads?

Neither Wastewater Map nor MPP File Viewer shows ads.

### Which is updated more often, Wastewater Map or MPP File Viewer?

Wastewater Map ships an update every 3 months, and MPP File Viewer every 6 days. Most recently, Wastewater Map was updated on November 2, 2026 and MPP File Viewer on October 31, 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.*