# Gantt Viewer vs Estimatis

The clearest difference is price: Gantt Viewer at Free against Estimatis's $3.99. Gantt Viewer also leads on iOS requirement (8.0 vs 13.0). Estimatis's advantage is rating (2.0 vs 1.0) and in-app purchases (none vs 1). On review sentiment, ratings volume, update cadence and ads there is nothing between them.

Gantt Viewer is free to download; Estimatis costs $3.99 up front. Gantt Viewer sells 1 one-off in-app purchase. Estimatis asks for nothing beyond the download.

Estimatis holds the better App Store score, 2.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

Gantt Viewer ships an update every 5 months, Estimatis every 7 months. The most recent releases landed on October 8, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Gantt Viewer | Estimatis |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/gantt-viewer/id654944245/reviews) | **[2.0 (1 ratings)](https://appshunter.io/ios/app/estimatis/id1525137772/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 7 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 17 MB | 2 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Artezio LLC](https://appshunter.io/developer/595916023) | [DlhSoft SRL](https://appshunter.io/developer/1456344128) |

## What reviewers say

### Gantt Viewer

[App page](https://appshunter.io/ios/app/gantt-viewer/id654944245)

This application allows users to view Microsoft Project files on their mobile devices. It supports various project views, including Gantt charts and resource usage, with intuitive touch gestures for navigation. Projects can be added from external sources like email and cloud storage.

**Highlights:** View Microsoft Project files (MPP/MPPX), Gantt Chart, Resource Usage, Task Usage views, Touch-based navigation with gestures, Add projects from Email, Dropbox, etc., Direct access from cloud storage

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gantt Viewer full version | Free | one-time |


### Estimatis

[App page](https://appshunter.io/ios/app/estimatis/id1525137772)

This app allows users to create project estimates by defining tasks, effort, and parallel work. It visualizes results in a Gantt chart and can export data. It also incorporates risk assessment for more accurate duration calculations.

**Highlights:** Task definition with effort estimation, Parallel work identification, Gantt chart visualization, Data export to clipboard, Internal risk percentage setting, Offline functionality, On-device computation for privacy

**In-app purchases:** none


## Frequently asked questions

### Is Gantt Viewer free?

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

### Is Estimatis free?

Estimatis costs $3.99, with no in-app purchases.

### Which has better reviews, Gantt Viewer or Estimatis?

Estimatis is rated higher. Gantt Viewer averages 1.0 out of 5 from 2 ratings, while Estimatis averages 2.0 from 1 ratings.

### Do Gantt Viewer or Estimatis have ads?

Neither Gantt Viewer nor Estimatis shows ads.

### Which is updated more often, Gantt Viewer or Estimatis?

Gantt Viewer ships an update every 5 months, and Estimatis every 7 months. Most recently, Gantt Viewer was updated on October 8, 2026 and Estimatis on October 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*