Comparison

Gantt Viewer vs Estimatis

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gantt Viewer

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
Read full description

Gantt Viewer is a professional viewer app for Microsoft Project (MPP/MPX) files. The app can easily display small and large project files. Gantt Viewer provides many useful views including tasks, resources, gantt chart and work. The app was developed for touch-based navigation and provides many useful gestures. List of features: * Projects - add projects from external apps like Email, DropBox and other. Keep your favorite projects in the app and view them any time. * Views - display project data in Gantt Chart, Resource Usage and Task Usage views. * Gestures - there are many useful gestures to navigate project data, change view mode and time scale, get details about tasks and resources. * Formats - Gantt Viewer works with the most of the Microsoft Projects (MPP/MPPX) formats. * DropBox - login with your DropBox account and open projects directly from your online storage. Gantt Viewer was developed to let people be more mobile especially when they need to work with their projects and can not spend time at the office.

About

Estimatis

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
Read full description

Create high-level estimates for your new projects even when you are away: define a set of tasks (envisioned, for example, by analyzing a request received from a customer), specify their estimated effort values, identify and mark the work items that may be parallelized to the ones above, optionally set up your hour rate amount, and you're done: view immediate results in the Gantt chart tab. You can also use the Copy values command from the context menu of the estimation values section to copy them as tab separated values directly to clipboard (and from there to your desired destination app, such as for backup purposes or simply to reply to your customer, providing the project duration and cost estimation that they have asked for.) Optionally, you can also set an internal risk percent besides the tasks themselves (for example, if you think that you may run into unexpected delays while performing the necessary work during the project): this will decrease the resource allocation units used upon task scheduling and therefore it would enlarge the estimated duration accordingly, without increasing the billable hour count or the total cost of the project. Note that everything is computed directly on your device to maximize privacy, and to run offline whenever needed too.

Screenshots

Estimatis2 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Gantt Viewer versus Estimatis: the parameters behind the verdict, then further details
ParameterGantt ViewerEstimatis
PriceFree — better$3.99
Rating1.0 (2 ratings)2.0 (1 ratings) — better
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 5 months — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPadiPhone, iPad, iPod, Mac — better
Requires iOS8.0 — better13.0
Further details — not scored
Size17 MB2 MB
Age rating4+4+
DeveloperArtezio LLCDlhSoft SRL

Customer experience

Gantt Viewer

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Estimatis

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Gantt Viewer

One-time1
  • Gantt Viewer full versionFree
None

Estimatis

No in-app purchases

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.

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