Comparison

iProject Viewer vs GanttPRO

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

Head to head
About

iProject Viewer

View, edit, and create Microsoft Project plans on your iOS device. Access files from cloud storage and email, with advanced editing and viewing options available through in-app purchases.

Highlights
  • Open MS Project files from cloud storage
  • Create new Gantt charts
  • Edit and save existing MS Project plans
  • View Gantt, Task, and Resource Sheets
  • Advanced sorting and filtering
  • Network Diagram view
  • Print project info to PDF
Features
Read full description

New!! Create Gantt charts and edit/save existing MS Project Plans in MPP file format! Housatonic’s Project Viewer 365 for iOS allows you to open MS Project Plans from cloud locations like Google Drive. Dropbox, OneDrive, SharePoint Online, Box, Basecamp, URL Links and email attachments.

 Housatonic Project Viewer 365 for iOS is compatible with Microsoft Project (MPP file format) 2024, 2021, 2019, 2016, 2013, 2010, 2007, 2003 and earlier versions. The interface is intuitive making Project Viewer simple for the end users.

 Now Microsoft Project Plans look better than ever on your iOS. Free view-only MS Project views like Gantt chart, Task Sheet and Resource Sheet are available along with basic project plan sorting, filters, zooming and time scale viewing capabilities.

 Additional features can be enabled by subscribing to in-app-purchase packages: In-App Option 1: Advanced View Only Enable advanced sorting capabilities, apply additional filter options, customize time scale 
Access additional project views like Calendar View, Resource and Task Usage, View Network Diagram
 View Multiple Project Reports and Print Project Info to PDF or Paper
 This in-app purchase option is offered on a yearly (1 year) basis for a price of $19.99 USD per year. In-App Option 2: Standard Editor Create new Gantt charts and modify existing project schedules in the same intuitive way as MS Project. Save and Share your plans (MPP files) from any storage or cloud location on any iOS device. Works with, or as an alternative to Microsoft Project. This in-app purchase option is offered on a yearly (1 year) basis for a price of $129.99 USD per year. Payment will be charged to iTunes Account at confirmation of purchase Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase No cancellation of the current subscription is allowed during active subscription period Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Terms and Conditions: http://housatonic.com/terms.html Privacy Policy: http://housatonic.com/privacy.html

About

GanttPRO

Manage projects and collaborate with your team on the go. This tool allows for task creation, time tracking, and real-time notifications to keep everyone informed and organized. It's an extension of the web-based platform for convenient mobile access.

Highlights
  • Gantt chart creation
  • Task management
  • Team collaboration
  • Time tracking
  • Push notifications
  • Resource assignment
Read full description

Keep track of your project at the workplace or on the go with GanttPRO, a powerful Gantt chart tool for project and resource management and team collaboration. Join the company of more than 600,000 registered users and realize why CEOs, team leads, project managers, and business owners rely on our intuitive and robust software. Please note that the mobile app is just an additional opportunity to manage tasks and receive notifications on the go for users registered in the Web-based GanttPRO tool. To get started, make sure you have an account there before you download the app. With the GanttPRO app, you can: • MANAGE TASKS Easily create tasks, set start and due dates, define statuses, clarify priorities, and even filter assignments. • COLLABORATE WITH YOUR TEAM Collaborate on tasks with your team: assign resources, add task descriptions, attachments, and comments to provide even the smallest details. • TRACK TIME SPENT ON TASKS Log time spent on tasks for precise management at the workplace, in the field, or anywhere in between. • STAY INFORMED AND ORGANIZED, WHEREVER YOU ARE Turn on push notifications and get immediate information about your tasks. Stay updated about their start, end dates, and deadlines; when someone from your team mentions you, comments on your tasks, and attaches files to them. To get advantages of the mobile app, please, create an account in the Web version beforehand.

Screenshots

iProject Viewer4 screens
GanttPRO4 screens

Verdict

The call

The clearest difference is rating: GanttPRO at 5.0 against iProject Viewer's 3.7. GanttPRO also leads on in-app purchases (none vs 2). iProject Viewer's advantage is ratings volume (17 vs 3) and device support (3 vs 1). On price, review sentiment, 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

Both are free to download. iProject Viewer sells 2 in-app purchases, starting at $19.99 per year. GanttPRO asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

GanttPRO holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: iProject Viewer has 17 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 26% of iProject Viewer's written reviews are positive against 33% of GanttPRO's.

UpkeepUpdate frequency

iProject Viewer ships an update every 3 months, GanttPRO every 2 months. The most recent releases landed on August 24, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
iProject Viewer versus GanttPRO: the parameters behind the verdict, then further details
ParameteriProject ViewerGanttPRO
PriceFreeFree
Rating3.7 (17 ratings)5.0 (3 ratings) — better
Positive reviews26.0% of reviews33.3% of reviews — better
Number of ratings17 — better3
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better15.1
Further details — not scored
Size95 MB21 MB
Age rating4+4+
DeveloperHousatonic.comDPM SOLUTIONS SP Z O O

Customer experience

iProject Viewer

All ratings17 ratings
Positive64.7%
Neutral5.9%
Negative29.4%
Written reviews50 reviews
Positive26.0%
Neutral16.0%
Negative58.0%

GanttPRO

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

In-app purchases

2 purchases

iProject Viewer

Subscriptions2
  • Advanced View-Only1 Month trial$19.991 Year
  • Standard Editor1 Month trial$129.991 Year
None

GanttPRO

No in-app purchases

Questions

Is iProject Viewer free?
iProject Viewer is free to download, with in-app purchases available.
Is GanttPRO free?
GanttPRO is free to download, with no in-app purchases.
Which has better reviews, iProject Viewer or GanttPRO?
GanttPRO is rated higher. iProject Viewer averages 3.7 out of 5 from 17 ratings, while GanttPRO averages 5.0 from 3 ratings.
Do iProject Viewer or GanttPRO have ads?
Neither iProject Viewer nor GanttPRO shows ads.
Which is updated more often, iProject Viewer or GanttPRO?
iProject Viewer ships an update every 3 months, and GanttPRO every 2 months. Most recently, iProject Viewer was updated on August 24, 2026 and GanttPRO on June 1, 2026.

Other comparisons