Comparison

Quota (Dualog) vs iVSP

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

Head to head
About

Quota (Dualog)

This app allows ship crew to manage their onboard internet access. It provides real-time usage tracking, allows purchasing additional data, and offers data-saving features for a fair and user-friendly experience.

Highlights
  • Real-time data and time usage tracking
  • Cross-device internet access management
  • In-app data top-ups
  • Data-saving alerts and tips
  • Automatic ship Wi-Fi detection for login
  • Daily breakdowns by carrier
Features
Read full description

The Dualog Quota app helps crew manage their internet access onboard in a secure, fair, and user-friendly way. Quota replaces Dualog’s Crew Connection app, which was previously used to manage internet quotas onboard. With a modern, mobile-friendly design, Quota makes it easier than ever for the crew to stay in control. What you can do with the Quota app: - Track your usage in real time See how much data or time you’ve used, how much is left, and get daily breakdowns by carrier like Starlink, VSAT, or 4G. - Use the internet across all your devices Manage access on multiple devices under the same account. Works smoothly on mobile and tablet via the app, or on desktop through the web interface. - Top up when you need to Run out of your free allowance? Buy more data directly in the app, no need to ask IT or the captain. - Stay in control with data-saving features Get alerts when usage is high and tips for reducing consumption, so you don’t run out unexpectedly. - Enjoy hassle-free logins The app detects the ship’s Wi-Fi automatically, making logins faster and more reliable. Built for the realities of ship life The service works with any internet provider or carrier, requires no local admin for everyday use, and integrates with Dualog’s proven internet control and security tools. Reliable and fair internet access is now an essential part of crew welfare. With Quota, you gain more transparency, more control, and the freedom to stay connected with family and friends, while helping ship operators keep networks secure and costs under control.

About

iVSP

Experience ship navigation with Voith propulsion systems. Explore the mechanics and hydrodynamics of Voith Schneider Propellers (VSP) and their unique thrust capabilities on various vessel types. Learn about the innovative technology behind this propulsion system.

Highlights
  • Steer ships with Voith propulsion
  • Explore Voith Schneider Propeller mechanics
  • Understand VSP hydrodynamics
  • Simulate various vessel types
  • Learn about VSP thrust generation
Features
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The iVSP app allows users to steer ships equipped with Voith propulsion systems, in particular Voith Schneider Propeller (VSP). These are real ships of various types: Voith Water Tractors (tugs), double-ended ferries, offshore vessels, and yachts. iVSP also provides a deeper insight into the mechanics and hydrodynamics of the Voith Schneider Propeller (VSP) and its unique propeller forces. The VSP enables the fastest generation of thrust in all directions – stepless and precisely. VSPs combine propulsion, steering, and roll stabilization in a single unit, eliminating the need for rudders. Thrust and steering forces can be generated in any direction from zero to maximum. The Voith Schneider Propeller generates thrust by means of profiled blades that protrude from the ship's bottom and rotate around a vertical axis. The blades are mounted in a rotor casing that is flush with the ship's bottom. The rotational movement of the blades around the common vertical axis is superimposed by a local oscillatory movement of the individual propeller blades around their own axis. This oscillatory movement is generated by a kinematic mechanism (kinematics). The Voith Schneider Propeller is based on an idea by Austrian inventor Ernst Schneider, and its effectiveness was first successfully demonstrated in model tests in 1926. The development potential of the VSP is far from exhausted, and Voith engineers are continuously working to further improve its efficiency. In addition, the company is constantly developing new applications for various types of ships for this unique propulsion system. Suggestions for the application and further improvement of the VSP are always welcome. The relevant contact details for Voith can be found in the main menu of iVSP.

Screenshots

Quota (Dualog)4 screens
iVSP4 screens

Verdict

The call

The clearest difference is review sentiment: iVSP at 100% against Quota (Dualog)'s 2%. iVSP also leads on monetization model (free vs free with in-app purchases) and iOS requirement (13.0 vs 16.4). Quota (Dualog)'s advantage is update cadence (every 2 months vs every 21 months). On price, ads, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Quota (Dualog) ships an update every 2 months, iVSP every 21 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard4 real differences · 6 level
Quota (Dualog) versus iVSP: the parameters behind the verdict, then further details
ParameterQuota (Dualog)iVSP
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews2.4% of reviews100.0% of reviews — better
Number of ratings—1 — better
Update frequencyEvery 2 months — betterEvery 21 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS16.413.0 — better
Further details — not scored
Size47 MB384 MB
Age rating4+4+
DeveloperDualog ASVoith Digital Solutions Inc

Customer experience

Quota (Dualog)

Written reviews41 reviews
Positive2.4%
Neutral4.9%
Negative92.7%

iVSP

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Quota (Dualog)

No in-app purchases

None

iVSP

No in-app purchases

Questions

Is Quota (Dualog) free?
Quota (Dualog) is free to download, with no in-app purchases.
Is iVSP free?
iVSP is free to download, with no in-app purchases.
Do Quota (Dualog) or iVSP have ads?
Neither Quota (Dualog) nor iVSP shows ads.
Which is updated more often, Quota (Dualog) or iVSP?
Quota (Dualog) ships an update every 2 months, and iVSP every 21 months. Most recently, Quota (Dualog) was updated on November 6, 2026 and iVSP on November 2, 2026.

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