Comparison

iVSP vs HSA

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

Head to head
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
Read full description

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.

About

HSA

Features
Read full description

After connecting App to Car Amplifier with Integrated DSP,  EQ, BASS, TIME ALIGNMENT, PHASE, MUTE, FILTER , SAVE SOUND SETTING TO PHONE, SAVE SOUND SETTING TO AMPLIFIER, LOAD SOUND SETTING FROM PHONE, RCA OUTPUT etc could be controlled through this App. How to use: 1.Install App and turn on power of car 2. Turn on Bluetooth on your iPhone 3,Open App and wait for around 5 seconds, then click “Connect” icon in left corner of bottom. Amplifier will be connected to App automatically. 4.DIY you preferred sound and then click “Save to AMP” icon to save. Or click “ Save to Phone” to save.   Note: 1.Do not exit app during saving and do not turn off power supply, program may be shut down caused by this.

Screenshots

iVSP4 screens
HSA4 screens

Verdict

The call

The clearest difference is update cadence: HSA at every 2 months against iVSP's every 21 months. HSA also leads on iOS requirement (9.0 vs 13.0). 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

iVSP ships an update every 21 months, HSA every 2 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

Scorecard2 real differences · 8 level
iVSP versus HSA: the parameters behind the verdict, then further details
ParameteriVSPHSA
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 21 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.09.0 — better
Further details — not scored
Size384 MB6 MB
Age rating4+4+
DeveloperVoith Digital Solutions Inc杏生 卢

In-app purchases

None

iVSP

No in-app purchases

None

HSA

No in-app purchases

Questions

Is iVSP free?
iVSP is free to download, with no in-app purchases.
Is HSA free?
HSA is free to download, with no in-app purchases.
Do iVSP or HSA have ads?
Neither iVSP nor HSA shows ads.
Which is updated more often, iVSP or HSA?
iVSP ships an update every 21 months, and HSA every 2 months. Most recently, iVSP was updated on October 15, 2026 and HSA on October 13, 2026.

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