Comparison

iVSP vs Timesewn Mobile

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

Timesewn Mobile

This app helps you manage time zones for alarms, world clocks, and event planning. It converts times from any app, sets alarms in destination time zones, and provides live updates for global locations. Pro features include advanced planning and counter options.

Highlights
  • Time zone conversion from any app
  • Alarms set for destination time zones
  • Live world clocks with sunrise/sunset
  • Daylight saving time alerts
  • Countdown timers with alarms
  • Network time server synchronization
  • Home screen and watch widgets
Features
Read full description

Timesewn is an alarm clock, world clock, countdown and time hack that actually understands time zones. No account, no ads, no tracking. Free to download, and Timesewn Pro, one optional purchase, unlocks everything. CONVERT A TIME FROM ANY APP Someone writes "3pm EST" or "noon Tokyo on Friday"? Select it, tap Share, then Convert with Timesewn, and see that moment in your time and in each of your cities. Start a counter or set an alarm right from there. (Timesewn Pro) ALARMS IN ANY TIME ZONE Set a wake-up time in your destination's time zone and let Timesewn do the math. A live preview shows exactly when it will ring in your local time, so an early call abroad is never a surprise. Every alarm carries a label and a countdown, repeating alarms set for another city ring at that city's local time, and alarms ring even on silent, powered by Apple's AlarmKit. Traveling? When your time zone changes, Timesewn asks whether your repeating alarms should stay put or move with you. WORLD CLOCKS Live times for every place you care about, with your own time always on top. Press and hold to drag the rest into any order. Tap a city for its sunrise, sunset, working hours and next clock change, and get a heads-up a week before any of your cities switches to or from daylight saving time. Turn on the world map to see every city with the night side shaded. Type a time in plain words, like "5pm Tokyo", and see it in every city at once. With Timesewn Pro, your next calendar event shows at the top of Clocks with its start time in each city; your events stay on your iPhone. PLAN A TIME Slide the planner and every clock follows, with day badges when a city crosses midnight. Copy a city's time, or every city's at once, ready to paste into a chat. With Timesewn Pro, share the moment as a card or text, and the Overlap view lines up each city's working day so the hours everyone shares stand out, and a tap plans the meeting. COUNTERS Count down to a moment in any time zone, or count up from one that has passed, and sound an alarm at zero. With Timesewn Pro, record timestamps as you go with the gap between each one, export them as a CSV file, and start from a template: Deadline, Launch Day, Days Since, Streak or Trip. TIME HACK Set your watch to the second. The Hack tab shows the exact time from a network time server, re-synced every two minutes, and counts down to the top of every minute with a tap and a beep for the last five seconds. It shows how long ago it synced and how far off your iPhone's clock is, in your own time zone or any city you choose. ON YOUR WRIST AND YOUR HOME SCREEN With Timesewn Pro, Timesewn on Apple Watch shows your clocks, counters and alarms, with complications for your watch face, and records a timestamp with a tap. Widgets put your world clocks, a counter or your next alarm on the Home Screen, Lock Screen and StandBy. Siri and Shortcuts are there too, a Focus filter shows only the cities that matter right now, and you can pick one of four app icons. FREE, OR EVERYTHING WITH TIMESEWN PRO Free: your own clock and 3 cities, 2 alarms, 1 counter, the world map, the Plan slider, city details, Time Hack and iCloud sync. Timesewn Pro, a one-time purchase, unlocks everything marked Timesewn Pro above, plus unlimited cities, alarms and counters and Timesewn's own alarm sounds. Family Sharing is supported. If you bought Timesewn before, Pro is already yours. Catching an early flight, joining a call with another continent, keeping tabs on family overseas, setting your watch before a big day: Timesewn keeps you on time, everywhere. Made the Adventure Apps way: • Free to start, one optional purchase. No subscription, no ads. • No account, no tracking. Your alarms and calendar stay on your iPhone and Apple Watch; your clocks and counters sync with Timesewn on Mac through your own iCloud, never through us. • Small, fast, native. • In English, German, Spanish, French, Italian, Japanese and Korean.

Screenshots

iVSP4 screens
Timesewn Mobile4 screens

Verdict

The call

The clearest difference is in-app purchases: iVSP at none against Timesewn Mobile's 1. iVSP also leads on iOS requirement (13.0 vs 26.0). Timesewn Mobile's advantage is update cadence (daily vs every 21 months) and ratings volume (3 vs 1). On price, rating, review sentiment 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. Timesewn Mobile sells 1 one-off in-app purchase. iVSP asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for iVSP against 5.0 for Timesewn Mobile. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

iVSP ships an update every 21 months, Timesewn Mobile daily. The most recent releases landed on November 2, 2026 and November 1, 2026 respectively.

Scorecard5 real differences · 5 level
iVSP versus Timesewn Mobile: the parameters behind the verdict, then further details
ParameteriVSPTimesewn Mobile
PriceFreeFree
Rating5.0 (1 ratings)5.0 (3 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings13 — better
Update frequencyEvery 21 monthsDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS13.0 — better26.0
Further details — not scored
Size384 MB24 MB
Age rating4+4+
DeveloperVoith Digital Solutions IncAdventure Apps, LLC

Customer experience

iVSP

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

Timesewn Mobile

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

iVSP

No in-app purchases

1 purchases

Timesewn Mobile

One-time1
  • Timesewn Pro$2.99

Questions

Is iVSP free?
iVSP is free to download, with no in-app purchases.
Is Timesewn Mobile free?
Timesewn Mobile is free to download, with in-app purchases available.
Which has better reviews, iVSP or Timesewn Mobile?
iVSP and Timesewn Mobile are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.
Do iVSP or Timesewn Mobile have ads?
Neither iVSP nor Timesewn Mobile shows ads.
Which is updated more often, iVSP or Timesewn Mobile?
iVSP ships an update every 21 months, and Timesewn Mobile daily. Most recently, iVSP was updated on November 2, 2026 and Timesewn Mobile on November 1, 2026.

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