Comparison

SHv4 Calculator vs Tech

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

Head to head
About

SHv4 Calculator

Calculate your vehicle's speedometer error and get setup instructions for a SpeedoHealer module. This free, ad-free tool helps correct inaccurate speed and odometer readings on most motorcycles and some cars. It offers troubleshooting information and is compatible with non-cable driven speedometers.

Highlights
  • Calculate speedometer error
  • Generate SpeedoHealer v4 setup instructions
  • Access troubleshooting information
  • Ad-free experience
  • Offline functionality
  • Compatible with most motorcycles and cars
Read full description

Use this free application to calculate the speedometer error of your vehicle and generate setup instructions for your SpeedoHealer v4 module. You can also access troubleshooting information. After installation, it does not use internet connection, it's Ad-free. On most modern motorcycles, with factory speedometer error being as high as 10%, even a modest sprocket gearing change can have the speedometer off by 15%. The sprocket change will also cause higher odometer reading, creating a negative resale factor for no valid reason. The SpeedoHealer is an inexpensive, convenient and very simple way to fix your speedo and odo. Compatible with all motorcycles with non cable driven speedometer. Plug 'n go SH kits are available for selected Harley, Honda, Hyosung, Buell, Ducati, Kawasaki, KTM, Suzuki, Triumph and Yamaha motorcycles. The SpeedoHealer can also be installed on cars which have a 2- or 3-wire speed sensor. Please check out our website for other cool and useful products for your motorcycle.

About

Tech

Easily register and monitor your motorcycle airbag system's status and battery life. Track ride details, record location and speed, and relive your journeys with detailed maps and statistics. Build a library of your rides and manage system settings.

Highlights
  • Register Tech-Air® 5 Airbag System
  • Monitor system status and battery life
  • Track ride details with location and speed
  • Record and visualize ride statistics
  • Build a library of recorded rides
  • Disable system for off-road riding
  • Update system firmware
Features
Read full description

Packed with a variety of useful features, the App lets you easily register your Tech-Air® 5 Airbag System and monitor its status and battery life, as well as tracking the details of your ride. The App uses Bluetooth Connectivity to access the System’s data.  Using the MyRide feature, riders can record location and speed continuously during a ride.  Relive your ride and visualize your average and top speeds at any point along the route by zooming in on the map.  MyRide gives motorcyclists the ability to record unlimited motorcycle rides and build up a complete library of individual trips, so you can easily retrace your trips and remember the great riding moments.  How it Works • See top stats for the ride – including the exact location where these results were achieved, average speed, trip time and distance covered. • Retrace each trip on an enhanced Google Map that shows your speed at any point you select along the trip. • Build up an awesome library of each ride you take on your bike. • Disable the Tech-Air® System when you’re going to start doing heavy off-road riding. • Verify the deployment of the Tech-Air® System after an accident. • Send feedback to the Alpinestars Tech-Air® development team. • Update the System’s firmware whenever available. • Download the online manual and useful documentation for air travel, shipments, and servicing. • Register your products.

Screenshots

SHv4 Calculator4 screens
Tech4 screens

Verdict

The call

The clearest difference is review sentiment: SHv4 Calculator at 67% against Tech's 13%. SHv4 Calculator also leads on rating (5.0 vs 1.6). Tech's advantage is ratings volume (87 vs 4) and update cadence (monthly vs every 3 months). On price, ads, in-app purchases and monetization model 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.

ReceptionRating · Positive reviews · Number of ratings

SHv4 Calculator holds the better App Store score, 5.0 against 1.6. That said, the two scores are not equally well evidenced: Tech has 87 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 67% of SHv4 Calculator's written reviews are positive against 13% of Tech's.

UpkeepUpdate frequency

SHv4 Calculator ships an update every 3 months, Tech monthly. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

Scorecard4 real differences · 6 level
SHv4 Calculator versus Tech: the parameters behind the verdict, then further details
ParameterSHv4 CalculatorTech
PriceFreeFree
Rating5.0 (4 ratings) — better1.6 (87 ratings)
Positive reviews66.7% of reviews — better13.1% of reviews
Number of ratings487 — better
Update frequencyEvery 3 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size1 MB151 MB
Age rating4+4+
DeveloperHealTech Electronics Ltd.ALPINESTARS SPA

Customer experience

SHv4 Calculator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Tech

All ratings80 ratings
Positive13.8%
Neutral1.3%
Negative85.0%
Written reviews267 reviews
Positive13.1%
Neutral4.9%
Negative82.0%

Bugs and requests

SHv4 Calculator

Not enough reviews yet to summarise bugs or requests.

Tech

Reported bugs

20 issues
  • App crashes immediately upon launch after updates
  • Firmware update stuck at 2% indefinitely
  • Error 12 during firmware installation
  • Verification SMS not arriving (especially for +420 Czech numbers and other regions)
  • QR code scanner not recognizing codes
Show 15 more
  • Manual code entry not progressing past input screen
  • Bluetooth connection drops during firmware updates
  • App shows 'already paired' but vest not visible in app
  • Battery percentage displays incorrectly or as 0%
  • Software update notification loop (says update available when already updated)
  • Tap input registration incorrect on registration form
  • App unresponsive during software update process
  • Bluetooth disconnection when phone is moved away from vest
  • App crashes when accessing 'My Rides' section
  • Ride data not recording properly (shows wrong duration/metrics)
  • Location tracking showing wrong geographic location
  • iOS 26 compatibility issues
  • App not sending feedback/crash reports
  • Inconsistent behavior across different iPhone models
  • App language settings affecting firmware update capability

Requested features

13 requests
  • PC/desktop application for firmware updates
  • Lean angle tracking and display
  • Maximum speed recording in ride logs
  • Acceleration metrics in ride data
  • Altitude data in ride tracking
Show 8 more
  • Ability to change phone number associated with account
  • Email verification option as alternative to SMS
  • Improved Bluetooth antenna strength
  • Automatic ride recording without manual activation
  • Better offline functionality
  • Software update caching on vest
  • Race mode activation without app dependency
  • More detailed ride statistics and analytics

In-app purchases

None

SHv4 Calculator

No in-app purchases

None

Tech

No in-app purchases

Questions

Is SHv4 Calculator free?
SHv4 Calculator is free to download, with no in-app purchases.
Is Tech free?
Tech is free to download, with no in-app purchases.
Which has better reviews, SHv4 Calculator or Tech?
SHv4 Calculator is rated higher. SHv4 Calculator averages 5.0 out of 5 from 4 ratings, while Tech averages 1.6 from 87 ratings.
Do SHv4 Calculator or Tech have ads?
Neither SHv4 Calculator nor Tech shows ads.
Which is updated more often, SHv4 Calculator or Tech?
SHv4 Calculator ships an update every 3 months, and Tech monthly. Most recently, SHv4 Calculator was updated on October 24, 2026 and Tech on October 21, 2026.

Other comparisons