SHv4 Calculator vs Motool Service Assistant
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Calculate speedometer error
- Generate SpeedoHealer v4 setup instructions
- Access troubleshooting information
- Ad-free experience
- Offline functionality
- Compatible with most motorcycles and cars
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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.
Motool Service Assistant
This app helps motorcycle and mountain bike owners track maintenance tasks, log suspension settings, and record ride notes. It offers reminders for upcoming services and supports managing multiple bikes. An optional subscription unlocks advanced features and a virtual remote display.
- Service task tracking
- Suspension setting logs
- Ride notes documentation
- Service interval reminders
- Unlimited bike management
- Virtual remote display
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Your whole garage in your pocket. Save every bike, log every setting, and watch service intervals tick down as the hours and miles add up, so nothing sneaks up on you. Service Assistant is the setup and maintenance logbook for people who work on their own bikes- dirt, street, ADV, or MTB. Add a motorcycle or mountain bike, save its baseline settings, then build a record you can trust instead of trying to remember what you changed three rides ago. A SERVICE CENTER THAT COUNTS DOWN FOR YOU Set the intervals that matter to you the most- suspension service every 40 hours, tune-up every 15 hours, chain every 300 miles. After a ride, log your hours or mileage once. Service Assistant subtracts from every interval automatically and tells you what's coming due before it becomes a problem. You can track by mileage or runtime depending on the bike type. Engine, suspension, chassis, brakes, electrical, drivetrain: if it runs on a schedule, you can track it here. SETTINGS YOU CAN ACTUALLY FIND AGAIN Save a baseline for every bike, then log what you change as you dial it in. Clicker positions, sag, spring rates, tire pressure, gearing, bar and lever position. Record it, compare it, and get back to it when a setup change doesn't pan out. KEY FEATURES • Unlimited bikes — a full profile for every machine you own or maintain • Baseline settings — the known-good starting point you can always return to • Setup notes — suspension, tire pressure, ergonomics, conditions, results • Custom service intervals — by engine hours or mileage, set however you want • Automatic countdown — add hours or miles once, every interval updates • Complete service history — what you did, when you did it, on which bike • Slacker Virtual Remote — turns your phone into a large, easy-to-read display for the Slacker digital sag scale BUILT FOR RIDERS AND THE SHOPS THAT KEEP THEM RUNNING Whether it's one bike in the garage or a rack of customer machines, everything lives in one place — searchable, organized, and there the next time you need it. FROM THE MAKERS OF SLACKER Service Assistant is built by Motool, the team behind the Slacker digital sag scale — the patented suspension setup tool trusted by riders, tuners, and shops since 2014. Start with a 30-day free trial. $0.99/month or $9.99/year after that. — Payment will be charged to your Apple Account at the end of the 30-day free trial. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel your subscription anytime in your Apple Account settings. Any unused portion of a free trial is forfeited when you purchase a subscription. Terms of Service: https://getslacker.com/pages/terms-and-conditions Privacy Policy: https://getslacker.com/pages/privacy-policy
Screenshots
Verdict
The clearest difference is rating: SHv4 Calculator at 5.0 against Motool Service Assistant's 3.3. SHv4 Calculator also leads on review sentiment (67% vs 32%) and in-app purchases (none vs 2). Motool Service Assistant's advantage is update cadence (every 8 days vs every 3 months) and ratings volume (24 vs 4). On price, ads, device support and iOS requirement 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
Both are free to download. Motool Service Assistant sells 2 in-app purchases, starting at $0.99 per month. SHv4 Calculator asks for nothing beyond the download.
SHv4 Calculator holds the better App Store score, 5.0 against 3.3. That said, the two scores are not equally well evidenced: Motool Service Assistant has 24 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 32% of Motool Service Assistant's.
SHv4 Calculator ships an update every 3 months, Motool Service Assistant every 8 days. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | SHv4 Calculator | Motool Service Assistant |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | 3.3 (24 ratings) |
| Positive reviews | 66.7% of reviews — better | 31.6% of reviews |
| Number of ratings | 4 | 24 — better |
| Update frequency | Every 3 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 1 MB | 233 MB |
| Age rating | 4+ | 4+ |
| Developer | HealTech Electronics Ltd. | Motool Inc |
Customer experience
SHv4 Calculator
Motool Service Assistant
In-app purchases
SHv4 Calculator
No in-app purchases
Motool Service Assistant
- Service Assistant1 Month trial$0.991 Month
- Service Assistant1 Month trial$9.991 Year
Questions
Is SHv4 Calculator free?
Is Motool Service Assistant free?
Which has better reviews, SHv4 Calculator or Motool Service Assistant?
Do SHv4 Calculator or Motool Service Assistant have ads?
Which is updated more often, SHv4 Calculator or Motool Service Assistant?
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