Wheels Speed Calculator vs OBD JScan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Wheels Speed Calculator
Calculate the error in your speedometer when using tires of different dimensions than recommended by the manufacturer. It helps you find tire sizes that minimize speedometer inaccuracies for your vehicle.
- Calculate speedometer error
- Check speed differences with different tire sizes
- Select tire sizes from R4/80/25 to R26/460/100
- Find tire sizes for minimum speedometer error
- Suggests 100 tire sizes for smallest error
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wheels speed calculator will allow you to check speedometer error and speed differences if you use different dimensions tires on your vehicle than manufacturer recommends. Tires size could be selected from R4/80/25 to R26/460/100. You may also check what sizes tires would make minimum error for speedometer if you decide to use not manufacturer recommend wheel diameter. App will tell you one hundred tires sizes that would make smallest error to speedometer. NOTE: this app only calculates speedometer error. It does NOT suggests that you should use wheels or tires that are not recommended by manufacturer of vehicle.
OBD JScan
This diagnostic application provides in-depth access to vehicle modules, allowing users to read and clear trouble codes, view live sensor data, and access vehicle settings. It supports a wide range of Jeep, Chrysler, and Dodge models, offering powerful customization and diagnostic features.
- Read and clear diagnostic trouble codes
- Access live data from all vehicle sensors
- View vehicle settings and module information
- Supports ABS, transmission, and other modules
- Wide compatibility with Jeep, Chrysler, Dodge
- Enables features locked by dealers
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What is OBD JScan? OBD JScan is powerful Jeep & Chrysler & Dodge diagnostic application. JScan allows reading standard Diagnostic Trouble Codes (emission related), general Live Data and Adaptations and much more. Thats not all. JScan can access all modules avalable on your vehicle. ABS, Steering Column, Automatic Transimmsion, Radio, Sway Bar, Havac and many more. Some supported cars: Jeep Wrangler JK, Jeep Wrangler JL - additional hardware required to bypass security gateway* Jeep Wrangler JT - additional hardware required to bypass security gateway* Jeep Wrangler 4XE - additional hardware required to bypass security gateway* Jeep Grand Cherokee WK Jeep Grand Cherokee, WK2 11-13 Jeep Grand Cherokee WK2 14-21 - 18+ - additional hardware required to bypass security gateway* Jeep Commander XK Jeep Liberty/Cherokee KK, Jeep Compass, Jeep Patriot MK Dodge Avenger Dodge Grand Caravan RT, Dodge Journey, Dodge Caliber Dodge Durango 2004-2009 Dodge Durango 2011-2013 Dodge Durango 2014-2025* Dodge Ram Dodge Ram Promaster Dodge Nitro Dodge Magnum Dodge Challenger - 08-14 Dodge Challenger - 14+ Dodge Charger- 06-10 Dodge Charger- 11+ Dodge Avenger Chrysler Town&Country RT Chrysler 200 Chrysler 300C Chrysler 300 Chrysler Sebring Chrysler Aspen and more.. * WK2 2018+ = requires securit bypass cable * Dodge Durango 2018+ = requires securit bypass cable * Dodge Ram 2018+ = requires securit bypass cable * JL requires security bypass cable * JT requires security bypass cable * http://jscan.net/jl-jt-security-bypass/ What can I Do with JScan? JScan allows you to access, diagnostic trouble codes and Live Data in all modules. You can easily Read, Clear, Share vehicle Trouble Codes. View Live Data from all sensors in vehicle. View vehicle settings. Identify module, Vin, Part Number, Version and more. Recommended device: - OBD ELM 327 compatible device is required to make app work as expected. Recommended adapters: - iCar Pro 4.0 Bluetooth LE (Bluetooth) - Vlinker MC+ (Bluetooth) - for newer cars - OBD Link MX+ Bluetooth (Bluetooth) More info about supported and recommended OBD adapters: http://jscan.net/supported-and-not-supported-obd-adapters/ Facebook: https://www.facebook.com/obdjscan/ Website: http://jscan.net/
Screenshots
Verdict
The clearest difference is review sentiment: OBD JScan at 80% against Wheels Speed Calculator's 0%. OBD JScan also leads on rating (4.7 vs 1.0) and ads (none vs shown). Wheels Speed Calculator's advantage is in-app purchases (none vs 7). On price, 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. OBD JScan sells 6 one-off in-app purchases. Wheels Speed Calculator asks for nothing beyond the download.
OBD JScan holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: OBD JScan has 1.3K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Wheels Speed Calculator's written reviews are positive against 80% of OBD JScan's.
Wheels Speed Calculator ships an update every 6 months, OBD JScan every 3 weeks. The most recent releases landed on October 8, 2026 and October 29, 2026 respectively.
| Parameter | Wheels Speed Calculator | OBD JScan |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 4.7 (1.3K ratings) — better |
| Positive reviews | 0.0% of reviews | 79.6% of reviews — better |
| Number of ratings | 1 | 1.3K — better |
| Update frequency | Every 6 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 44 MB | 403 MB |
| Age rating | 4+ | 12+ |
| Developer | Liutauras Stravinskas | Piotr Bialic |
Customer experience
Wheels Speed Calculator
OBD JScan
Bugs and requests
Wheels Speed Calculator
Not enough reviews yet to summarise bugs or requests.
OBD JScan
Reported bugs
2 issues- Inability to save/export diagnostic data
- Inconsistent behavior when changing vehicle settings
Requested features
4 requests- Expanded vehicle compatibility
- Improved stability and reliability
- Enhanced user interface and guidance
- Integration with other vehicle apps/services
In-app purchases
Wheels Speed Calculator
No in-app purchases
OBD JScan
- + 1 garage license2 variants$9.99
- 1 VIN license$20.99
- Add 1 VIN Vehicle Slot$20.99
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- 3 VIN licenses$54.99
- 5 VIN Licenses$84.99
- 10 VIN Licenses$149.99
Questions
Is Wheels Speed Calculator free?
Is OBD JScan free?
Which has better reviews, Wheels Speed Calculator or OBD JScan?
Do Wheels Speed Calculator or OBD JScan have ads?
Which is updated more often, Wheels Speed Calculator or OBD JScan?
Other comparisons
