PowerVision 4 vs V
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PowerVision 4
Control your motorcycle's engine performance directly from your iPhone. Access hundreds of pre-loaded engine tunes or create custom ones. Easily flash tunes to your bike's ECU, monitor real-time engine data, and manage diagnostic trouble codes.
- Flash tunes to ECU
- Access vast tune database
- Record real-time engine data
- Read/clear diagnostic codes
- Remote tuning optimization
- Autotune modes
- Active tests for diagnostics
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Power Vision 4 from Dynojet Research Inc. combined with your iPhone puts you in control of your bike’s engine. Gain access to hundreds of different tunes for various aftermarket components and easily flash any of them to you bike’s ECU. Unbelievably quick and easy to use; make more power and torque with the push of a button. Advanced users can edit hundreds of individual engine parameters to build a tune that’s dialed in for their unique setup using Dynojet’s integrated cloud tune delivery system. With the PV4 App and our pocket-sized PV4 device you can: • Flash tunes to your ECU – no setup required, just create an account, select your tune, flash, and ride the ultimate ride. • Access to vast database of pre-loaded tunes for different configurations – no custom tuning required. • Easily download and manage pre-loaded and custom tunes. • Record real-time engine data and review in WinPEP 8 Data Center. • Read, review, clear, and share diagnostic trouble codes (DTC’s) with built-in descriptions. • Flash an unlimited number of bikes with one device.* • Use licenses from your Power Vision Classic with your Power Vision 4. • Return to stock at any time – your original, factory tune is safely backed up on the cloud and on your phone. • Optimized for remote-tuning. – Easily ride, record, and share data logs with your tuner for trouble-free custom tuning without a dynamometer. • Keep your ECU – The Power Vision 4 reprograms your bike without having to remove or mail-in the ECU. Just plug into the diagnostic connector and flash, it’s really that easy. • Autotune - Choose from three different Autotune modes to dial your HD motorcycle in the way that fits you best. • Dynamometer Compatible - Plug your PV4 directly into your Dynojet Dynamometer to view channels, flash, read diagnostic information, read RPM via OBD, and load control without an inductive pickup. • Flashes on HD motorcycles as fast as 12.75 seconds (select models) • Active Tests help diagnose problems on your HD - cycle the fuel pump, indicators, water pump, and many other components when troubleshooting engine or electrical issues. • Diagnostic Routines allow you to bleed the ABS system at home World class, US-based customer service from our team of motorcycle enthusiasts is also available to suggest the best tune, review data recordings, or assist in troubleshooting. Your ultimate ride awaits with Power Vision 4 – download the app and see how easy tuning can be! * First bike license included with purchase of Power Vision 4 device. Requires purchase of license for each additional bike DISCLAIMER: Not legal for sale or use in California
V
Troubleshoot your Harley EFI motorcycle with symptom-based diagnostics and service reminders. Access DTC codes, torque specs, and bike-specific information without hardware. Offers a premium subscription for guided troubleshooting and detailed diagrams.
- Symptom-based diagnostic Q&A
- DTC trouble code lookup
- Torque specs and service intervals
- Smart Service Scheduler
- Circuit diagrams
- Component identification cards
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Your bike's down. The dealer's booked two weeks out. And they charge hundreds just to tell you what's wrong. Every Harley rider knows this math: $100 to $300 for the tow, days or weeks on the lift waitlist, then a diagnostic fee just to be told what your bike was already trying to say. V-Twin Diagnostics ends that. Answer questions about what your bike is doing, what you see, hear, and feel. The app walks the same systematic process a trained tech uses and lands on the probable cause in minutes. No code reader. No hardware. No waiting. ONE DIAGNOSTIC PASS. EVERYTHING BELOW IS IN IT: • Guided Diagnostic Path: proprietary step-by-step troubleshooting built for your exact year and model • Comprehensive Diagnostic Report: complete specs, related trouble codes, the full path you followed, and findings, saved to your bike's profile • Circuit Diagrams and Component Cards: see the actual system behind each probable cause • A Parking Spot in Your Garage: your bike's profile with full specs, notes, and history • Diagnostic History: every run saved, ready to review or export as a PDF PAY ONLY WHEN YOUR BIKE NEEDS IT. NO SUBSCRIPTION REQUIRED. • Diagnostic Pass, $9.99: one complete diagnostic. Never expires. • 3-Pack, $24.99: bank them for when it counts. • Annual License, $59.99/yr: unlimited diagnostics for every bike in your garage, less than half of one dealer diagnostic fee, plus the annual-only Mechanic's Checklists. FREE FOR EVERY RIDER, NO ACCOUNT NEEDED: • DTC code lookup: 71 trouble codes in plain English with probable causes • Torque specs: 119 specs for Twin Cam and Evolution Sportster • Recommended service intervals by mileage FREE WITH AN ACCOUNT: a parking spot for your bike and the Oil Change Service Scheduler, free oil-change reminders matched to your bike and mileage. Covers 2007–2017 Harley-Davidson motorcycles with Delphi EFI: Touring, Softail, Dyna, and Evolution Sportster, including CVO variants. It's YOUR bike. It's been talking to you this whole time. Now you speak the language. V-Twin Diagnostics is an independent aftermarket reference tool, not affiliated with or endorsed by Harley-Davidson. Terms of Use (EULA): https://vtwindiagnostics.com/terms Privacy Policy: https://vtwindiagnostics.com/privacy-policy
Screenshots
Verdict
The clearest difference is review sentiment: PowerVision 4 at 78% against V's 0%. PowerVision 4 also leads on rating (4.9 vs 4.0) and ratings volume (312 vs 2). V's advantage is update cadence (weekly vs monthly). 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
Both are free to download. PowerVision 4 sells 8 one-off in-app purchases and V sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
PowerVision 4 holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: PowerVision 4 has 312 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 78% of PowerVision 4's written reviews are positive against 0% of V's.
PowerVision 4 ships an update monthly, V weekly. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.
| Parameter | PowerVision 4 | V |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (312 ratings) — better | 4.0 (2 ratings) |
| Positive reviews | 77.9% of reviews — better | 0.0% of reviews |
| Number of ratings | 312 — better | 2 |
| Update frequency | Monthly | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 104 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | Dynojet | Matthew Griffin |
Customer experience
PowerVision 4
V
Bugs and requests
PowerVision 4
Reported bugs
4 issues- App crashes when using diagnostic functions
- Bluetooth disconnects during tuning process
- Sensor readings not updating correctly
- Tune flashing fails intermittently
Requested features
5 requests- Add more pre-loaded tune options
- Implement an auto-tune feature
- Improve data logging and cloud integration
- Expand support for wider range of bikes
- Enhance live sensor data display
V
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PowerVision 4
- Universal Token$10.00
- Universal Token (3x)$30.00
- Universal Token (5x)$50.00
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- Universal Token (10x)$100.00
- Universal Token (15x)$150.00
- Universal Token (20x)$200.00
- Universal Token (25x)$250.00
- Universal Token (30x)$300.00
V
- V-Twin Premium3 Days trial$9.991 Month







