RSiAJP vs Speedtail
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RSiAJP
Monitor and diagnose your TVR AJP engined car's ECU in real-time. View live engine data, logged faults, and GPS information. Reset faults, service intervals, and adaptives. Set custom alerts with voice and sound notifications.
- Real-time ECU data display
- Live and logged fault monitoring
- GPS speed, coordinates, and heading
- ECU fault and service interval reset
- Customizable alert thresholds with audio
- Data logging for export
- Simulated mode for demonstration
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This application enables the display and background monitoring of ECU information for TVR AJP (V8 and S6) engined cars (Cerbera, Tamora, Tuscan, Sagaris, T350). The application connects to the car's MBE 941/970 ECU using a Bluetooth Low Energy serial adapter available from http://http://rsiajp.com The app displays real time data such as water temperature, throttle position, air temperature, ignition advance, rpm, etc... as well as live and logged faults as reported by the ECU. Also, though the use of the onboard GPS, your current travelling speed is available for display. In addition to displaying the data, the application enables the user to reset the ECU's logged faults, service interval, adaptives and throttle (S6) and can be used to log live data for export via email. Warning thresholds can be setup on individual data items, the thresholds will be displayed through colour coding on the gauges. A fully simulated mode is available to show the application to your friends too, even though you're not connected to a car. More details on our website: http://rsiajp.com and our Facebook page https://www.facebook.com/rsiajp The author of the application will accept no liability whatsoever for any damage to the car, engine or ECU resulting from the use of the application. By running the application you accept full responsibility of any potential consequences.
Speedtail
Monitor your McLaren Speedtail's charging status remotely via your wallbox charger. This app offers insights into the performance and efficiency of one of McLaren's most advanced vehicles.
- Remote charging status view
- Wallbox charger connectivity
- McLaren Speedtail information
- Automotive design benchmark
- Hybrid powertrain details
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Our most aerodynamically efficient car ever. And the fastest McLaren to date. With a pioneering 1070PS hybrid powertrain at its core. It brings together unprecedented levels of innovation and elegance to create a new benchmark in automotive design. Download the McLaren Speedtail app and connect to your wallbox charger to remotely view the charging status of your Speedtail.
Screenshots
Verdict
The clearest difference is price: Speedtail at Free against RSiAJP's $22.99. Speedtail also leads on update cadence (daily vs every 2 months) and iOS requirement (9.0 vs 14.0). RSiAJP's advantage is device support (4 vs 2). On rating, ratings volume, ads and in-app purchases 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
Speedtail is free to download; RSiAJP costs $22.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for RSiAJP against 5.0 for Speedtail. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
RSiAJP ships an update every 2 months, Speedtail daily. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.
| Parameter | RSiAJP | Speedtail |
|---|---|---|
| Price | $22.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPod |
| Requires iOS | 14.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 33 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Grenat | McLaren Automotive Limited |
Customer experience
RSiAJP
Speedtail
In-app purchases
RSiAJP
No in-app purchases
Speedtail
No in-app purchases









