RSiAJP vs Polar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RSiAJP
Monitor and display real-time ECU data for TVR AJP engined cars. View live diagnostics, log faults, and reset service intervals. Includes a simulated mode for demonstration.
- Real-time ECU data display
- Live and logged fault monitoring
- Reset ECU faults and service intervals
- GPS speed display
- Configurable warning thresholds
- Simulated mode for demonstration
- Live data logging and export
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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.
Polar
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The Polar-ESS App uses an API and connects to your Polar-ESS Cloud Monitoring account. The APP provides basic information about your Home Energy Demand, Solar PV Generation, Grid import energy and Battery Usage To view the Privacy Policy and EULA please visit the links provided in the app, or visit https://givenergy.co.uk/website-privacy-policy/ and https://polar-ess.co.uk/terms/ respectively.
Screenshots
Verdict
The clearest difference is price: Polar at Free against RSiAJP's $22.99. RSiAJP's advantage is in-app purchases (none vs 1) and device support (4 vs 2). On update cadence and ads 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
Polar is free to download; RSiAJP costs $22.99 up front. Polar sells 1 in-app purchase, starting at $25.00 per year. RSiAJP asks for nothing beyond the download.
RSiAJP ships an update every 2 months, Polar every 5 weeks. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.
| Parameter | RSiAJP | Polar |
|---|---|---|
| Price | $22.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.4 |
| Further details — not scored | ||
| Size | 33 MB | 69 MB |
| Age rating | 4+ | 4+ |
| Developer | Grenat | GivEnergy Software Limited |
In-app purchases
RSiAJP
No in-app purchases
Polar
- Yearly Subscription1 Year trial$25.001 Year









