# RSiAJP vs Polar

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.

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.

## The numbers

| Metric | RSiAJP | Polar |
| --- | --- | --- |
| Price | $22.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rsiajp/id1234725485/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Paid | — |
| Size | 33 MB | 69 MB |
| Requires iOS | **14.0** | 17.4 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Grenat](https://appshunter.io/developer/1234725484) | [GivEnergy Software Limited](https://appshunter.io/developer/1711761312) |

## What reviewers say

### RSiAJP

[App page](https://appshunter.io/ios/app/rsiajp/id1234725485)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


### Polar

[App page](https://appshunter.io/ios/app/polar-ess/id6478309215)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly Subscription | $25.00 | per year |


## Frequently asked questions

### Is RSiAJP free?

RSiAJP costs $22.99, with no in-app purchases.

### Is Polar free?

Polar is free to download, with in-app purchases available.

### Do RSiAJP or Polar have ads?

Neither RSiAJP nor Polar shows ads.

### Which is updated more often, RSiAJP or Polar?

RSiAJP ships an update every 2 months, and Polar every 5 weeks. Most recently, RSiAJP was updated on November 11, 2026 and Polar on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*