# ActiveOBD vs TrafoCalc

The clearest difference is price: ActiveOBD at Free against TrafoCalc's $0.99. ActiveOBD also leads on iOS requirement (13.0 vs 18.2). TrafoCalc's advantage is in-app purchases (none vs 1) and update cadence (every 9 days vs every 3 months). On ads and device support there is nothing between them.

ActiveOBD is free to download; TrafoCalc costs $0.99 up front. ActiveOBD sells 1 in-app purchase, starting at $4.99 per month. TrafoCalc asks for nothing beyond the download.

ActiveOBD ships an update every 3 months, TrafoCalc every 9 days. The most recent releases landed on July 23, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | ActiveOBD | TrafoCalc |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.6 (39 ratings)](https://appshunter.io/ios/app/activeobd/id1524791245/reviews)** | — |
| Number of ratings | **39** | — |
| Positive reviews | 45.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Freemium | — |
| Size | 24 MB | 4 MB |
| Requires iOS | **13.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mykhailo Zolotarov](https://appshunter.io/developer/1524791247) | [Mohd Dahnial Ismail](https://appshunter.io/developer/1868973164) |

## What reviewers say

### ActiveOBD

[App page](https://appshunter.io/ios/app/activeobd/id1524791245)

This app functions as an OBDII scanner, offering specialized support for Subaru vehicles (MY2012+). It provides basic parameter readings for free, with a subscription unlocking advanced features like trouble code reading and data logging.

**Highlights:** OBDII scanning, Subaru-specific support (MY2012+), CVT Oil Temperature reading, AWD duty (%) parameter reading, Trouble code reading (full version), Data logging (full version), Graphs building (full version)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version Subscription | $4.99 | per month |


### TrafoCalc

[App page](https://appshunter.io/ios/app/trafocalc/id6757797482)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ActiveOBD free?

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

### Is TrafoCalc free?

TrafoCalc costs $0.99, with no in-app purchases.

### Do ActiveOBD or TrafoCalc have ads?

Neither ActiveOBD nor TrafoCalc shows ads.

### Which is updated more often, ActiveOBD or TrafoCalc?

ActiveOBD ships an update every 3 months, and TrafoCalc every 9 days. Most recently, ActiveOBD was updated on July 23, 2026 and TrafoCalc on September 8, 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.*