# Call Forwarding vs NOX TESTER

The clearest difference is price: NOX TESTER at Free against Call Forwarding's $2.99. NOX TESTER also leads on rating (5.0 vs 1.5) and update cadence (every 3 weeks vs every 2 months). Call Forwarding's advantage is ratings volume (16 vs 1) and iOS requirement (10.0 vs 15.6). On ads, in-app purchases, monetization model and device support there is nothing between them.

NOX TESTER is free to download; Call Forwarding costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

NOX TESTER holds the better App Store score, 5.0 against 1.5. That said, the two scores are not equally well evidenced: Call Forwarding has 16 ratings behind it against 1, so its average is the more settled of the two.

Call Forwarding ships an update every 2 months, NOX TESTER every 3 weeks. The most recent releases landed on October 26, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Call Forwarding | NOX TESTER |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [1.5 (16 ratings)](https://appshunter.io/ios/app/call-forwarding/id421352949/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nox-tester/id6758373750/reviews)** |
| Number of ratings | **16** | 1 |
| Positive reviews | 8.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 14 MB | 5 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Abdel Karim Souman](https://appshunter.io/developer/418658737) | [Proformance Diagnostics LLC](https://appshunter.io/developer/1852904316) |

## What reviewers say

### Call Forwarding

[App page](https://appshunter.io/ios/app/call-forwarding/id421352949)

Enable conditional call forwarding on your iPhone for busy, unanswered, or out-of-reach calls. Manage activation, deactivation, and status checks for these forwarding types. This app utilizes standard GSM call forwarding codes.

**Highlights:** Conditional call forwarding, Forward when busy, Forward when no answer, Forward when out of reach, Activate call forwarding, Deactivate call forwarding, Check call forwarding status

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### NOX TESTER

[App page](https://appshunter.io/ios/app/nox-tester/id6758373750)

This diagnostic tool tests NOx sensors by connecting to the sensor's circuit board and probe. It activates the sensor, collects data on NOx and oxygen levels for three minutes, and analyzes the results to identify faults and generate a report.

**Highlights:** Connects to NOx sensor via diagnostic harness, Communicates via CAN signals, Tests sensor circuit board and detection probe, Activates NOx sensor, Collects NOx and oxygen concentration data, Analyzes data and generates test reports

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Call Forwarding free?

Call Forwarding costs $2.99, with no in-app purchases.

### Is NOX TESTER free?

NOX TESTER is free to download, with no in-app purchases.

### Which has better reviews, Call Forwarding or NOX TESTER?

NOX TESTER is rated higher. Call Forwarding averages 1.5 out of 5 from 16 ratings, while NOX TESTER averages 5.0 from 1 ratings.

### Do Call Forwarding or NOX TESTER have ads?

Neither Call Forwarding nor NOX TESTER shows ads.

### Which is updated more often, Call Forwarding or NOX TESTER?

Call Forwarding ships an update every 2 months, and NOX TESTER every 3 weeks. Most recently, Call Forwarding was updated on October 26, 2026 and NOX TESTER on October 19, 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.*