Call Forwarding vs NOX TESTER
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Call Forwarding
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.
- 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
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Now you can have conditional call forwarding on your iPhone you can forward calls when busy, when no answer, and/or when out of reach. with call forwarding you can activate, deactivate and check status of all of the above conditional call forwarding types. **This app is using default call forwarding codes which are used by GSM carriers all over the world if your carrier is not a GSM carrier this app will not work with you**
NOX TESTER
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.
- 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
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The NOx SENSOR TESTER is a specialized testing device for NOx sensors. It connects to the sensor via a dedicated diagnostic harness. The self-developed APP+ diagnostic device communicates with the NOx sensor via CAN signals, testing the sensor circuit board and detection probe. Upon successful communication, a working command can be sent to activate the NOx sensor. The probe will then start heating up and, once it reaches its operating temperature, will continuously collect NOx values and oxygen concentration. The testing process takes 3 minutes, during which the device analyzes the collected data to determine the sensor's condition, identifies the cause of any faults, and generates a test report.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Call Forwarding | NOX TESTER |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.5 (16 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 8.2% of reviews | — |
| Number of ratings | 16 — better | 1 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 10.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 14 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Abdel Karim Souman | Proformance Diagnostics LLC |
Customer experience
Call Forwarding
NOX TESTER
In-app purchases
Call Forwarding
No in-app purchases
NOX TESTER
No in-app purchases
Questions
Is Call Forwarding free?
Is NOX TESTER free?
Which has better reviews, Call Forwarding or NOX TESTER?
Do Call Forwarding or NOX TESTER have ads?
Which is updated more often, Call Forwarding or NOX TESTER?
Other comparisons
