LensFactor vs RF Control
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LensFactor
This app helps calculate lens factors, screen sizes, and projector distances based on known variables. It's a utility for professionals or enthusiasts needing precise measurements for display setups.
- Calculate lens factor
- Calculate screen size
- Calculate projector distance
- Input screen size and projector distance
- Input lens factor and projector distance
- Input lens factor and screen size
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LensFactor is an application for the iPhone OS which has 3 basic functions: - Calculate the lens factor when the screen size and projector distance is known - Calculate the screen size when the lens factor(s) and projector distance is known - Calculate the projector distance when the lens factor(s) and screen size is known
RF Control
Remotely manage and monitor up to 48 channels of wireless receivers from Sennheiser and Shure. Provides a quick overview of vital parameters and detailed control for live situations. Features real-time RF and AF level plotting for walk tests and dropout detection.
- Control up to 48 wireless receiver channels
- Monitor RF and AF levels
- View battery status and remaining time
- Adjust frequency, bank, and channel
- Real-time RF/AF level plotting
- RF environment scanning (Sennheiser only)
- Export scan data as CSV
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RF Control remotely controls up to 48 channels of Sennheiser* and Shure* wireless receivers in one application, side-by-side. The intuitive user interface provides a quick overview of the most vital parameters of your wireless receivers. Dedicated screens have been carefully developed to give you control to parameters that are relevant in a live situation while securing access to the ones that might be harmful to the safety of the system. Following devices are supported by utilizing the manufacturers remote control protocols: Sennheiser: EW-DX, EM 3732*, 2000* series and evolution G3 and G4* wireless receivers. Sennheiser: EM 6000 receivers Shure: ULX-D* Depending on the manufacturer of the receiver RF Control supports monitoring of the most relevant parameters including: - RF level bargraph (all) - AF Level bargraph (all) - Battery status information (all) - Remaining battery time (Shure, EM6000, EW-DX (with Li-Ion battery)) - Device name (all) - EQ type (2000 and ewG3) - Command settings (EM3732COM) - AF Out level (all) - Squelch level (Sennheiser) - Mic Offset (Shure, EM6000, EW-DX) - Lock Status (Shure, EM6000, EWDX) - Encryption Status (Shure, EM6000, EW-DX) - TX Type (Shure, EM 6000, EW-DX) - TX RF Power (Shure) - LQI (EM6000, EW-DX) - Capsule type (EM6000, EW-DX) - Warning indicators (Sennheiser: Low Bat, RX Mute, TX Mute, RF Mute, AF Peak, NoLink, Encryption mismatch) (Shure: Low Bat, Interference, RX Mute, TX Mute, Enrcryption mismatch, AF Peak) A plot of the RF and AF levels is displayed over time, making it the perfect companion for walk tests and spotting dropouts in your audio. The full screen plot window of the iPad version allows to scroll through the recorded RF and audio levels to look up for problems and drop-outs even after hours of recording. All relevant parameters can be remotely controlled: - Frequency, bank, channel (all) - Device name (all) - EQ type (2000 and ewG3) - Command type (EM3732COM) - AF Out level (all) - Squelch level (Sennheiser) - RX Mute (Shure) iPad only: The scan window allows you to use one of the recognized Sennheiser devices to scan the RF environment. The frequency plot can be used to drill down the spectrum and look for free frequencies. The RF Inspector allows for sample accurate readout of the scan data at your fingertips. The scan data can be stored as *.csv file and sent as attachment via email. The *.csv file I can be loaded from third party software for frequency coordination and planning. Scan is not supported by Shure devices. During start up RF Control will scan your network for connected devices. For Sennheiser 2000 series and evolution wireless G3 devices Firmware 1.7.0 or higher needs to be present on the receivers to support the remote control protocol. The app can monitor up to 48 channels in mixed configurations. The device list allows access to all devices in the network and selection of 48 devices for monitoring. The order of channels can be freely arranged and will be restored at the next start of the app. Notes: RF Control is the new name of the wilSmoTe app. RF Control does not support IEM transmitters! Channel count depends on hardware performance! Sennheiser, EW-DX, EM 6000, EM 3732, 2000 series, evolution G3 / G4 are brands, products or trademarks of Sennheiser electronic GmbH & Co.KG and not associated in any way with RF Control. Shure, ULXD, QLXD, Axient are brands, products or trademarks of Shure Inc. and not associated in any way with RF Control.
Screenshots
Verdict
The clearest difference is review sentiment: LensFactor at 89% against RF Control's 33%. LensFactor also leads on rating (5.0 vs 1.7) and price ($1.99 vs $5.99). RF Control's advantage is update cadence (every 3 months vs every 24 months) and ratings volume (6 vs 2). 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
LensFactor costs $1.99 and RF Control $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
LensFactor holds the better App Store score, 5.0 against 1.7. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 89% of LensFactor's written reviews are positive against 33% of RF Control's.
LensFactor ships an update every 24 months, RF Control every 3 months. The most recent releases landed on September 21, 2026 and September 16, 2026 respectively.
| Parameter | LensFactor | RF Control |
|---|---|---|
| Price | $1.99 — better | $5.99 |
| Rating | 5.0 (2 ratings) — better | 1.7 (6 ratings) |
| Positive reviews | 88.9% of reviews — better | 33.3% of reviews |
| Number of ratings | 2 | 6 — better |
| Update frequency | Every 24 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 1 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Bart van Stiphout | Claus Menke |
Customer experience
LensFactor
RF Control
In-app purchases
LensFactor
No in-app purchases
RF Control
No in-app purchases









