Comparison

Rayons vs RF Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Rayons

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Rayons (spokes in French) accurately calculates the proper spoke length given a set of measurements that you provide. Hub and rim manufacturers may provide the measurements or you can measure them yourself. Detailed instructions are provided in the app. The app uses simple and accurate controls to input your measurements. The spoke length for your wheel set is displayed in real-time. You can save the calculation in the app as a wheel set by typing in a text field and giving it a name. Formula The spoke length formula used by the Rayons app has a set of limitations based on the mathematics and the nature of the drawings. The formula was designed for use on conventionally laced wheels with j-bend spokes. These types of wheels are most commonly custom made by hand. The limitations outlined here may not be all inclusive. A wheel has: An even number of spokes The same number of spokes on each side of the wheel Equal spacing between spoke holes, on the rim or the hub Spokes that are crossed in pairs on each side of the wheel which dictates a spoke count divisible by four App Minimum and Maximum Dimensions The Rayons app can be used to calculate spoke lengths for a variety of component types. This covers the majority of Road, Track, Mountain Bike, Touring, Tandem, Fat Bike, Downhill, Generator and Internally Geared wheels. At this time, the app is not recommended for use with E-Bike components. Check your component dimensions and compare them with this chart. Be sure the component dimensions are supported by the app. Read the Terms of Service for more information. All of the values are in millimeters. Front Hub Flange Diameter Minimum: 28 Front Hub Flange Diameter Maximum: 150 Front Hub Offset Minimum: 15 Front Hub Offset Maximum: 48 Rear Hub Flange Diameter Minimum: 35 Rear Hub Flange Diameter Maximum: 150 Rear Hub Left Offset Minimum: 20 Rear Hub Left Offset Maximum: 60 Rear Hub Right Offset Minimum: 10 Rear Hub Right Offset Maximum: 52 Hub Spoke Hole Diameter Minimum: 1.5 Hub Spoke Hole Diameter Maximum: 3.0 Effective Rim Diameter (ERD) Minimum: 300 Effective Rim Diameter (ERD) Maximum: 700 Rim Spoke Offset Minimum: 0.0 Rim Spoke Offset Maximum: 5.0 Fat Bike Rim Spoke Offset Minimum: 0.0 Fat Bike Rim Spoke Offset Maximum: 20.0 Counts Minimum Number of Spokes: 12 Maximum Number of Spokes: 48 Minimum Number of Crosses: 0 Maximum Number of Crosses: 4

About

RF Pro

This utility app verifies the effectiveness of Faraday bags by detecting signal leaks from your device. It helps ensure your device is isolated from external communication networks for privacy, security, or forensic purposes.

Highlights
  • Comprehensive signal testing (WiFi, Cellular, GPS, Bluetooth)
  • Real-time signal strength analysis
  • Clear visual indicators and graphs
  • Step-by-step testing guidance
  • Quick retest function
Features
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RF Pro Faraday Bag Tester – Ensure Your Devices Are Secure The Faraday Bag Tester app provides a reliable way to verify the effectiveness of Faraday bags by detecting signal leaks from your device. Whether for personal privacy, security compliance, or forensic applications, this tool helps confirm that your device remains isolated from external communication networks. Key Features: • Comprehensive Signal Testing – Detects WiFi, Cellular, GPS, and Bluetooth signals to assess shielding effectiveness. • Real-Time Analysis – Continuously monitors and records signal strength before and during testing. • Clear Visual Indicators – Displays test results with signal strength graphs and status icons. • Step-by-Step Guidance – Simple instructions to ensure accurate testing procedures. • Quick Retest Function – Easily restart the test to verify results. How It Works: 1. Press “Start Test” and place the device inside the Faraday bag before the countdown ends. 2. The app will emit a series of beeps, signaling the start of the testing phase. 3. During the test, the app scans for any detectable signals. 4. A chime will indicate the test has concluded, and results will be displayed. 5. Review the signal strength readings to determine if the Faraday bag is effectively blocking transmissions. Who Should Use This App? • Privacy-conscious individuals ensuring their devices remain undetectable. • Security professionals testing Faraday enclosures for compliance. • Forensic analysts verifying signal isolation for evidence protection. • Organizations implementing secure communications and data protection policies. The Faraday Bag Tester offers a straightforward yet powerful method to validate signal shielding performance. Download today to ensure your device security.

Screenshots

Rayons4 screens
RF Pro4 screens

Verdict

The call

The clearest difference is price: RF Pro at Free against Rayons's $4.99. RF Pro also leads on iOS requirement (16.0 vs 26.0). Rayons's advantage is update cadence (every 2 months vs every 7 months). On ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

RF Pro is free to download; Rayons costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Rayons ships an update every 2 months, RF Pro every 7 months. The most recent releases landed on October 9, 2026 and October 17, 2026 respectively.

Scorecard3 real differences · 7 level
Rayons versus RF Pro: the parameters behind the verdict, then further details
ParameterRayonsRF Pro
Price$4.99Free — better
Rating—5.0 (5 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—5 — better
Update frequencyEvery 2 months — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.016.0 — better
Further details — not scored
Size3 MB7 MB
Age rating4+4+
DeveloperTimothy P MillerOffGrid

In-app purchases

None

Rayons

No in-app purchases

None

RF Pro

No in-app purchases

Questions

Is Rayons free?
Rayons costs $4.99, with no in-app purchases.
Is RF Pro free?
RF Pro is free to download, with no in-app purchases.
Do Rayons or RF Pro have ads?
Neither Rayons nor RF Pro shows ads.
Which is updated more often, Rayons or RF Pro?
Rayons ships an update every 2 months, and RF Pro every 7 months. Most recently, Rayons was updated on October 9, 2026 and RF Pro on October 17, 2026.

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