Comparison

Rayons vs Metal Detector S

Price, ratings, monetisation and update history for both apps, side by side β€” 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

Metal Detector S

Features
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features include: Real-Time Magnetic Field Detection: Displays magnetic field strength (in Β΅T) with an intuitive level indicator. Vibration Alerts: Triggers vibration when magnetic field strength exceeds the threshold (device support required). Clean Interface: Modern design with start/stop detection and vibration control buttons for intuitive operation. Features Efficient Detection: Processes magnetometer data in real-time without storing or transmitting it, ensuring privacy. Customizable Experience: Toggle vibration on/off to suit different scenarios. Notes Detection Limitation: Only detects magnetic metals (e.g., iron, nickel); non-magnetic metals (e.g., aluminum, copper) are not detectable. Device Compatibility: Some devices may not support magnetometer or vibration functions. Please check your device’s compatibility. Download Metal Detector S now and experience convenient metal detection!

Screenshots

Rayons4 screens
Metal Detector S4 screens

Verdict

The call

The clearest difference is price: Metal Detector S at Free against Rayons's $4.99. Metal Detector S also leads on update cadence (weekly vs every 2 months) and iOS requirement (13.0 vs 26.0). Rayons's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Metal Detector S 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, Metal Detector S weekly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard4 real differences Β· 2 level
Rayons versus Metal Detector S: the parameters behind the verdict, then further details
ParameterRayonsMetal Detector S
Price$4.99Free β€” better
Update frequencyEvery 2 monthsWeekly β€” better
AdsNo β€” betterYes
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.013.0 β€” better
Further details β€” not scored
Size3 MB27 MB
Age rating4+4+
DeveloperTimothy P MillerYangming Mai

In-app purchases

None

Rayons

No in-app purchases

None

Metal Detector S

No in-app purchases

Questions

Is Rayons free?
Rayons costs $4.99, with no in-app purchases.
Is Metal Detector S free?
Metal Detector S is free to download, with no in-app purchases.
Do Rayons or Metal Detector S have ads?
Metal Detector S shows ads; Rayons does not.
Which is updated more often, Rayons or Metal Detector S?
Rayons ships an update every 2 months, and Metal Detector S weekly. Most recently, Rayons was updated on November 3, 2026 and Metal Detector S on October 30, 2026.

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