Diffraction Grating Calculator vs Metal Detector Pro+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Diffraction Grating Calculator
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Diffraction Grating Calculator is a physics/math calculator that calculates the angles of diffracted orders of monochromatic light when shone on a reflective diffraction grating. Features: - Instant calculation. - Results are copyable to other apps. - Formulas are included as reference. - Supports up to 16 decimal places. - Supports various units for each input. - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. In optics, a diffraction grating is an optical component with a periodic structure that splits and diffracts light into several beams traveling in different directions. The emerging coloration is a form of structural coloration. The directions of these beams depend on the spacing of the grating and the wavelength of the light so that the grating acts as the dispersive element. Because of this, gratings are commonly used in monochromators and spectrometers. A diffraction grating is a material that contains a large number of parallel slits separated by a distance (d). This periodic separation of slits is usually on the order of micrometers. Because this distance is on the order of the wavelength of light, when light waves pass through the grating, the slits are able to cause constructive and destructive interference among the light waves. The waves will constructively interfere if the angle of reflection delays one of the waves by a whole wavelength. Diffraction grating equation: m * λ = a * sin(θm) Where: m: The order number of the diffracted image, m = 1,2,3 ... θ: Grating angle, in radians a: Grating Spacing, in lines per meter λ: Wavelength, in meters Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
Metal Detector Pro+
Detect hidden metallic objects and monitor electromagnetic fields using your device's magnetometer. Ideal for construction, treasure hunting, and health safety by identifying EMF radiation from appliances. Receive alerts for high magnetic fields.
- Detect metallic objects in walls and wood
- Monitor EMF radiation from appliances
- Receive audible and vibration alerts
- View magnetic field measurements
- Track detection history
- Suitable for treasure hunting
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Discover the unseen with EMF & Metal Detector Pro, the ultimate tool for detecting hidden metallic objects and monitoring electromagnetic fields (EMF) with your iPhone's built-in magnetometer. Whether you're a professional contractor, a home renovation enthusiast, or an adventurous treasure hunter, this app turns your device into a powerful metal detection and EMF monitoring tool. Key Features: Metal Detection Made Easy: Quickly locate black metal objects hidden in wood, drywall, OSB, plywood, plaster, and more. Ideal for finding studs, screws, and nails, ensuring safety and precision in construction and DIY projects. Treasure Hunting & Ghost Hunting: Unearth buried metallic treasures or embark on a ghost-hunting adventure. Detect magnetized metals hidden underground or behind walls and uncover the mysteries that await. EMF Radiation Detection: Safeguard your health by detecting EMF radiation emitted by household appliances such as plugs, mobile phones, routers, baby monitors, doorbells, intercoms, alarm clocks, electronic devices, wires, and antennas. Stay informed and proactive about the electromagnetic fields in your surroundings. Health Safety Alerts: Receive immediate warnings with an audible beep when high magnetic fields are detected. Take control of your environment and protect yourself and your loved ones from potential health hazards associated with EMF radiation. Health is our most valuable asset. Vibration Notifications & Detailed Readings: The app alerts you with a vibration when ferrous objects are detected. It also provides absolute magnetic field measurements in microteslas (μT), dynamic variations, and a history log for tackling more complex detection tasks. Tips & Tricks: Optimize Your Detection: For best results, remove any cases with metallic or magnetic components before using the app to avoid interference with sensor accuracy. Transform your iPhone into a sophisticated metal and EMF detection device with EMF & Metal Detector Pro. Take charge of your surroundings, ensure structural integrity, and maintain health safety with this indispensable tool. About Subscription: Subscription Services: Weekly subscription, Monthly subscription, Annual subscription. Subscription Price: Weekly subscription is $2.99/week, Monthly subscription is $4.99/month, Lifetime is $8.99. Payment: Payment will be deducted from user's iTunes account, upon confirmation of purchase by user. Renewal: iTunes account will be charged 24 hours before expiration, after successful charge, the subscription period will be extended by 1 cycle. Cancellation: To cancel subscription, please operate at least 24 hours before the end of current cycle. Go to [Settings] > [iTunes Store and App Store] > [Apple ID] > [Subscriptions], and cancel subscription. Privacy Policy: https://emf-detector.netlify.app/emf/privacy Terms of Service: https://emf-detector.netlify.app/emf/terms
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Verdict
The clearest difference is price: Metal Detector Pro+ at Free against Diffraction Grating Calculator's $2.99. Metal Detector Pro+ also leads on update cadence (every 2 months vs every 29 months). Diffraction Grating Calculator's advantage is in-app purchases (none vs 3) and iOS requirement (13 vs 15.0). On ads 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
Metal Detector Pro+ is free to download; Diffraction Grating Calculator costs $2.99 up front. Metal Detector Pro+ sells 3 in-app purchases, starting at $2.99 per 7 days. Diffraction Grating Calculator asks for nothing beyond the download.
Diffraction Grating Calculator ships an update every 29 months, Metal Detector Pro+ every 2 months. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.
| Parameter | Diffraction Grating Calculator | Metal Detector Pro+ |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 4.6 (36 ratings) — better |
| Number of ratings | — | 36 — better |
| Update frequency | Every 29 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13 — better | 15.0 |
| Further details — not scored | ||
| Size | 1 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Nitrio | HyperMind Ltd. |
In-app purchases
Diffraction Grating Calculator
No in-app purchases
Metal Detector Pro+
- Weekly Premium$2.997 Days
- Monthly Premium$4.991 Month
- Lifetime Access$8.99
Questions
Is Diffraction Grating Calculator free?
Is Metal Detector Pro+ free?
Do Diffraction Grating Calculator or Metal Detector Pro+ have ads?
Which is updated more often, Diffraction Grating Calculator or Metal Detector Pro+?
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