Diffraction Grating Calculator vs Unarchiver
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.
Unarchiver
Easily extract, browse, and create archives. Supports a wide range of formats including RAR and ZIP, even password-protected ones. Preview files within archives without full extraction.
- Extracts various archive formats
- Browses archive contents
- Previews files within archives
- Creates new archives
- Supports password-protected archives
- Integrates with share sheets
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Unarchiver is a utility that supports extracting files/folders from archives, browsing, viewing documents in archives and creating archives from files/folders. It support reading rar, zip, 7z, cab, xar, tar, ar, iso, bz2, gz, lz4, lzma, lzip, xz, zst... formats. It also supports reading multi-volume archives and password protected archives. Open a document by opening from the Open an Archive button, or open from share sheet from other apps. Browse the archived contents, click on a folder to view contents of the folder, click on a file to preview the content of the file without unarchiving. Unarchive, unarchive selected items or all items in current directory Archive, by selecting files from the Create an Archive button, support passphrase encryption
Screenshots
Verdict
The clearest difference is price: Unarchiver at Free against Diffraction Grating Calculator's $2.99. Unarchiver also leads on update cadence (fortnightly vs every 29 months). Diffraction Grating Calculator's advantage is iOS requirement (13 vs 16.0). 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
Unarchiver is free to download; Diffraction Grating Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Diffraction Grating Calculator ships an update every 29 months, Unarchiver fortnightly. Both last shipped on October 27, 2026.
| Parameter | Diffraction Grating Calculator | Unarchiver |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 4.6 (326 ratings) — better |
| Positive reviews | — | 90.9% of reviews |
| Number of ratings | — | 326 — better |
| Update frequency | Every 29 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Vision Pro |
| Requires iOS | 13 — better | 16.0 |
| Further details — not scored | ||
| Size | 1 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Nitrio | 林峰 李 |
In-app purchases
Diffraction Grating Calculator
No in-app purchases
Unarchiver
No in-app purchases
Questions
Is Diffraction Grating Calculator free?
Is Unarchiver free?
Do Diffraction Grating Calculator or Unarchiver have ads?
Which is updated more often, Diffraction Grating Calculator or Unarchiver?
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