Comparison

Diffraction Grating Calculator vs WalterAI

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

Head to head
About

Diffraction Grating Calculator

Features
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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.

About

WalterAI

This app leverages AI to answer questions, generate content, translate languages, and summarize text. It can assist with writing essays, composing emails, and even completing sentences. Users can search for information using text or photos.

Highlights
  • AI-powered search
  • Content generation
  • Language translation
  • Text summarization
  • Essay and note writing
  • Email composition
Features
Read full description

WalterAI can: Translate languages, generate content, and answer any question you may have.  It uses all the information it has to guess the answer, so please take the answer with a grain of salt. You Can Search anything:  - How to make Pizza - What should I do to motivate myself? - How do I go viral on TikTok? - How should I say “Good morning in Spanish? Write essays and notes: - Write me an essay about the history of Mars. - Write me an outline on how to grow a palm tree. Compose content:  - Give me 10 dad jokes. Summarize text: - Summarize the history of the United States. - Summarize the story of Cinderella. - Summarize the process of making electricity. Complete text: - Complete the following sentence: “You already know who it is…” Compose emails: - What should I say in an email to ask for a refund? Our AI uses all the information it has to guess the answer, so please take The Answer with a grain of salt. Search anything:  - How to make Pizza - Who is charli d'amelio dating ? - What should I do to motivate myself? - How do I go viral on TikTok? - How should I say “Good morning in Spanish? Write essays and notes: - Write me an essay about the history of Mars. - Write me an outline on how to grow a palm tree. Compose content:  - Give me 10 dad jokes. Summarize text: - Summarize the history of the United States. - Summarize the story of Cinderella. - Summarize the process of making electricity. Complete text: - Complete the following sentence: “You already know who it is…” Compose emails: - What should I say in an email to ask for a refund?

Screenshots

Diffraction Grating Calculator4 screens
WalterAI4 screens

Verdict

The call

The clearest difference is price: WalterAI at Free against Diffraction Grating Calculator's $2.99. WalterAI also leads on update cadence (monthly vs every 29 months). On ads, in-app purchases, device support and iOS requirement 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

WalterAI 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.

UpkeepUpdate frequency

Diffraction Grating Calculator ships an update every 29 months, WalterAI monthly. The most recent releases landed on September 29, 2026 and October 15, 2026 respectively.

Scorecard2 real differences · 8 level
Diffraction Grating Calculator versus WalterAI: the parameters behind the verdict, then further details
ParameterDiffraction Grating CalculatorWalterAI
Price$2.99Free — better
Rating—4.7 (228 ratings) — better
Positive reviews—60.0% of reviews
Number of ratings—228 — better
Update frequencyEvery 29 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13 — better14.0
Further details — not scored
Size1 MB2 MB
Age rating4+12+
DeveloperNitrioWalter Labs, Inc.

Bugs and requests

Diffraction Grating Calculator

Not enough reviews yet to summarise bugs or requests.

WalterAI

Reported bugs

2 issues
  • Error occurred
  • Too many requests

Requested features

4 requests
  • Generate pictures
  • More facts provided
  • Unlimited questions/tokens
  • Ability to copy text results

In-app purchases

None

Diffraction Grating Calculator

No in-app purchases

None

WalterAI

No in-app purchases

Questions

Is Diffraction Grating Calculator free?
Diffraction Grating Calculator costs $2.99, with no in-app purchases.
Is WalterAI free?
WalterAI is free to download, with no in-app purchases.
Do Diffraction Grating Calculator or WalterAI have ads?
Neither Diffraction Grating Calculator nor WalterAI shows ads.
Which is updated more often, Diffraction Grating Calculator or WalterAI?
Diffraction Grating Calculator ships an update every 29 months, and WalterAI monthly. Most recently, Diffraction Grating Calculator was updated on September 29, 2026 and WalterAI on October 15, 2026.

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