# Diffraction Grating Calculator vs WalterAI

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.

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.

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.

## The numbers

| Metric | Diffraction Grating Calculator | WalterAI |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.7 (228 ratings)](https://appshunter.io/ios/app/walterai-searchask-anything/id1664266337/reviews)** |
| Number of ratings | — | **228** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Monthly** |
| Monetization | — | Free |
| Size | 1 MB | 2 MB |
| Requires iOS | **13** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Walter Labs, Inc.](https://appshunter.io/developer/1491248520) |

## What reviewers say

### Diffraction Grating Calculator

[App page](https://appshunter.io/ios/app/diffraction-grating-calculator/id1413088894)

**Features:** macOS Compatibility

**In-app purchases:** none


### WalterAI

[App page](https://appshunter.io/ios/app/walterai-searchask-anything/id1664266337)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Offers depth of knowledge
- 👍 Organized responses
- 👍 Great for quick consults
- 👍 Accurate responses
- 👍 Loved the snoop dog feature

**What reviewers complain about**

- 👎 Limited daily access/questions
- 👎 Search results are poor
- 👎 Provides incorrect answers
- 👎 Not enough facts provided
- 👎 Limitations compared to web search

**Reported bugs**

- Error occurred
- Too many requests

**Requested features**

- Generate pictures
- More facts provided
- Unlimited questions/tokens
- Ability to copy text results


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*