# Diffraction Grating Calculator vs Resistor AI Calculator

The clearest difference is price: Resistor AI Calculator at Free against Diffraction Grating Calculator's $2.99. Diffraction Grating Calculator's advantage is ads (none vs shown) and iOS requirement (13 vs 15.0). On update cadence, in-app purchases and device support there is nothing between them.

Resistor AI Calculator 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, Resistor AI Calculator every 15 months. The most recent releases landed on May 19, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | Diffraction Grating Calculator | Resistor AI Calculator |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[3.6 (5 ratings)](https://appshunter.io/ios/app/resistor-ai-calculator/id1587462977/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 29 months | **Every 15 months** |
| Monetization | — | Ad-supported |
| Size | 1 MB | 71 MB |
| Requires iOS | **13** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tan Chia Ling](https://appshunter.io/developer/321121189) | [Daichi Takigawa](https://appshunter.io/developer/1569940550) |

## What reviewers say

### Diffraction Grating Calculator

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Resistor AI Calculator

[App page](https://appshunter.io/ios/app/resistor-ai-calculator/id1587462977)

Point your phone's camera at a resistor to instantly identify its value. Currently supports 4-band carbon film resistors with a 5% tolerance.

**Highlights:** Real-time resistor detection, Automatic resistance calculation, Supports 4-band carbon film resistors, 5% margin of error detection, Uses smartphone camera

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Diffraction Grating Calculator free?

Diffraction Grating Calculator costs $2.99, with no in-app purchases.

### Is Resistor AI Calculator free?

Resistor AI Calculator is free to download, with no in-app purchases.

### Do Diffraction Grating Calculator or Resistor AI Calculator have ads?

Resistor AI Calculator shows ads; Diffraction Grating Calculator does not.

### Which is updated more often, Diffraction Grating Calculator or Resistor AI Calculator?

Diffraction Grating Calculator ships an update every 29 months, and Resistor AI Calculator every 15 months. Most recently, Diffraction Grating Calculator was updated on May 19, 2026 and Resistor AI Calculator on June 5, 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.*