# LED Calc. vs Resistor Tools

The clearest difference is rating: Resistor Tools at 5.0 against LED Calc.'s 1.0. Resistor Tools also leads on ads (none vs shown) and review sentiment (75% vs 50%). LED Calc.'s advantage is in-app purchases (none vs 1). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Resistor Tools sells 1 one-off in-app purchase. LED Calc. asks for nothing beyond the download.

Resistor Tools holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Resistor Tools has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of LED Calc.'s written reviews are positive against 75% of Resistor Tools's.

LED Calc. ships an update every 10 months, Resistor Tools every 2 months. The most recent releases landed on June 5, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | LED Calc. | Resistor Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/led-calc/id556845805/reviews) | **[5.0 (10 ratings)](https://appshunter.io/ios/app/resistor-tools/id826045228/reviews)** |
| Number of ratings | 1 | **10** |
| Positive reviews | 50.0% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 17 MB | 4 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jibiki Works](https://appshunter.io/developer/556845808) | [Siu Yuen Ho](https://appshunter.io/developer/814088527) |

## What reviewers say

### LED Calc.

[App page](https://appshunter.io/ios/app/led-calc/id556845805)

This application assists in designing electronic circuits by calculating the necessary resistor values for LEDs. It simplifies the process of determining the correct components for your LED projects.

**Highlights:** Resistor value calculation, LED circuit design assistance, Component value determination

**Features:** macOS Compatibility

**In-app purchases:** none


### Resistor Tools

[App page](https://appshunter.io/ios/app/resistor-tools/id826045228)

This utility app provides a suite of tools for calculating and determining resistor values. It assists hobbyists and engineers with series, parallel, and voltage divider calculations, as well as inverting amplifier gain.

**Highlights:** Series and parallel resistor calculation, Resistor combination finder, Voltage divider ratio and value calculation, Inverting amplifier gain calculation, Save combinations to CSV

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock pro feature | $0.99 | one-time |


## Frequently asked questions

### Is LED Calc. free?

LED Calc. is free to download, with no in-app purchases.

### Is Resistor Tools free?

Resistor Tools is free to download, with in-app purchases available.

### Which has better reviews, LED Calc. or Resistor Tools?

Resistor Tools is rated higher. LED Calc. averages 1.0 out of 5 from 1 ratings, while Resistor Tools averages 5.0 from 10 ratings.

### Do LED Calc. or Resistor Tools have ads?

LED Calc. shows ads; Resistor Tools does not.

### Which is updated more often, LED Calc. or Resistor Tools?

LED Calc. ships an update every 10 months, and Resistor Tools every 2 months. Most recently, LED Calc. was updated on June 5, 2026 and Resistor Tools on September 24, 2026.

---

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