# Knot Guide HD vs LED Resistor Calculator Plus

The clearest difference is review sentiment: Knot Guide HD at 77% against LED Resistor Calculator Plus's 0%. Knot Guide HD also leads on update cadence (every 12 months vs every 47 months) and iOS requirement (11.0 vs 13). LED Resistor Calculator Plus's advantage is rating (4.8 vs 4.1) and price ($2.99 vs $4.99). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Knot Guide HD costs $4.99 and LED Resistor Calculator Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LED Resistor Calculator Plus holds the better App Store score, 4.8 against 4.1. Both are backed by a comparable volume of ratings — 23 and 8 respectively. Written reviews complicate that: 77% of Knot Guide HD's written reviews are positive against 0% of LED Resistor Calculator Plus's, so the app with the better star average is not the one people write more warmly about.

Knot Guide HD ships an update every 12 months, LED Resistor Calculator Plus every 47 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Knot Guide HD | LED Resistor Calculator Plus |
| --- | --- | --- |
| Price | $4.99 | **$2.99** |
| Rating | [4.1 (23 ratings)](https://appshunter.io/ios/app/knot-guide-hd/id374225992/reviews) | **[4.8 (8 ratings)](https://appshunter.io/ios/app/led-resistor-calculator-plus/id1369457811/reviews)** |
| Number of ratings | **23** | 8 |
| Positive reviews | **77.4% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 12 months** | Every 47 months |
| Monetization | Paid | Paid |
| Size | 99 MB | 1 MB |
| Requires iOS | **11.0** | 13 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Winkpass Creations, Inc.](https://appshunter.io/developer/288636661) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Knot Guide HD

[App page](https://appshunter.io/ios/app/knot-guide-hd/id374225992)

Learn to tie over 100 different knots with clear, step-by-step instructions and photographs. This app categorizes knots for easy browsing and provides detailed descriptions for each one, making it a practical tool for various activities.

**Highlights:** 107 unique knots, Clear, colorful photographs, Browse by category or knot name, Detailed knot descriptions, Categorized knot library

**Features:** macOS Compatibility

**In-app purchases:** none


### LED Resistor Calculator Plus

[App page](https://appshunter.io/ios/app/led-resistor-calculator-plus/id1369457811)

Calculate the correct series resistor needed to safely power light-emitting diodes. Input supply voltage, LED voltage drop, current, and the number of LEDs to find the required resistor value and wattage.

**Highlights:** Calculate series resistor value, Determine resistor power dissipation, Recommend resistor wattage, Supports multiple LEDs in series, Input supply voltage, LED voltage, and current

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Knot Guide HD free?

Knot Guide HD costs $4.99, with no in-app purchases.

### Is LED Resistor Calculator Plus free?

LED Resistor Calculator Plus costs $2.99, with no in-app purchases.

### Which has better reviews, Knot Guide HD or LED Resistor Calculator Plus?

LED Resistor Calculator Plus is rated higher. Knot Guide HD averages 4.1 out of 5 from 23 ratings, while LED Resistor Calculator Plus averages 4.8 from 8 ratings.

### Do Knot Guide HD or LED Resistor Calculator Plus have ads?

Neither Knot Guide HD nor LED Resistor Calculator Plus shows ads.

### Which is updated more often, Knot Guide HD or LED Resistor Calculator Plus?

Knot Guide HD ships an update every 12 months, and LED Resistor Calculator Plus every 47 months. Most recently, Knot Guide HD was updated on November 1, 2026 and LED Resistor Calculator Plus on November 6, 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.*