# PCalc vs Knot Guide HD

The clearest difference is rating: PCalc at 4.7 against Knot Guide HD's 4.1. PCalc also leads on update cadence (every 6 weeks vs every 12 months) and ratings volume (779 vs 23). Knot Guide HD's advantage is in-app purchases (none vs 4) and price ($4.99 vs $9.99). On review sentiment and ads there is nothing between them.

PCalc costs $9.99 and Knot Guide HD $4.99 up front. PCalc sells 4 one-off in-app purchases. Knot Guide HD asks for nothing beyond the download.

PCalc holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: PCalc has 779 ratings behind it against 23, so its average is the more settled of the two. Written reviews point the same way: 83% of PCalc's written reviews are positive against 77% of Knot Guide HD's.

PCalc ships an update every 6 weeks, Knot Guide HD every 12 months. The most recent releases landed on November 10, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | PCalc | Knot Guide HD |
| --- | --- | --- |
| Price | $9.99 | **$4.99** |
| Rating | **[4.7 (779 ratings)](https://appshunter.io/ios/app/pcalc/id284666222/reviews)** | [4.1 (23 ratings)](https://appshunter.io/ios/app/knot-guide-hd/id374225992/reviews) |
| Number of ratings | **779** | 23 |
| Positive reviews | **83.4% of reviews** | 77.4% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 12 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#94** | — |
| Size | 83 MB | 99 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch, Vision Pro** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [TLA Systems Ltd.](https://appshunter.io/developer/284666225) | [Winkpass Creations, Inc.](https://appshunter.io/developer/288636661) |

## What reviewers say

### PCalc

[App page](https://appshunter.io/ios/app/pcalc/id284666222)

**Currently charting:** #94 Top Paid · Utilities (US App Store)

A powerful calculator designed for professionals and students, offering advanced features like RPN mode, multi-line display, and extensive unit conversions. It supports various number systems and includes an Apple Watch app for on-the-go calculations.

**Highlights:** Optional RPN mode, Multi-line display, Extensive unit conversions, Paper tape, Multiple undo/redo, Hexadecimal, octal, binary support, Apple Watch app

**Features:** Apple Watch app, iMessage stickers, Fun Camera support, iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $1.99 | one-time |
| Large Tip | $4.99 | one-time |
| Enormous Tip | $9.99 | one-time |


### 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


## Frequently asked questions

### Is PCalc free?

PCalc costs $9.99, and also offers in-app purchases.

### Is Knot Guide HD free?

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

### Which has better reviews, PCalc or Knot Guide HD?

PCalc is rated higher. PCalc averages 4.7 out of 5 from 779 ratings, while Knot Guide HD averages 4.1 from 23 ratings.

### Do PCalc or Knot Guide HD have ads?

Neither PCalc nor Knot Guide HD shows ads.

### Which is updated more often, PCalc or Knot Guide HD?

PCalc ships an update every 6 weeks, and Knot Guide HD every 12 months. Most recently, PCalc was updated on November 10, 2026 and Knot Guide HD on November 1, 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.*