# PCalc vs Memory Knots

The clearest difference is review sentiment: PCalc at 84% against Memory Knots's 33%. PCalc also leads on rating (4.7 vs 3.4) and update cadence (every 6 weeks vs every 23 months). Memory Knots's advantage is price ($0.99 vs $9.99) and in-app purchases (none vs 4). On ads there is nothing between them.

PCalc costs $9.99 and Memory Knots $0.99 up front. PCalc sells 4 one-off in-app purchases. Memory Knots asks for nothing beyond the download.

PCalc holds the better App Store score, 4.7 against 3.4. That said, the two scores are not equally well evidenced: PCalc has 770 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 84% of PCalc's written reviews are positive against 33% of Memory Knots's.

PCalc ships an update every 6 weeks, Memory Knots every 23 months. The most recent releases landed on September 30, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | PCalc | Memory Knots |
| --- | --- | --- |
| Price | $9.99 | **$0.99** |
| Rating | **[4.7 (770 ratings)](https://appshunter.io/ios/app/pcalc/id284666222/reviews)** | [3.4 (9 ratings)](https://appshunter.io/ios/app/memory-knots/id1595137169/reviews) |
| Number of ratings | **770** | 9 |
| Positive reviews | **83.6% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 23 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#85** | — |
| Size | 81 MB | 3 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch, Vision Pro** | iPhone, Apple Watch |
| Age rating | 4+ | 9+ |
| Developer | [TLA Systems Ltd.](https://appshunter.io/developer/284666225) | [Golmium](https://appshunter.io/developer/887238485) |

## What reviewers say

### PCalc

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

**Currently charting:** #85 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

**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 |


### Memory Knots

[App page](https://appshunter.io/ios/app/memory-knots/id1595137169)

Enhance your recall with color-coded reminders that are always accessible. This tool is ideal for managing multiple tasks, from academic schedules to daily errands, ensuring you stay organized and on track.

**Highlights:** Color-coded memory hints, Intuitive reminder system, Task management for busy individuals, Watch face complications for quick access, Instant app access from watch face

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is PCalc free?

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

### Is Memory Knots free?

Memory Knots costs $0.99, with no in-app purchases.

### Which has better reviews, PCalc or Memory Knots?

PCalc is rated higher. PCalc averages 4.7 out of 5 from 770 ratings, while Memory Knots averages 3.4 from 9 ratings.

### Do PCalc or Memory Knots have ads?

Neither PCalc nor Memory Knots shows ads.

### Which is updated more often, PCalc or Memory Knots?

PCalc ships an update every 6 weeks, and Memory Knots every 23 months. Most recently, PCalc was updated on September 30, 2026 and Memory Knots on September 24, 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.*