# LetterRack vs MemDatStack

The clearest difference is in-app purchases: MemDatStack at none against LetterRack's 3. MemDatStack also leads on update cadence (every 9 days vs every 3 weeks) and iOS requirement (18.6 vs 26.4). On price, ads and device support there is nothing between them.

Both are free to download. LetterRack sells 3 in-app purchases, starting at $3.99 per month. MemDatStack asks for nothing beyond the download.

LetterRack ships an update every 3 weeks, MemDatStack every 9 days. The most recent releases landed on September 12, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | LetterRack | MemDatStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/memdatstack/id6766251270/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | — | Free |
| Size | 28 MB | 6 MB |
| Requires iOS | 26.4 | **18.6** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Vincent Launay](https://appshunter.io/developer/1198218316) | [Circe Apps LLC](https://appshunter.io/developer/1896252845) |

## What reviewers say

### LetterRack

[App page](https://appshunter.io/ios/app/letterrack/id6764377699)

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Xtremagic Pass | $3.99 | per month |
| Xtremagic Pass | $24.99 | per year |
| Full Access (One-Time Purchase) | $7.99 | one-time |


### MemDatStack

[App page](https://appshunter.io/ios/app/memdatstack/id6766251270)

This tool assists magicians in memorizing card stacks with customizable quizzes. It supports various popular stacks and question types, offering detailed feedback on incorrect answers to improve learning.

**Highlights:** Supports multiple popular card stacks, Variety of quiz settings, Customizable quiz questions, Tracks recent quiz results, Reviews incorrect answers, Audio feedback option

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LetterRack free?

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

### Is MemDatStack free?

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

### Do LetterRack or MemDatStack have ads?

Neither LetterRack nor MemDatStack shows ads.

### Which is updated more often, LetterRack or MemDatStack?

LetterRack ships an update every 3 weeks, and MemDatStack every 9 days. Most recently, LetterRack was updated on September 12, 2026 and MemDatStack on September 21, 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.*