SD Poker vs LetterRack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SD Poker
This app is a specialized tool for magicians, designed to assist in performing a specific poker-themed magic trick. It analyzes card stacks to help you deal any requested poker hand, with features for customization and presentation.
- Analyzes card stacks for poker hands
- Supports user-defined stacks
- Optimizes for fewest moves
- Stealth mode for hidden assistance
- Proximity sensor for shuffle sound
- Export results via email
- Continuous dealing mode
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IMPORTANT! THIS APP IS FOR MAGICIANS ONLY! IT IS BASED ON PIT HARTLING'S EFFECT 'THE POKER FORMULAS' FROM HIS WONDERFUL BOOK 'IN ORDER TO AMAZE' PUBLISHED IN 2016 (PAGE 102). YOU HAVE TO BE FAMILIAR WITH HIS TRICK TO UNDERSTAND/USE THIS APP. IF YOU ARE NOT FAMILIAR WITH IT, YOU SHOULD ORDER HIS BOOK HERE: www.inordertoamaze.com The App will analyze any stack and tell you when to use SD's in order to receive any poker hand asked for. I refer you to Pit Hartling's book for the general concept. Features: - No internet connection needed Stacks: - Aronson and Tamariz already built in - Up to 10 User-defined stacks can be stored / used Optimizations: - Fewest SD's - 0-SD Rounds - 0-SD's on last Round of Dealing Export Function - Results can be exported and sent by e-mail for further use in different forms Full-House-Coding: - Different Styles on how to indicate the Two-of-a-Kind Continuous Mode - Allows you to continue dealing Poker hands without undoing the last deal. The Programm recalculates the Stack by using the last dealt poker hand. ------------------------ Version 1.1: Stealth-Mode In this mode, the playing cards show the chosen poker hand. The code is secretly hidden inside the playing cards. So the whole presentation can be changed and the iPhone/iPad is only a 'tool' to explain the poker hands, but in reality it helps you to perform the effect. Proximity Shuffle: If the Proximity Sensor of the iPhone is covered in portrait mode (by e.g. the playing cards), the sound of a riffle-shuffle is played. This can be used for the presentation. Disclaimer I have built the app to my best knowledge and it is provided as is without any guarantees or warranty of any kind! If you find a problem / mistake, please let me know and I’ll do my best to fix it. Version 1.1 uses: --------------------------------------------------------------------------- Vectorized Playing Cards 2.0 - http://sourceforge.net/projects/vector-cards/ Copyright 2015 - Chris Aguilar - conjurenation@gmail.com Licensed under LGPL 3 - www.gnu.org/copyleft/lesser.html --------------------------------------------------------------------------- I hope you have a lot of fun with this App and great performances! Martin Eisele P.S. I’d love to get some Feedback from you under sd-poker@martineisele.de
LetterRack
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LetterRack. The Mentalist's Secret Weapon. Mentalism lives on one thing: focus. LetterRack gives your spectator exactly what their mind needs to lock onto a thought. Three powerful effects, one elegant tool: A spectator thinks of a random word generated by the app. The mentalist reads their mind. A spectator unscrambles an anagram and focuses on the hidden word. The mentalist reads their mind. A spectator freely chooses any word. The mentalist reads their mind. Three different paths. One impossible outcome. Full control for the performer: LetterRack gives mentalists full control over their letter sets, preparing, organizing, customizing, and cycling through words with precision, so the performer can focus entirely on the audience, not the mechanics. Instant sharing, zero friction: Generate a QR code in seconds and let your spectator scan it with their iPhone. No app download required. They land directly via App Clip, turning their own phone into part of the effect. Always within reach: A Home Screen widget keeps your current word visible at a glance, ready the moment you need it. They think it. You know it. Word lists currently available in English only. Additional languages coming in future updates. The app is free to download and try with up to 5 words. The widget and Apple Watch complication are free to install but show only the first letter of the word. Full word display, App Clip, custom word lists, and advanced word management require an Xtremagic Pass subscription or one-time purchase.
Screenshots
Verdict
The clearest difference is price: LetterRack at Free against SD Poker's $59.99. LetterRack also leads on update cadence (every 3 weeks vs every 8 months). SD Poker's advantage is in-app purchases (none vs 3) and device support (4 vs 2). On ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
LetterRack is free to download; SD Poker costs $59.99 up front. LetterRack sells 3 in-app purchases, starting at $3.99 per month. SD Poker asks for nothing beyond the download.
SD Poker ships an update every 8 months, LetterRack every 3 weeks. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.
| Parameter | SD Poker | LetterRack |
|---|---|---|
| Price | $59.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 8 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, Apple Watch |
| Requires iOS | 12.0 — better | 26.4 |
| Further details — not scored | ||
| Size | 27 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Eisele | Vincent Launay |
In-app purchases
SD Poker
No in-app purchases
LetterRack
- Xtremagic Pass$3.991 Month
- Xtremagic Pass$24.991 Year
- Full Access (One-Time Purchase)$7.99









