SD Poker vs dnCalc
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
dnCalc
Perform amazing mathematical "experiences" to impress friends and colleagues. This app allows you to reveal secret numbers, ages, zodiac signs, and more, all without touching a calculator. It's easy to use, requires no memorization, and can be done with your eyes closed.
- Reveal secret numbers
- Peek at ages and zodiac signs
- Calculate birth day of week
- Create custom formulas
- Works offline
- Up to 5 participants
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Imagine... You are enjoying a lunch with friends and you suggest to perform a strange mathematical "experience". You ask for several volunteers to think of a special number, a birthday, the age of their best friend... You then ask them to multiply these numbers together, without you being able to see anything, then multiply the result by a special number that you previously wrote on a piece of paper, before the demonstration begins. Your friends give you orally the final result of these operations. You close your eyes and after a few seconds you reveal in the right order, the secret numbers of your friends! dnCalc will allow you to easily produce this little miracle that you can adapt according to your wishes and to he context. Your friends or colleagues will be asking what magical mathematical operation you mentally do to "extract" their numbers. Guaranteed to impress! • Very easy to do. A PDF document explains in details the procedure (which you can adapt). • Nothing to memorize. • Up to 5 people can be involved in the demonstration. • The spectators manipulate the calculator, you do not touch anything. • You can do this demonstration with your eyes closed. • No need for internet connection. • The trick is absolutely undetectable, nothing to find. • The effect is reproducible several times in a row. Many other cool features : • Force any number you need. • Compute and peek the age of your volunteer. • Compute and peek his zodiac signs (classic or Chinese). • Compute and peek his birth day of week. • Build your own forcing/peeking formulas! *** IMPORTANT *** If you have questions, do not ask them in the app's reviews, in order to preserve the secret. Send an email to dnCalc@moult.org. Thank you ! Alistair Crompton
Screenshots
Verdict
The clearest difference is price: dnCalc at Free against SD Poker's $59.99. dnCalc also leads on update cadence (fortnightly vs every 8 months). On review sentiment, ads, in-app purchases and device support 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
dnCalc is free to download; SD Poker costs $59.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SD Poker ships an update every 8 months, dnCalc fortnightly. The most recent releases landed on October 18, 2026 and October 13, 2026 respectively.
| Parameter | SD Poker | dnCalc |
|---|---|---|
| Price | $59.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Every 8 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 27 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Eisele | Devious-Monkey |
Customer experience
SD Poker
dnCalc
In-app purchases
SD Poker
No in-app purchases
dnCalc
No in-app purchases









