# dnCalc — Amaze your friends! > A magic trick app that reveals secret numbers and personal details through mathematical illusions. (iPhone/iPad app by Devious-Monkey.) - Source: https://appshunter.io/ios/app/dncalc/id1309683648 (this page in markdown: same URL + `.md`) - Developer: [Devious-Monkey](https://appshunter.io/developer/388388527) - Category: Entertainment, Utilities - Price: Free (on sale, was $14.99) - Age rating: 4+ - Requires: iOS 11.0 · 15 MB - Languages: American English - Released: 2017-11-14 - Data updated: 2026-08-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/dncalc/id1309683648/reviews.md ## What is dnCalc? 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 ## Key features - Reveal secret numbers - Peek at ages and zodiac signs - Calculate birth day of week - Create custom formulas - Works offline - Up to 5 participants ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/dncalc/id1309683648/reviews.md ### 5/5 — DnCalc *2018-01-17* Superbe application magique. Elle ne cesse d’évoluer grâce à son créateur qui assure un excellent Suivi. Si vous avez des questions, il vous répond rapidement et efficacement. Pour étonner votre famille et vos amis!! ## Frequently asked questions about dnCalc ### How does dnCalc work? dnCalc enables you to perform mathematical "experiences" where you can reveal secret numbers, ages, or zodiac signs chosen by volunteers. The app guides you through a procedure that allows you to deduce these secrets based on the final result provided by your friends. ### Can I use dnCalc without an internet connection? Yes, dnCalc does not require an internet connection to perform its demonstrations, making it perfect for use anywhere, anytime. ### Is dnCalc suitable for all ages? dnCalc has an age rating of 4+, indicating it is suitable for a wide audience. The app is designed to be very easy to do, with a PDF explaining the procedure in detail. ### How many people can participate in a dnCalc demonstration? Up to 5 people can be involved in a single demonstration with dnCalc. The spectators manipulate the calculator, and you do not need to touch it yourself. ### Can I customize the tricks in dnCalc? Yes, dnCalc allows you to build your own forcing and peeking formulas, enabling you to adapt the demonstrations to your wishes and context. You can also force any number you need. ### How often is dnCalc updated? The latest version of dnCalc is 1.42, last updated on March 28, 2025. This indicates regular updates to maintain and potentially enhance the app's functionality. ### Does dnCalc have ads? No, dnCalc does not contain advertisements. The app is free to download and use without any ad interruptions. ### What devices is dnCalc compatible with? dnCalc is compatible with iPhone, iPad, and iPod devices. It is designed to run on Apple's iOS platform. ## Version history (last 5 releases) ### 1.42 — 2025-03-28 Technical update. ### 1.41 — 2020-05-28 Added dynamic forcing module. ### 1.39 — 2018-02-09 Internal corrections. ### 1.38 — 2018-02-01 Added mappings formula function. ### 1.36 — 2018-01-14 Various corrections. ## More apps by Devious-Monkey - [Stack Master](https://appshunter.io/ios/app/stack-master/id1272229335) - [Magic Klondike](https://appshunter.io/ios/app/magic-klondike/id1294707765) - [(in)cohérence](https://appshunter.io/ios/app/incoherence/id1450929024) All apps by Devious-Monkey: https://appshunter.io/developer/388388527 ## Related topics [drastic calc](https://appshunter.io/ios/topics/drastic-calc) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*