Comparison

dnCalc vs Unlock by JM Magic

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Reveal secret numbers
  • Peek at ages and zodiac signs
  • Calculate birth day of week
  • Create custom formulas
  • Works offline
  • Up to 5 participants
Features
Read full description

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

About

Unlock by JM Magic

Features
Read full description

UNLOCK — A Magician's Secret Turn the familiar iPhone lock screen into a powerful tool for magic. UNLOCK is designed for magicians who want a natural, customizable and convincing lock-screen experience for their performances. CREATE YOUR OWN LOOK Customize wallpapers, time formats, lock-screen elements and the overall visual style. Choose between a classic interface or a realistic iPhone-inspired experience. CONTROL THE PASSCODE EXPERIENCE Configure the passcode screen, number of digits, attempt behavior, peek settings and other performance options. Build the exact experience you need for your routine. PERFORM YOUR WAY Fine-tune the lock screen and presentation before performing. Make the experience match your style, your routine and your audience. BUILT FOR MAGICIANS UNLOCK is created specifically with magic performances in mind — giving performers the control they need to create natural-looking and memorable moments. Whether you're performing close-up magic, mentalism or a digital magic routine, UNLOCK puts the presentation in your hands. Your screen. Your settings. Your performance. UNLOCK — A Magician's Secret.

Screenshots

dnCalc1 screens
Unlock by JM Magic4 screens

Verdict

The call

The clearest difference is update cadence: Unlock by JM Magic at every 3 days against dnCalc's fortnightly. dnCalc's advantage is iOS requirement (11.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

dnCalc ships an update fortnightly, Unlock by JM Magic every 3 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

Scorecard2 real differences Ā· 6 level
dnCalc versus Unlock by JM Magic: the parameters behind the verdict, then further details
ParameterdnCalcUnlock by JM Magic
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyFortnightlyEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS11.0 — better15.1
Further details — not scored
Size15 MB36 MB
Age rating4+4+
DeveloperDevious-MonkeyBhavik Shah

In-app purchases

None

dnCalc

No in-app purchases

None

Unlock by JM Magic

No in-app purchases

Questions

Is dnCalc free?
dnCalc is free to download, with no in-app purchases.
Is Unlock by JM Magic free?
Unlock by JM Magic is free to download, with no in-app purchases.
Do dnCalc or Unlock by JM Magic have ads?
Neither dnCalc nor Unlock by JM Magic shows ads.
Which is updated more often, dnCalc or Unlock by JM Magic?
dnCalc ships an update fortnightly, and Unlock by JM Magic every 3 days. Most recently, dnCalc was updated on November 4, 2026 and Unlock by JM Magic on October 31, 2026.

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