Comparison

dnCalc vs The Grid

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

The Grid

Features
Read full description

The Grid is a magic app that will allow you to perform an INTERACTIVE MAGIC TRICK using images. You can perform The Grid on the phone of all your spectators at the same time, without limit of spectators. The Grid is ideal to amaze small or large groups of people on the real world and also is amazing for streaming platforms like zoom, meet, etc. Also you can perform The Grid on your phone, without an internet connection, showing your screen to a small group of spectators. Welcome to The Grid the INTERACTIVE MAGIC APP!

Screenshots

dnCalc1 screens
The Grid3 screens

Verdict

The call

The clearest difference is update cadence: dnCalc at fortnightly against The Grid's every 3 months. dnCalc also leads on iOS requirement (11.0 vs 15.6). 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, The Grid every 3 months. The most recent releases landed on November 11, 2026 and November 13, 2026 respectively.

Scorecard2 real differences Ā· 6 level
dnCalc versus The Grid: the parameters behind the verdict, then further details
ParameterdnCalcThe Grid
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyFortnightly — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.6
Further details — not scored
Size15 MB38 MB
Age rating4+4+
DeveloperDevious-MonkeyJavier Franco

In-app purchases

None

dnCalc

No in-app purchases

None

The Grid

No in-app purchases

Questions

Is dnCalc free?
dnCalc is free to download, with no in-app purchases.
Is The Grid free?
The Grid is free to download, with no in-app purchases.
Do dnCalc or The Grid have ads?
Neither dnCalc nor The Grid shows ads.
Which is updated more often, dnCalc or The Grid?
dnCalc ships an update fortnightly, and The Grid every 3 months. Most recently, dnCalc was updated on November 11, 2026 and The Grid on November 13, 2026.

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