Comparison

dnCalc vs ACAAT CHRONOMASTER

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

ACAAT CHRONOMASTER

This app allows users to force card positions and numbers within stacks, offering multiple input methods and advanced customization. It supports integrations with other platforms and provides developers with an API for custom solutions.

Highlights
  • Stack forcing
  • Number forcing
  • Remote control input
  • Lockscreen input
  • Multi-forcing up to 3 numbers
  • Pre-record numbers
  • Webhook integration
Features
Read full description

Core Features Recap The classic features that made the app a success are back: Stack Forcing: Force a card’s position in any stack. Number Forcing: Direct number forcing. Integrations: Full Flitch integration. Input Methods: Input via Inject. Input via Remote Control. Input via Lockscreen (New!). What's New in 2026 The application has undergone a total rewrite and redesign for maximum power and flexibility: Multi-Forcing: Force up to 3 numbers consecutively. Pre-sets: Pre-record numbers to force in advance. Configurable Workflow: Fully customize how your effects play out. Activation Methods: Various new ways to trigger the force discreetly. Inject Output: Now compatible with Inject for output (sending data out). Flitch 2.0: Simplified and optimized management of Flitch effects. Advanced Connectivity: Dedicated API for developers. Webhook Integration (allows connection to automation platforms like n8n). ...and more features are on the way!

Screenshots

dnCalc1 screens
ACAAT CHRONOMASTER4 screens

Verdict

The call

The clearest difference is price: dnCalc at Free against ACAAT CHRONOMASTER's $69.99. dnCalc also leads on in-app purchases (none vs 2) and iOS requirement (11.0 vs 17.1). ACAAT CHRONOMASTER's advantage is update cadence (every 3 days vs fortnightly). On review sentiment, ads 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

CostPrice · In-app purchases · Ads · Monetization

dnCalc is free to download; ACAAT CHRONOMASTER costs $69.99 up front. ACAAT CHRONOMASTER sells 2 one-off in-app purchases. dnCalc asks for nothing beyond the download.

UpkeepUpdate frequency

dnCalc ships an update fortnightly, ACAAT CHRONOMASTER every 3 days. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

Scorecard5 real differences · 5 level
dnCalc versus ACAAT CHRONOMASTER: the parameters behind the verdict, then further details
ParameterdnCalcACAAT CHRONOMASTER
PriceFree — better$69.99
Rating—5.0 (1 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—1 — better
Update frequencyFortnightlyEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS11.0 — better17.1
Further details — not scored
Size15 MB8 MB
Age rating4+4+
DeveloperDevious-Monkeysebastien macak

Customer experience

dnCalc

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ACAAT CHRONOMASTER

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews19 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

dnCalc

No in-app purchases

2 purchases

ACAAT CHRONOMASTER

One-time2
  • acaat watch compagnon$19.99
  • ACAAT Appclip config$22.99

Questions

Is dnCalc free?
dnCalc is free to download, with no in-app purchases.
Is ACAAT CHRONOMASTER free?
ACAAT CHRONOMASTER costs $69.99, and also offers in-app purchases.
Do dnCalc or ACAAT CHRONOMASTER have ads?
Neither dnCalc nor ACAAT CHRONOMASTER shows ads.
Which is updated more often, dnCalc or ACAAT CHRONOMASTER?
dnCalc ships an update fortnightly, and ACAAT CHRONOMASTER every 3 days. Most recently, dnCalc was updated on October 13, 2026 and ACAAT CHRONOMASTER on October 12, 2026.

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