Comparison

dnCalc vs Storytime AI

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

Storytime AI

Create unique, personalized stories for children with AI. Customize age-appropriateness, length, and character names. Supports multiple languages and offers various story themes or custom prompts.

Highlights
  • AI-generated stories
  • Personalized story elements
  • Adjustable age-appropriateness
  • Customizable story length
  • Multi-language support
  • Pre-set story themes
Features
Read full description

Generate custom stories for your kids using AI! Storytime AI lets you generate unique, personalized stories to your kid's liking! You can adjust settings for age-appropriateness, story length, or to include your kid’s name in the story. You can then write your own prompts to direct the AI's storytelling (or easily use provided story themes). Also available in multiple languages, including Spanish, Chinese, German, and many more! Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

dnCalc1 screens
Storytime AI4 screens

Verdict

The call

The clearest difference is in-app purchases: dnCalc at none against Storytime AI's 2. dnCalc also leads on review sentiment (100% vs 67%) and device support (3 vs 1). Storytime AI's advantage is update cadence (every 4 days vs fortnightly). On price and ads 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

Both are free to download. Storytime AI sells 2 in-app purchases, starting at $1.99 per month. dnCalc asks for nothing beyond the download.

UpkeepUpdate frequency

dnCalc ships an update fortnightly, Storytime AI every 4 days. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
dnCalc versus Storytime AI: the parameters behind the verdict, then further details
ParameterdnCalcStorytime AI
PriceFreeFree
Rating—2.6 (5 ratings) — better
Positive reviews100.0% of reviews — better66.7% of reviews
Number of ratings—5 — better
Update frequencyFortnightlyEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS11.0 — better17.6
Further details — not scored
Size15 MB17 MB
Age rating4+4+
DeveloperDevious-MonkeyNathan Chan

Customer experience

dnCalc

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

Storytime AI

All ratings5 ratings
Positive40.0%
Neutral0.0%
Negative60.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

None

dnCalc

No in-app purchases

2 purchases

Storytime AI

Subscriptions2
  • Subscription (Monthly)7 Days trial$1.991 Month
  • Subscription (Annually)7 Days trial$19.991 Year

Questions

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

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