Calculator Quest vs Kon21
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Calculator Quest
This app merges a functional calculator with role-playing game elements. It offers a "Calc mode" for standard calculations, a fast-typing number game, and a mental arithmetic challenge.
- Standard calculator functionality
- Fast-typing number game
- Mental arithmetic time attack
- RPG elements
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A calculator and an RPG combine to form a miraculous hybrid! Includes bonus quick-typing game and math game! ※Rest assured, this app also works as a calculator. - Use for regular calculator operations! Calc mode! - Type the numbers and symbols as fast as you can! Quickdraw Colosseum! - Try your hand at the “mental arithmetic” time attack mode in Mental Math Kingdom!
Kon21
Embark on a cosmic adventure to restore balance to chaotic zodiac realms. Battle evolving creatures using a unique blackjack-inspired card system and master the art of 21 to unleash powerful attacks. Explore pixel-crafted worlds with a retro aesthetic.
- Explore living zodiac realms
- Conway-powered evolving creatures
- Strategic blackjack-inspired combat
- Master the art of 21
- Retro pixel aesthetic
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KON21: THE ZODIAC WARRIOR A long time ago, across distant constellations, the zodiac realms fell into chaos. Ancient creatures now roam the stars — their forms evolving, shifting, and living through the mysterious patterns of Conway’s Game of Life. Only one warrior can restore balance. Will you master the sacred art of 21? --- EXPLORE LIVING WORLDS Traverse pixel-crafted zodiac realms filled with dynamic, evolving creatures. No two encounters are ever the same. CONWAY-POWERED CREATURES Enemies are alive. Their patterns shift, grow, and change based on cellular automata mechanics inspired by Conway’s Game of Life. STRATEGIC CARD BATTLES Engage in unique blackjack-inspired combat. Push your luck, outplay your opponent, and strike at the perfect moment. MASTER THE ART OF 21 Balance risk and reward as you build your hand and unleash powerful attacks tied to zodiac energy. RETRO PIXEL AESTHETIC A nostalgic visual experience with modern gameplay depth. Clean, minimal, and designed for immersive play. --- Will you conquer the zodiac realms… or be consumed by the chaos? Download KON21 and begin your journey.
Screenshots
Verdict
The clearest difference is rating: Kon21 at 5.0 against Calculator Quest's 4.1. Kon21 also leads on ads (none vs shown) and update cadence (every 4 days vs every 4 months). Calculator Quest's advantage is ratings volume (14 vs 1) and iOS requirement (15.0 vs 26.2). On price, in-app purchases, monetization model 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Kon21 holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Calculator Quest has 14 ratings behind it against 1, so its average is the more settled of the two.
Calculator Quest ships an update every 4 months, Kon21 every 4 days. The most recent releases landed on October 29, 2026 and October 7, 2026 respectively.
| Parameter | Calculator Quest | Kon21 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (14 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 72.3% of reviews | — |
| Number of ratings | 14 — better | 1 |
| Update frequency | Every 4 months | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 9 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Masakazu Yonehara | RetroApps LLC |
Customer experience
Calculator Quest
Kon21
Bugs and requests
Calculator Quest
Reported bugs
4 issues- App crashes immediately after killing monsters
- Ads showing up on the top blocking off numbers
- App needs to be updated for iOS 11
- Can't use on new iPhone
Requested features
13 requests- Pay to remove ads option
- Offline play option
- More games to play
- Increase calculation level
- Add different calculation types (add, subtract, multiply, divide)
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- Add maps and companions for RPG elements
- Make game the main focus, not calculator
- Add hidden command games
- More gameplay features
- Enhance calculation function
- Make questions harder with progression
- Add items like skipping problems
- Update for newer iOS versions
Kon21
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Calculator Quest
No in-app purchases
Kon21
No in-app purchases
Questions
Is Calculator Quest free?
Is Kon21 free?
Which has better reviews, Calculator Quest or Kon21?
Do Calculator Quest or Kon21 have ads?
Which is updated more often, Calculator Quest or Kon21?
Other comparisons
