Comparison

21 Sharp vs WordWiz

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

Head to head
About

21 Sharp

Master blackjack strategy and card counting with this professional-grade trainer. Learn optimal plays, practice counting systems, and track your progress with realistic simulations and reference guides. Reduce the house edge and gain a competitive advantage.

Highlights
  • Basic strategy training
  • Card counting drills (Hi-Lo)
  • Realistic practice table
  • Reference guides
  • Progress tracking and achievements
Features
Read full description

Turn the odds in your favor. 21 Sharp is a professional-grade blackjack trainer that teaches you basic strategy and card counting—the same techniques used by advantage players to beat the house. BASIC STRATEGY TRAINING Learn the mathematically optimal play for every possible hand. Our quiz system drills you on 270+ hand combinations until perfect strategy becomes second nature. Reduce the house edge to just 0.5%. CARD COUNTING DRILLS Master the Hi-Lo counting system with speed-building exercises. Track running counts, calculate true counts, and learn when to increase your bets. Practice until you can count down a full shoe with accuracy. PRACTICE TABLE Play realistic blackjack hands with real-time strategy hints. See the running count, get recommendations for every decision, and learn from your mistakes without risking real money. REFERENCE GUIDES Access complete basic strategy charts and a comprehensive Hi-Lo counting guide anytime. Perfect for quick review before hitting the casino. TRACK YOUR PROGRESS Unlock 25+ achievements as you improve. Monitor your accuracy, streaks, and stats across all training modes. Watch yourself transform from beginner to sharp. Whether you're preparing for Vegas, want to impress at home games, or just love the math behind the game, 21 Sharp gives you the edge. Play Sharp. Win Sharp.

About

WordWiz

Instantly define words and build a personalized vocabulary library. This app creates flashcards and quizzes using research-backed memorization techniques to help you learn and remember new words effectively.

Highlights
  • Instant word definition
  • Personalized flashcard creation
  • Varied quiz generation
  • Evidence-informed review techniques
  • Vocabulary library organization
  • Curated word collections
  • Detailed learning progress tracking
Read full description

Instantly define any word and automatically add it to your organized vocabulary library. WordWiz then turns your saved words into personalized flashcards and quizzes using modern, research-evidence based memorization strategies such as active recall, spaced review, and repeated practice to help you remember more over time. Define any word instantly, then turn it into personalized flashcards and smart quizzes designed to help you learn them. WordWiz transforms every unfamiliar word into a complete learning experience. Save a word, view its definition and examples, and automatically add it to your organized vocabulary library. WordWiz then creates varied quizzes, focused flashcards, and timed reviews using research-informed learning techniques such as active recall, spaced review, and repeated retrieval. Whether you are improving your writing, preparing for school, strengthening your professional vocabulary, or simply learning new words, WordWiz gives every word a clear path from discovery to mastery. DEFINE ANY WORD INSTANTLY Enter an unfamiliar word and quickly view its meaning, examples, pronunciation, and other helpful learning details. AUTOMATICALLY CREATE FLASHCARDS Every saved word becomes a personalized flashcard, allowing you to review definitions, test your memory, and build familiarity at your own pace. GENERATE SMART, VARIED QUIZZES Practice with multiple question types designed to strengthen recognition, understanding, and recall—not just simple memorization. LEARN WITH EVIDENCE-INFORMED REVIEWS WordWiz uses active recall, spaced review, repeated practice, answer difficulty, and learning progress to help schedule more effective future reviews. GET INSTANT FEEDBACK See whether your answer was correct, review corrections immediately, and rate words as Hard, Got It, or Easy to help WordWiz adjust your upcoming practice. BUILD YOUR PERSONAL VOCABULARY LIBRARY Keep definitions, examples, learning progress, collections, and flagged words organized in one convenient place. EXPLORE CURATED WORD COLLECTIONS Discover ready-made vocabulary sets covering clearer writing, commonly confused words, critical thinking, professional communication, advanced everyday vocabulary, and more. TRACK DETAILED LEARNING PROGRESS Monitor quiz accuracy, mastered words, learning goals, daily activity, review performance, and overall vocabulary growth from your personal dashboard. PRACTICE YOUR WAY Start a quick daily quiz, review previous mistakes, study flashcards, explore curated collections, or take on larger vocabulary challenges. WordWiz helps you do more than look up definitions. It helps you actively learn, practice, and remember every word you discover. Define it. Practice it. Remember it. Subscriptions WordWiz Plus Monthly is an auto-renewable 1-month subscription. WordWiz Plus Annual is an auto-renewable 1-year subscription. Prices are shown in the app and vary by region. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://lecoffeeconfit-cmd.github.io/wordwiz-legal/

Screenshots

21 Sharp4 screens
WordWiz4 screens

Verdict

The call

21 Sharp and WordWiz are too close to call on the numbers: across 8 compared parameters — price, rating, ratings volume and ads among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. 21 Sharp sells 1 one-off in-app purchase and WordWiz sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for 21 Sharp against 5.0 for WordWiz. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

ScorecardNo meaningful differences
21 Sharp versus WordWiz: the parameters behind the verdict, then further details
Parameter21 SharpWordWiz
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Number of ratings11
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.016.4 — better
Further details — not scored
Size1 MB76 MB
Age rating12+4+
Developerbusyslacker llcHoward Tran

In-app purchases

1 purchases

21 Sharp

One-time1
  • 21 Sharp Premium$2.99
2 purchases

WordWiz

Subscriptions2
  • WordWiz Plus Monthly$1.991 Month
  • WordWiz Plus Annual$14.991 Year

Questions

Is 21 Sharp free?
21 Sharp is free to download, with in-app purchases available.
Is WordWiz free?
WordWiz is free to download, with in-app purchases available.
Which has better reviews, 21 Sharp or WordWiz?
21 Sharp and WordWiz are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do 21 Sharp or WordWiz have ads?
Neither 21 Sharp nor WordWiz shows ads.

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