Comparison

kMath vs Spell Ninja

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

Head to head
About

kMath

Prepare for the International Kangaroo Mathematics Contest with thousands of practice questions and explanations. Covers six levels from grade 1 to 12, with new content updated monthly. Offers an optional subscription for enhanced features.

Highlights
  • Thousands of practice questions
  • Detailed explanations
  • Six learning levels (grade 1-12)
  • Monthly content updates
  • Auto-renewing subscription option
  • Progress tracking
Features
Read full description

Users can prepare for IKMC - International Kangaroo Mathematics Contest with thousands of questions an explanations. New questions and explanations will be updated monthly. There are 6 levels from Pre-Ecolier to Student to practice with variety knowledge from grade 1 to 12. You can upgrade to PRO by purchasing an auto-renewing subscription through an In-App Purchase. • Auto-renewable subscription • 3 month ($14.99) durations • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase • Privacy policy: https://sites.google.com/view/kangaroo-math-app • Terms of Use: https://sites.google.com/view/kmath-terms If you have any problems, please take a screenshot and send it to our email: izi.app.pro@gmail.com . Thank you so much.

About

Spell Ninja

This app helps users prepare for spelling competitions with daily drills, AI coaching, and comprehensive word lists. It offers personalized learning paths and performance analytics to improve spelling accuracy and vocabulary.

Highlights
  • Daily spelling drills
  • AI-powered pattern recognition
  • Progress tracking and analytics
  • Comprehensive word lists
  • Competition simulations
  • Personalized coaching
Features
Read full description

Crush your spelling bee goals with Spell Ninja! Daily Drills, AI Coaching, Comprehensive Word Lists, and Competition Simulations will help your child train like a champion—anytime, anywhere! Spell Ninja is free to download with optional premium features available through monthly and annual subscriptions. Subscriptions unlock advanced word lists/word sets, AI-powered etymology assistance, personalized coaching, and deeper analytics to help students master spelling faster. Whether your child is preparing for school bees, regional competitions, or aiming for the Scripps National Spelling Bee, Spell Ninja provides daily challenges, real-time feedback, and AI-powered learning to stay ahead of the competition. Why Spell Ninja? - Daily Spelling Drills – Build skill, accuracy, and pattern recognition with quick, fun drills. - AI-Powered Pattern Recognition – Learn roots, language origins, etymology patterns, and tricky structures that help decode even the hardest words. - Track Your Progress – Master charts, streaks, performance analytics, and skill-building exercises to measure improvement. - Practice Anytime, Anywhere – Train spelling, vocabulary, synonyms, antonyms, etymology, and more with an exhaustive word database either in short or long sessions. - Perfect for Spelling Bee Competitors – Whether beginner or advanced, the app helps students prepare confidently and compete at the highest level. Who is Spell Ninja For? - Spelling Bee Competitors – Ideal for school, regional, state, and national bees including Scripps. - Parents & Kids – Give your child an edge with structured, intelligent spelling training. - Tutors & Coaches – Use advanced insights, statistics, and customizable word sets to support competitive preparation. - Vocabulary & Etymology Learners – Great for kids who enjoy mastering words, roots, and language patterns. Spell Ninja includes exhaustive word lists for all major spelling competitions, including spelling words, vocabulary words, roots, AI powered spelling and vocabulary hints, and hyphenated/phrase words. Our AI adapts to each student, identifies weak spots, and builds personalized drills for faster mastery. Don’t leave competition results to chance. Download Spell Ninja now and start training like a top spelling champion. For End User License Agreement, Refer To: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

kMath4 screens
Spell Ninja4 screens

Verdict

The call

kMath and Spell Ninja both sit at 4.3 stars, but that hides the real split: 100% of Spell Ninja's written reviews are positive against 71% of kMath's. Spell Ninja also leads on ratings volume (34 vs 6). On price, rating, update cadence 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. kMath sells 1 in-app purchase, starting at $14.99 per 3 months and Spell Ninja sells 6 in-app purchases, starting at $6.99 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 — 4.3 for kMath against 4.2 for Spell Ninja. That said, the two scores are not equally well evidenced: Spell Ninja has 34 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 71% of kMath's written reviews are positive against 100% of Spell Ninja's.

UpkeepUpdate frequency

kMath ships an update every 3 weeks, Spell Ninja every 2 weeks. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 8 level
kMath versus Spell Ninja: the parameters behind the verdict, then further details
ParameterkMathSpell Ninja
PriceFreeFree
Rating4.3 (6 ratings) — better4.2 (34 ratings)
Positive reviews71.4% of reviews100.0% of reviews — better
Number of ratings634 — better
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better14.0.0
Further details — not scored
Size69 MB103 MB
Age rating4+4+
DeveloperYen NguyenDatonique, Inc

Customer experience

kMath

All ratings6 ratings
Positive66.7%
Neutral33.3%
Negative0.0%
Written reviews7 reviews
Positive71.4%
Neutral28.6%
Negative0.0%

Spell Ninja

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

kMath

Subscriptions1
  • Member$14.993 Months
6 purchases

Spell Ninja

Subscriptions6
  • $6.99 Monthly Subscription7 Days trial$6.991 Month
  • $9.99 Monthly Subscription7 Days trial2 variants$9.991 Month
  • $29.99 Monthly Subscription$29.991 Month
Show 3 more
  • $49.99 Annual Subscription7 Days trial$49.991 Year
  • $99 Annual Subscription3 Days trial$99.001 Year
  • $249 Annual Subscription3 Days trial$249.001 Year

Questions

Is kMath free?
kMath is free to download, with in-app purchases available.
Is Spell Ninja free?
Spell Ninja is free to download, with in-app purchases available.
Which has better reviews, kMath or Spell Ninja?
kMath is rated higher. kMath averages 4.3 out of 5 from 6 ratings, while Spell Ninja averages 4.2 from 34 ratings.
Do kMath or Spell Ninja have ads?
Neither kMath nor Spell Ninja shows ads.
Which is updated more often, kMath or Spell Ninja?
kMath ships an update every 3 weeks, and Spell Ninja every 2 weeks. Most recently, kMath was updated on November 8, 2026 and Spell Ninja on October 30, 2026.

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