Comparison

Mathmaji vs Kai Reads

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

Head to head
About

Mathmaji

This app offers a K-5 math curriculum using the Japanese method of structured problem-solving. It features over 500 exercises designed to build confidence, comprehension, and mental calculation skills. Track progress with a comprehensive learning management system.

Highlights
  • K-5 numerical math curriculum
  • 500+ engaging exercises
  • Japanese instruction techniques
  • Tailored lessons and games
  • Comprehensive Learning Management System
  • Boosts confidence and comprehension
Features
Read full description

Mathmaji is an award-winning educational experience that puts the proven Japanese method of structured problem solving at your child's fingertips. Mathmaji is the only math app with a complete K-5 numerical math curriculum to teach new concepts, and our 500+ engaging exercises are specially designed to hone problem-solving skills. Mathmaji’s innovative combination Japanese instruction techniques and tailored lessons, games, and practice exercises earned it the Asian EdTech Summit Global Award Gold Prize and the Global EdTech Startup Award. ·    Build a strong foundation in essential math skills, boosting confidence and comprehension. ·    Master new concepts and apply them to real-world problems, develop a strong number sense, and learn methods for quick mental calculation. ·    Find out how the Japanese approach to math ed takes the mystery out of multiplication, division, and other concepts that may have your student stumped. ·    Track your student’s progress with Mathmaji’s comprehensive Learning Management System. Get two weeks full access for FREE. Say goodbye to math anxiety! With Mathmaji, a few minutes a day is all it takes to make math your child’s favorite subject!

About

Kai Reads

Features
Read full description

Kai Reads turns learning to read into a real adventure. Join Kai, a curious kid explorer, on a trip across four planets — each one built around a different reading skill kids need to become confident readers. WHAT KAI READS TEACHES Dino Planet — Sound It Out Practice phonics by sounding out letters one at a time, then blast the word to watch it come together. Haunted Moon — Build Words Drag letter tiles into the right order to build spelling and word-construction skills. Web Station — Catch Sight Words Quick-recognition rounds for the high-frequency "sight words" every early reader needs to know by heart. Story Planet — Read a Story Short, illustrated stories read aloud line by line, building reading fluency and a love of stories. NOW SUPPORTS IPHONE DUO Kai Reads now supports iPhone Duo. Closed, open, or partly open, in landscape or portrait, every screen adapts to the fold and stays centered and readable, clear of the camera and status area. BUILT FOR REAL KIDS, NOT JUST SCREENS Kai Reads speaks every word aloud using natural, on-device speech — no internet required to play. In Parent Settings, grown-ups can fine-tune the speaking speed and voice pitch, and pick from the best voice installed on the device (including Apple's Enhanced and Premium voices, when downloaded). STARS, STICKERS & GOALS Every correct answer earns a star. Earn 5 stars in a game to unlock its collectible sticker in Kai's Sticker Book. Parents can set daily and weekly star goals from Parent Settings, and Kai cheers when a goal is hit — turning practice into a small, repeatable win instead of an open-ended screen session. GAME CENTER Total stars and unlocked stickers sync to Game Center, so progress is never lost and kids can see their own growth over time. MADE FOR PARENTS WHO ARE PICKY ABOUT SCREEN TIME No ads. No in-app purchases. No accounts, logins, or data collection beyond what's needed for Game Center. Just a focused, kid-safe reading game designed to be handed to a young reader with nothing to worry about. Kai Reads works on iPhone (including iPhone Duo) and iPad, in landscape or portrait, and is best enjoyed with the sound on.

Screenshots

Mathmaji4 screens
Kai Reads4 screens

Verdict

The call

The clearest difference is in-app purchases: Kai Reads at none against Mathmaji's 2. Mathmaji's advantage is update cadence (weekly vs every 6 weeks) and iOS requirement (14.0 vs 26.5). On price, 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

Both are free to download. Mathmaji sells 2 in-app purchases, starting at $15.00 per month. Kai Reads asks for nothing beyond the download.

UpkeepUpdate frequency

Mathmaji ships an update weekly, Kai Reads every 6 weeks. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

Scorecard3 real differences · 7 level
Mathmaji versus Kai Reads: the parameters behind the verdict, then further details
ParameterMathmajiKai Reads
PriceFreeFree
Rating4.1 (9 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings9 — better—
Update frequencyWeekly — betterEvery 6 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better26.5
Further details — not scored
Size82 MB17 MB
Age rating4+4+
DeveloperMathmaji Co., Ltd.Victor Galloza

In-app purchases

2 purchases

Mathmaji

Subscriptions2
  • Plus Monthly(1 Month)14 Days trial$15.001 Month
  • Plus Annual (1 Year)14 Days trial$124.991 Year
None

Kai Reads

No in-app purchases

Questions

Is Mathmaji free?
Mathmaji is free to download, with in-app purchases available.
Is Kai Reads free?
Kai Reads is free to download, with no in-app purchases.
Do Mathmaji or Kai Reads have ads?
Neither Mathmaji nor Kai Reads shows ads.
Which is updated more often, Mathmaji or Kai Reads?
Mathmaji ships an update weekly, and Kai Reads every 6 weeks. Most recently, Mathmaji was updated on October 24, 2026 and Kai Reads on October 16, 2026.

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