Comparison

Ruidaichan vs Kanji Drills

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

Head to head
About

Ruidaichan

Features
Read full description

Create printable math worksheets from elementary school word problems. This app automatically generates similar practice worksheets (A4 size) from a photo of a math problem. Designed for elementary school students, especially grades 1–3, to practice word problems and basic calculations at home. Great for extra practice when children need more repetition with the same type of problems. 【Good for situations like】 * Homework is not enough practice * You want more problems of the same type * Review elementary school word problems * Print worksheets at home * Create extra worksheets for cram schools or tutoring * Add review problems for classrooms or after-school programs * Give similar but different worksheets to each student 【Features】 * Scan math problems using OCR (photo text recognition) * Automatically generate similar practice questions * Create printable A4 PDF worksheets * Save, share, and print generated worksheets 【How to use】 1. Take a photo of a math problem 2. Generate a similar worksheet 3. Print or share the PDF worksheet Free monthly usage is available. Images and OCR text are only sent for worksheet generation and are not stored. Q. Can 4th graders use this app? A. Yes. While mainly designed for grades 1–3, it can also be used for 4th grade review and extra practice. Q. Can it generate only word problems? A. Yes. The app supports generating similar word problems. Q. Can I print the worksheets? A. Yes. Generated worksheets can be printed on A4 paper using home printers or convenience store printing services. Q. Can I save worksheets as PDF files? A. Yes. Worksheets can be saved and shared as PDF files. Q. Can it generate more problems of the same type? A. Yes. The app creates similar practice problems based on the original question. Q. Is it useful for homeschooling or home learning? A. Yes. It is designed for home learning, review practice, and extra exercises. Q. Does the app use OCR? A. Yes. The app reads math problems from photos using OCR technology. Q. Does it support calculation problems too? A. Yes. Both word problems and basic calculation problems are supported. Q. What type of learning app is this? A. This is a printable worksheet generation and review-focused math learning app that uses OCR to read problems and generate similar worksheets. Q. What situations is this app used for? A. It is used for home learning, cram school review worksheets, classroom review practice, homework support, and repeated practice of weak areas. Q. Can teachers use this app? A. Yes. Teachers, tutors, and cram schools can use it to quickly create additional practice worksheets. Terms of Use: https://github.com/MakikoOhashi/kima-app-policies/blob/main/ruidaichan-terms.md Privacy Policy: https://github.com/MakikoOhashi/kima-app-policies/blob/main/ruidaichan-privacy.md

About

Kanji Drills

Create custom kanji worksheets for children in grades 1-6, aligned with Japan's official curriculum. Personalize drills to match school pace or focus on difficult characters. Print or share as PDFs without needing physical workbooks.

Highlights
  • Customizable kanji worksheets
  • Aligned with Japanese curriculum (Grades 1-6)
  • Printable and shareable PDFs
  • Three worksheet types (Copy, Dictation, Reading)
  • Four ordering modes
  • Star difficult kanji
  • Authentic Japanese drill layout
Features
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Custom kanji worksheets fully aligned with Japan's official elementary school curriculum (Grades 1 to 6, 1,026 characters). Designed for Japanese-speaking households at home and abroad - perfect for families using Japanese supplementary schools (hoshuko) or following the domestic curriculum from overseas. Note: The app interface is in Japanese. The worksheets follow the Japanese Ministry of Education kanji curriculum. Match your child's actual school pace, drill 10 kanji at a time, or focus on the ones they struggle with. Personalized worksheets, printable or shareable as PDF, without ever buying another drill book. All 1,026 kanji from Japan's Ministry of Education grade-level curriculum (2020 revision) are included. Choose from three worksheet styles and four ordering modes for endless practice. Built for real study routines - Endless fresh worksheets, so your child never reuses the same drill - Star difficult kanji and have them appear more often - Match the school's pace, or work ahead unit by unit - Save hours of preparation for cram-school teachers - Authentic Japanese drill layout your child will recognise Complete kanji coverage All 1,026 grade-level kanji from Grade 1 through Grade 6, fully aligned with the Japanese Ministry of Education's 2020 revision. Three worksheet types Copy Practice: a model square, traceable squares, and repeat squares to build correct character form. Dictation: write the kanji from hiragana hints, with example phrases for context. Reading: write the correct reading from the kanji. Four ordering modes Curriculum Order: follow the school sequence step by step. Random: get a fresh combination every time. Unit Mode: drill 10 kanji at a time for planned coverage (Pro). Weak-First: prioritize the kanji you starred as difficult (Pro). Authentic print layout - Mincho-style typography close to Japanese school textbooks - Tianzige practice grids for proper character balance - Header with school name, class, student name, date and score - A4 and B5 paper size switching (Pro) - Bundled answer-sheet PDF for fast grading (Pro) Who it is for - Parents of children studying Japanese kanji - Teachers at cram schools, primary schools and tutoring centres - Heritage learners and Japanese-language students - Anyone preparing for the Kanji Kentei exam Pricing Free - One full-quality lifetime trial print - Full preview of every worksheet type - Free choice of grade and ordering mode Pro (monthly or annual) - Unlimited print and PDF generation - Weak-kanji starring - Unit-based ordering - Bundled answer-sheet PDF - A4 and B5 paper size switching - School and class name printed on worksheets - Ad-free experience About the subscription - Pro is a monthly or annual auto-renewing subscription. - It renews automatically at the same price unless cancelled at least 24 hours before the end of the current period. - You can cancel anytime via Settings, Apple ID, Subscriptions on iOS. - Price is shown in the App Store at the time of purchase. Terms of Service and Privacy Policy https://lineocean.com/kanjiworksheetmaker Turn every day into a small "I got it" moment for your child. Start with one worksheet, on us.

Screenshots

Ruidaichan3 screens
Kanji Drills4 screens

Verdict

The call

The clearest difference is ads: Ruidaichan at none against Kanji Drills's shown. Ruidaichan also leads on update cadence (every 5 days vs every 2 weeks) and iOS requirement (16.6 vs 18.2). On price, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Ruidaichan sells 2 in-app purchases, starting at $1.99 per month and Kanji Drills sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Ruidaichan ships an update every 5 days, Kanji Drills every 2 weeks. Both last shipped on October 31, 2026.

Scorecard3 real differences Β· 5 level
Ruidaichan versus Kanji Drills: the parameters behind the verdict, then further details
ParameterRuidaichanKanji Drills
PriceFreeFree
Positive reviewsβ€”100.0% of reviews
Update frequencyEvery 5 days β€” betterEvery 2 weeks
AdsNo β€” betterYes
In-app purchasesYesYes
Monetizationβ€”Free with in-app purchases
DevicesiPhoneiPhone
Requires iOS16.6 β€” better18.2
Further details β€” not scored
Size18 MB10 MB
Age rating4+4+
DeveloperNaoki OhashiFumihiro Kawasaki

In-app purchases

2 purchases

Ruidaichan

Subscriptions2
  • Light Plan$1.991 Month
  • Premium Plan$4.991 Month
3 purchases

Kanji Drills

Subscriptions2
  • Kanji Worksheet Pro – Monthly$2.991 Month
  • Kanji Worksheet Pro – Yearly$24.991 Year
One-time1
  • ε…¨ζ©Ÿθƒ½γ‚’θ§£ζ”ΎοΌˆθ²·γ„εˆ‡γ‚ŠοΌ‰$5.99

Questions

Is Ruidaichan free?
Ruidaichan is free to download, with in-app purchases available.
Is Kanji Drills free?
Kanji Drills is free to download, with in-app purchases available.
Do Ruidaichan or Kanji Drills have ads?
Kanji Drills shows ads; Ruidaichan does not.
Which is updated more often, Ruidaichan or Kanji Drills?
Ruidaichan ships an update every 5 days, and Kanji Drills every 2 weeks. Most recently, Ruidaichan was updated on October 31, 2026 and Kanji Drills on October 31, 2026.

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