Comparison

Ninja Radio vs Kanji Flash Study

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

Head to head
About

Ninja Radio

Features
Read full description

Master Japanese vocabulary naturally with Ninja Radio, your 24/7 live broadcast dedicated to JLPT success. Whether you’re commuting, working out, or relaxing at home, turn your background time into productive study sessions. Ninja Radio is more than just a flashcard appβ€”it’s a synchronized global stream that provides a continuous flow of high-quality Japanese vocabulary, native narrations, and context-rich examples. Tune in at any time and join a community of learners listening to the same live content. KEY FEATURES: * Live 24/7 Broadcast: A never-ending stream of Japanese words and sentences. Just hit play and start learning. * JLPT Focused: Comprehensive coverage from N5 (Beginner) to N1 (Advanced). Customize your experience by selecting your target JLPT levels. * Native Audio: Crisp, clear narrations for every word and example sentence to help you perfect your pitch and pronunciation. * Contextual Learning: Every word is paired with practical example sentences, kana, romaji, and English translations. * Real-time History: Missed a word? Check your history to review recently played vocabulary and see exactly what you just heard. * Background Play: Keep the learning going while you use other apps or when your screen is locked. * Modern Interface: A beautiful, distraction-free design with full support for Dark Mode. Ninja Radio turns the "dead time" in your day into an effortless immersion experience. No planning, no schedulingβ€”just Japanese. Start your immersion journey today with Ninja Radio.

About

Kanji Flash Study

Features
Read full description

Learn and retain Japanese kanji the proven way β€” with spaced repetition. Kanji Flash Study covers all 1,318 kanji from JLPT N5 through N1, complete with meanings, on'yomi and kun'yomi readings, stroke counts, and example vocabulary. The built-in SM-2 algorithm β€” the same system behind Anki β€” schedules your reviews at scientifically optimal intervals so you spend more time on what you're about to forget and less time on what you already know. HOW IT WORKS Pick your JLPT levels and session size, then tap Start Review. Each card shows a kanji character β€” tap to reveal its meaning, readings, and an example word. Rate your recall as Again, Hard, Good, or Easy, and the app adjusts the next review date automatically. Cards you miss are re-queued in the same session so you always end on a strong note. FEATURES - 1,318 kanji across JLPT N5, N4, N3, N2, and N1 - SM-2 spaced repetition for efficient long-term memorization - On'yomi and kun'yomi readings with example words and translations - Searchable kanji library with level filters and progress indicators - Statistics dashboard with streak tracking, accuracy, activity heatmap, and per-level breakdown - Daily study reminders via notifications - Fully offline β€” no account, no internet, no subscriptions - VoiceOver and Reduce Motion accessibility support - Clean, native SwiftUI interface designed for focused study BUILT FOR EVERY LEARNER Whether you're starting with basic N5 kanji or tackling advanced N1 characters, the app adapts to your pace. Select one level or all five β€” your progress is tracked independently for each. YOUR PROGRESS, YOUR DEVICE All study data stays on your device. No sign-up required, no data leaves your phone. Just open the app and start learning.

Screenshots

Ninja Radio4 screens
Kanji Flash Study4 screens

Verdict

The call

Ninja Radio and Kanji Flash Study are too close to call on the numbers: across 5 compared parameters β€” price, ads, in-app purchases and device support among them β€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Neither carries in-app purchases, so what you see is what you pay.

ScorecardNo meaningful differences
Ninja Radio versus Kanji Flash Study: the parameters behind the verdict, then further details
ParameterNinja RadioKanji Flash Study
PriceFreeFree
Update frequencyβ€”Every 3 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod β€” betteriPhone, iPad
Requires iOS15.1 β€” better16.6
Further details β€” not scored
Size35 MB2 MB
Age rating4+4+
DeveloperNonbili Inc.Quinten Sandberg

In-app purchases

None

Ninja Radio

No in-app purchases

None

Kanji Flash Study

No in-app purchases

Questions

Is Ninja Radio free?
Ninja Radio is free to download, with no in-app purchases.
Is Kanji Flash Study free?
Kanji Flash Study is free to download, with no in-app purchases.
Do Ninja Radio or Kanji Flash Study have ads?
Neither Ninja Radio nor Kanji Flash Study shows ads.

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