Native audio for grammar examples and furigana support
Progress dashboards with daily goals and JLPT roadmap
Kanji-focused study and dictionary features are not highlighted, a gap relative to some competitors
Daily lesson structures and extensive reading components are less emphasized here
About Fluency Tool: Shadowing System
Fluency Tool: Shadowing System is an education app developed by Fluency Tool.
Download Statistics
Fluency Tool: Shadowing System has been downloaded 4.4 thousand times. In the last 30 days, the app was downloaded 220 times.
User Ratings
Fluency Tool: Shadowing System is rated 4.20 out of 5 stars. The rating is based on 77 ratings.
App Information
Fluency Tool: Shadowing System is FREE to download. The APK download size is 63.24 MB. The latest version available is 3.0.69. The last update was on September 9, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play April 2024.
Description
Shadow Native Audio. Speak With Confidence (in Japanese or English).
Fluency Tool is a structured speaking and study system built around Echo Fluency: a hands-free shadowing engine that plays a native sentence, opens the microphone automatically, evaluates your pronunciation using speech analysis, and re-queues sentences you get wrong until you get them right. Choose your language, Japanese (JLPT N5–N1) or English (CEFR A1–B2), and stop just listening to it. Start producing it.
Four Tools. One Fluency Loop.
Most language apps isolate one skill and leave you to figure out the rest. Fluency Tool builds four skills in parallel: • Echo Fluency Shadowing Engine: listen, repeat, get graded, advance. Hands-free. • SM-2 Flashcard System (Anki-compatible spaced repetition for your language's vocabulary). • Grammar Guide: every pattern organized by JLPT level (N5–N1) or CEFR level (A1–B2), with native audio and SRS tracking. • Vocabulary Games. Fever Pitch, Hangman, Matching, and Crossword, all built from your own decks.
How Echo Fluency Works
A sentence matched to your level appears (with furigana for Japanese). Native audio plays. The microphone opens automatically. Just repeat what you heard. Your voice plays back immediately so you hear the gap between your output and the native model. Speech-to-text grades your attempt: correct moves you to the next sentence, incorrect re-queues it. Sentences you struggle with return more often. Sentences you master extend their review interval by 4x. The app tracks your personal best for consecutive correct answers per session.
Japanese content covers JLPT N5 through N1 across 25 sub-levels, with a pitch accent visualizer for pronunciation correction. English content covers CEFR A1 through B2. Three recording modes: Echo Fluency (auto), Timed, or Hold to Record.
SM-2 Flashcards (Anki-Compatible)
Rate cards Again, Hard, Medium, or Easy. The SM-2 algorithm calculates exactly when you need to see each word again. Long-press any kanji for a full on'yomi, kun'yomi, and meaning breakdown from KanjiAPI. Preset decks for your level load on first launch. Create custom decks with word, reading, definition, and example. Firebase cloud sync keeps your decks safe across devices; no account needed.
Grammar Guide
Every grammar pattern for your language and level in one reference, with native audio on every example sentence. Tap any pattern for an interactive quiz. Your status tracks as Learning, Reviewing, or Mastered, so you always know what still needs work and what you own.
Vocabulary Games Built From Your Decks
Fever Pitch speed-tap game, Hangman kanji challenge, vocabulary matching, and crossword puzzles all pull from your personal flashcard decks. The words you are actively studying get reinforced in a completely different mode.
Dashboard: Know Exactly What to Do Next
Daily goal tracker with progress bar. 7 and 30-day activity chart. Level roadmap showing remaining content with your current position highlighted. Daily streak tracking. Dark mode. Configurable level, TTS voice, recording mode, and study goal.
Who Downloads Fluency Tool
Learners who can read but still hesitate to speak. One week of Echo Fluency sessions noticeably changes that. Exam candidates (JLPT, CEFR-aligned tests, or otherwise) who need a speaking practice system and a grammar reference in the same app, organized by the same level structure as the exam. Serious learners who know what spaced repetition is, know what shadowing is, and are finished with apps that gamify without producing real speaking ability.
Download free. Start your first Echo Fluency session today.
Get a detailed PDF report for Fluency Tool: Shadowing System with download trends, rating history,
and key performance statistics — useful for competitive research or tracking your own app.
Learn more
Are you the developer of this app? Join us for free to see more information about your app and learn how we can help you promote and earn money with your app.
Comments on Fluency Tool: Shadowing System for Android
★★★★★Antoine ROSSÉ· Feb 3, 2026
Great and simple app for practicing Japanese speaking. Listen to each phrase and repeat it, and thanks to the text-to-speech function, the app checks that the pronunciation is correct.
★★★★★JD· Sep 9, 2024
I am really enjoying Fluency Tool for shadowing practice. There have been noticeable improvements recently, and I can't wait to see what else this app will do.
★★★★★Lee Harper· Apr 29, 2024
A really wonderful app for improving Japanese pronunciation and speaking confidence. As a beginner Fluency Tool is more approachable than Aomi, and more thoughtfully structured than Glossika - with the sentence length and difficulty much less daunting. The immediate feedback is really useful for fine-tuning pronunciation. It's good to hear straight away what sounds good, and what needs a little more practice. The feedback brings fast improvement. A fantastic edition to my 日本語 toolkit!
★☆☆☆☆Lim Xuan· Jul 18, 2024
Didn't work error text to speech initialization failed even after the recent update
★★☆☆☆Geoff B· Apr 21, 2026
The app idea is great but the execution is pretty poor. The app locks up when displaying ads approximately 50% of the time. And the ASR is just Google's native ASR which does a really bad job of picking up single words rather than sentences. This makes it rather frustrating when in the early stages, and it is giving you words rather than sentences or phrases. Also, the app developer has posts on Reddit where they state that the ads are cranked up to be annoying, so you will buy the full version.
★☆☆☆☆Stephen Langley· Mar 24, 2026
Can't get past onboarding into the actual app
Google Play Rankings for Fluency Tool: Shadowing System
This app is not ranked
Technologies used by Fluency Tool: Shadowing System
23 permissions·22 libraries
Subscribe to see full permission and library details
Back to top
AppBrain Intelligence premium content
Subscribe now to get full and unlimited access to AppBrain Intelligence.
You'll have access to:
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
