Is Fluency Tool free?

Yes. All core learning features — Echo Fluency speaking sessions, flashcards, grammar guide, and vocabulary games — are completely free. There is an optional one-time purchase to remove ads.

★ Free · Android · JLPT N5 → N1

Stop just studying Japanese.
Start speaking it.

Echo Fluency builds real speaking confidence through hands-free shadowing — training your rhythm, pitch, and muscle memory. Flashcards, a full JLPT grammar guide, and vocab games tie everything into one daily program.

Best for learners who already read hiragana and katakana. New to kana? Start with Kana Challenge →

Download Free on Google Play See how it works ↓

4.8 · 320+ reviewsFree core · No subscription🌐 Multi-language UI

Fluency Tool dashboard with daily goal and activity chart

Echo Fluency speech-to-text correction screen

Dashboard — daily goal & activity chart

JLPT Levels

Content Sub-Levels

Learning Modes

SRS Engines

⚙ The System

Four tools. One fluency loop.

Most apps drill a single skill and leave the rest to you. Fluency Tool builds four in parallel — and each one sharpens the others.

Echo Fluency
speaking engine

Listen to a native sentence, repeat it, hear yourself, get graded. The full hands-free loop. Sentences you struggle with re-queue automatically.

Cloud TTSSTT EvaluationCustom SRS

SM-2 flashcard
vocabulary

Anki's algorithm. Rate cards Again, Hard, Medium, Easy — the system schedules each word for the perfect moment. Long-press any kanji for a full breakdown.

SM-2Kanji LookupCloud Sync

JLPT grammar
guide N5–N1

Every JLPT pattern from N5 through N1 with native audio on every example. Tap to take an interactive quiz. Status tracks Learning, Reviewing, Mastered.

All 5 LevelsNative AudioSRS Tracking

Vocabulary games
& crosswords

Speed Tap, matching, Fever Pitch, and JP crosswords — all built from your own decks. The same words, reinforced through different mechanics.

Your DecksSpeed TapCrossword

🎙 Echo Fluency

The fastest path to speaking confidently.

Shadowing is what professional language learners do — listen to native audio and immediately repeat it. Echo Fluency automates the whole cycle.

▶ Try the loop · N5 sentencecard 03 / N5-1

今日きょうは天気てんきがいいですね。

kyō wa tenki ga ii desu ne.

"The weather is nice today, isn't it?"

Tap mic · listen, then repeatAuto-record starts after the prompt plays.

Native sentence plays

A JLPT-graded sentence appears with furigana. High-quality cloud TTS plays the native audio. You listen.

Auto-record starts

The microphone opens automatically after playback. Just repeat. No tapping.

Your voice plays back

You hear yourself immediately. The gap between you and the native model becomes obvious — and that's where the improvement happens.

Instant evaluation

Speech-to-text grades your pronunciation. ✅ Correct → next sentence. ❌ Incorrect → re-queued until you nail it.

SRS schedules your return

Master a sentence five times and the review interval multiplies by 4×. Time goes to what needs work, not what you already own.

Three recording modes

Echo Fluency (Auto) — full hands-free cycle. Recommended.

Timed — TTS plays, then a fixed recording window opens.

Hold to Record — push-to-talk. Full manual control.

Content structured by JLPT level

Advanced

5 sub-levels · complex grammar & literary forms

Upper-Intermediate

5 sub-levels · nuanced expression & reading fluency

Intermediate

5 sub-levels · everyday conversation & conjunctions

Elementary

5 sub-levels · basic sentences & common patterns

Beginner

5 sub-levels · foundational vocab & survival phrases

25 content buckets total — your Roadmap tracks real progress across all sub-levels.

🗂 Flashcards

Vocabulary that actually sticks.

SM-2 spaced repetition — the same algorithm powering Anki — surfaces each card at the perfect moment. Zero time on words you already know.

How SM-2 works

Rate → schedule → review at the perfect moment

Again

Resets to Learning. Short interval. Ease drops.

Hard

Interval shrinks. Stays in Learning. Ease drops.

Medium

Standard SM-2. Interval × ease factor.

Easy

Interval extends further. Ease rises. Heads weekly.

💡 After 5+ correct reviews a card enters mature territory — multi-week intervals, no time wasted on what you already own.

Everything in the deck system

✓JLPT preset decks — N5–N1 vocabulary imported on first launch.
✓Custom decks — word, reading, definition, example.
✓Kanji long-press — full on'yomi, kun'yomi, meanings.
✓SRS status badges — New, Due Now, Later-Today counts at a glance.
✓Furigana toggle — show or hide hiragana above kanji.
✓Cloud backup — Firebase sync across devices.

Deep feature

Kanji breakdown on demand

Long-press any Japanese word during a session to open a sheet with the full Kuromoji breakdown — definition, reading, plus character-by-character analysis from KanjiAPI.dev.

音読み On'yomi

Chinese-derived

訓読み Kun'yomi

Native Japanese

名乗り Names

Name readings

Meanings

English defs

📊 Dashboard

Open the app. Know exactly
what to do next.

No guesswork. No decision fatigue. The Dashboard tells you where you stand and what needs attention right now.

📅

Daily goal tracker

Sentences completed vs. your daily target. Progress bar turns green when you hit your goal. Cards-due count always visible.

📈

Activity chart

Bar chart of daily completions over the past 7 or 30 days, with your goal line. Visualize consistency at a glance.

🗺️

JLPT roadmap

Horizontal bar chart of remaining new sentences across all 25 sub-levels. Your current position highlighted.

🔔

Study reminders

Configurable daily notifications keep your streak alive. Set once and forget.

⚙️

Configurable settings

JLPT level, sub-level, TTS voice, sentence speed, recording mode, dark mode — all adjustable per session.

☁️

Cloud data sync

Firebase-backed backup for decks and SRS progress. Restore on any device in one tap. Anonymous auth — no account needed.

👤 Who it's for

This app was built for you if…

🌱

You can read hiragana & katakana

Set your level to N5 Sub-level 1. The beginner course covers foundational vocab and survival phrases, with furigana on by default.

🎓

You're preparing for JLPT

All content is organised by JLPT level. Drill the patterns and vocabulary that actually appear on the exam.

🗣️

You can read but can't speak

Echo Fluency was built for exactly this. You already have the vocabulary — your mouth just needs to catch up with your eyes.

📺

You're an anime or manga fan

Stop relying on subtitles. Shadowing native audio + SRS vocab is the shortest path to understanding what you're hearing.

✈️

You're travelling to Japan soon

The N5 beginner course includes a survival track — essential phrases for travellers who need practical Japanese fast.

🏔️

You're pushing toward N1

Echo Fluency at native speed, complex grammar, literary forms — the Roadmap shows which N1 sub-levels still need work.

📖

Not reading kana yet?

Fluency Tool assumes you can already read hiragana and katakana. If not, Kana Challenge is the recommended starting point — a 30-day course to fluency in both scripts.

Start with Kana Challenge →

Build confidence, rhythm & pitch.
One app. Every day.

Echo Fluency trains speaking from the inside out — muscle memory, natural rhythm, real pronunciation. Core app is free. Download takes 30 seconds.

Download Free — Android

Free core · Optional one-time purchase to remove ads · No subscription

📱 Inside the app

See it in action.

Real screens. Clean, distraction-free, built for focused daily sessions.

Fluency Tool dashboard with activity chart and daily goal

Echo Fluency live recording session with speech feedback

Flashcard deck manager with SRS status badges

JLPT grammar guide with N3 pattern examples

Flashcard study screen with SM-2 rating buttons

JLPT roadmap with 25 sub-level progress bars

Japanese crossword puzzle using vocabulary from active decks

★ Reviews

What learners are saying

4.8

320+ Google Play reviews

"Really good app for speaking Japanese! Listen to each phrase and repeat it, and thanks to the text-to-speech, the app checks your pronunciation."

▶

Google Play User

5-star review

"I really enjoy this app a lot and I cannot believe it is free. TIP: Hold your finger on a kanji and it explains each one. This could be the best Japanese learning tool out there."

▶

Google Play User

5-star review

"Best support I ever received. The mic wasn't working properly and the dev fixed it almost immediately. Amazing app for shadowing!"

▶

Google Play User

5-star review

"I am learning Japanese and it really helped me. Very useful app and clean UI design."

▶

Google Play User

5-star review

"Very helpful, I genuinely wanted to learn Japanese since I started watching anime. This app helps me navigate native phrases."

▶

Google Play User

5-star review

"Great and simple app for practising Japanese speaking. The shadowing flow is exactly what I needed."

▶

Google Play User

5-star review

? FAQ

Frequently asked questions

Everything you need to know before you download.

Is Fluency Tool completely free?

Yes. Echo Fluency, all flashcard features, the full JLPT N5–N1 grammar guide, vocabulary games, and crosswords are completely free. There's an optional one-time purchase to remove banner ads — the full learning system costs nothing.

What JLPT levels does Fluency Tool cover?

All five JLPT levels — N5 (absolute beginner) through N1 (near-native advanced). Each is split into 5 sub-levels for 25 distinct content buckets. The Dashboard Roadmap shows your remaining new sentences across all 25.

What is Echo Fluency and how does it work?

The app's core speaking mode. A native sentence plays via cloud TTS, your mic opens automatically, your voice plays back, then speech-to-text compares your pronunciation. Correct sentences get scheduled for later. Missed ones re-queue. Hands-free.

How does the spaced repetition work?

Two SRS systems run in parallel. Flashcards use SM-2 (Anki's algorithm) with Again / Hard / Medium / Easy ratings that adjust intervals. Speaking sentences use a custom algorithm where mastering 5× triggers a 4× interval bonus.

Do I need prior Japanese knowledge to start?

Yes — you should be able to read hiragana and katakana. Once you can, set your level to N5 Sub-level 1 and the app starts with foundational vocabulary. Furigana displays above kanji. The onboarding wizard walks through every preference.

Does the app work offline?

Flashcard study, vocabulary games, and crossword puzzles work fully offline. Echo Fluency requires an internet connection for cloud TTS audio playback and speech-to-text evaluation. The grammar guide loads web content and needs connectivity.

Is there an iPhone version?

Not yet — Fluency Tool is Android-only today. iOS users can join the waitlist to be notified when a build ships. In the meantime, the web-based Grammar Library works on any device.

Can I use Fluency Tool alongside Kana Challenge?

Absolutely — they're a progression. Kana Challenge gets you reading hiragana and katakana fluently in 30 days. Once you know kana, Fluency Tool's Echo Fluency, flashcards, and grammar guide pick up from there.

🌐 My Senpai ecosystem