Fluency Tool: Shadowing System

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.