Features
A/B Looping
Press A to mark the start and B to mark the end; the player loops that range. Dragging the boundaries is free; the dedicated dial button on the waveform panel opens a millisecond-precision dial — a Pro feature.
Smart Auto-Segmentation
Silero-VAD voice-activity detection splits a recording into sentence-level segments automatically. Configurable max segment length.
Difficulty Management
Rate each segment by difficulty and mark it mastered to see what needs more practice at a glance. Filter by difficulty to focus on weak spots first.
Shadow Reading
Three phases: listen to the original → record yourself → align and score. Pronunciation (MFCC/formant DTW) and rhythm (RMS/F0) scoring, with Encouraging / Standard / Challenging presets.
Auto Intensive-Listening Workflow
One tap: segment → loop → shadow-score. Set loops per segment; the player advances to the next un-mastered segment automatically. Built for high-volume practice.
Fine-Grained Segment Editing
Split, merge, rate difficulty, mark mastery, add notes and translations. Every line is precisely managed; filter to drill only what you have not mastered. Auto silence trim is a Pro feature.
Wi-Fi Cross-Screen Dictation
A built-in phone HTTP server: bulk-uploading audio to your computer browser is always free. Doing dictation on the big screen while listening is a Pro feature; phone and web stay in sync.
Learning Stats
Practice time, streaks, mastery progress, bottleneck segments, 30-day trends — quantify your progress. Built-in guided lessons help you ramp up on the core workflow; both stats and lessons are always free.
iOS Free vs Pro
One-time purchase (iOS), 7-day free trial before you buy
| Free | Pro | |
|---|---|---|
| Included in Free | ||
| Core playback: player / A-B loop / waveform / speed / gap / lock-screen playback | Fully free | — |
| Import files (local files / share sheet / photo library / iCloud) | Fully free | — |
| Manual segment workbench (excluding auto silence trim) | Fully free | — |
| Difficulty management (rating + mastery marks + filtering) | Fully free | — |
| Wi-Fi bulk upload | Unlimited | — |
| Phone dictation (edit, notes, subtitles) | Unlimited | — |
| Export/share segments + import your own segment archive | Unlimited | — |
| Learning Center lessons + practice stats | Fully free | — |
| Full backup (export + restore) | Always free | — |
| Unlocked with Pro | ||
| VAD auto-segmentation / LRC・SRT subtitle import | First 180s of each file only | Full-length audio, no cap |
| Web Wi-Fi cross-screen dictation | Available on built-in material only | Available on any audio |
| Shadow reading (record + pronunciation/rhythm scoring) | Available on built-in material only | Available on any audio |
| Smart training workflow (auto-loop + extra reps by difficulty) | Available on built-in material only | Available on any audio |
| Rotary-dial A/B fine-tuning (drag-to-adjust stays free) | Unavailable | Available |
| Auto silence trim | Unavailable | Available |
| Batch dictation review | Unavailable | Available |
| Import someone else's full segment archive | Rejected past the 180s cap once quota is used up | Full import, unlimited |
This comparison reflects the current iOS version; the Android version may differ once it launches. Features match Pro during the 7-day trial before purchase, and built-in practice material gets full shadow reading, workflow, and web dictation access even on the free tier.