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Upload or pick audio
Import a podcast, video, or lesson. Chunk Box automatically splits it into meaningful sentences and phrases.
Chunk Box splits any English audio into meaningful chunks, then trains you to listen, shadow, record, and repeat until pronunciation, rhythm, and vocabulary stick.
No credit card required ยท Used by 10,000+ learners
โThe best way to sound natural is to copy natives one chunk at a time.โ
Turn any podcast, video, or lesson into a personalized speaking workout in under a minute.
Import a podcast, video, or lesson. Chunk Box automatically splits it into meaningful sentences and phrases.
Listen to each chunk, then record yourself repeating it. Compare your version with native audio side by side.
Mark vocabulary, take notes, and let spaced repetition bring weak chunks back until they stick.
Built for learners who are tired of passive apps and ready to actually speak.
AI splits audio at natural boundaries so you practice complete thoughts, not isolated words.
Record yourself after every chunk and compare waveforms with the native speaker.
Get instant, granular feedback on sounds, stress, and intonation.
Save tricky chunks, add context, and build your own searchable phrasebook.
Highlight new words, see definitions, and export them for spaced repetition.
Track listening time, recordings, accuracy trends, and streaks.
Chunk Box is built on four research pillars that explain why chunking, shadowing, and repetition work.
Repeated listening and speaking to the same material builds automaticity and fluency.
Read the deep dive โGraduated-interval recall and active participation mirror how children acquire language.
Read the deep dive โSmall daily drills, cues, and streaks turn practice into an automatic routine.
Read the deep dive โCommunity challenges and accountability multiply motivation and consistency.
Read the deep dive โMost apps let you consume English. Chunk Box makes you produce it.
| Capability | Passive apps | Chunk Box |
|---|---|---|
| Sentence-level chunking | โ | โ |
| Record-and-compare shadowing | โ | โ |
| Pronunciation scoring | Rare | โ |
| Bookmarks, notes, and exports | โ | โ |
| Research-backed methodology | โ | โ |
Chunk Box is built around sentence chunking and active shadowing rather than passive listening. Each audio is split into manageable chunks, and you record yourself repeating them to train pronunciation, rhythm, and memory.
Chunk Box offers a free tier with core chunking, shadowing, and recording features. Premium plans add advanced pronunciation analytics, unlimited uploads, and team collaboration.
Chunk Box combines four research pillars: the 100LS Method, Pimsleur's natural acquisition principles, habit formation science, and peer influence research.
Join thousands of learners who use Chunk Box to train listening, speaking, and pronunciation.
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