100LS turns podcasts and audio content into your personal classroom. Practice sentence by sentence, repeat until it sticks, and build fluency that lasts.
We believe fluency is built through deliberate, focused repetition — not passive exposure. 100LS gives you the tools to practice with intention.
Browse curated podcasts or import any audio — your own recordings, YouTube videos, language learning materials. All content becomes structured learning material.
Subtitles load instantly from our cloud. For your own imports, on-device AI transcribes audio automatically. Bilingual display helps you understand every line.
Set repeat counts per subtitle line. Pause after each one. Shadow native speakers. Practice the sentences that matter — at your own pace and comfort.
Save standout lines to Favorites with personal notes. Go back to any saved sentence and jump directly to the source. Your study library grows with you.
Every control in 100LS exists for a reason. No clutter. No noise. Just the tools you need to practice well.
Slow down to catch every word. Speed up as you improve. Fine-tune from 0.5× to 2×.
See English subtitles alongside your native language. On-device Apple Translation — fully private, no internet required.
Merge or split subtitle lines so practice units feel natural. You decide how to break content down.
Local audio files, podcast RSS feeds, direct URLs. Anything can become a lesson.
One tap to save any subtitle line as a Favorite. Add notes. Review later. Plus subscribers get AI explanations for saved lines.
Streak tracking, total listening time, weekly activity charts. See your progress build over days and weeks.
Pick up exactly where you left off on any device. Favorites, progress, and personal subtitles stay in sync.
"Fluency isn't learned from textbooks. It's built by encountering the same language, in real context, over and over again — until it becomes part of you."
The 100LS method
The core learning experience is free. 100LS Plus removes limits and adds the tools serious learners need.
Download free on the App Store. The core learning experience is free — upgrade to Plus whenever you're ready.
Download on the App StoreFree to download · iOS 17+