100ls

100LS helps you train English listening with real podcasts, synced subtitles, sentence replay, and bilingual translation. No flashcards. No drills. Just real audio, one sentence at a time.

100 Days Language Study

Learn English through real podcasts. No flashcards, no drills.

Learn English the way you actually use it.

100LS is built for learners who are past the basics and ready to train their ear on real, unscripted English. Pick a podcast episode you're curious about, hit play, and let the content do the teaching.

Synchronized subtitles highlight word-for-word as audio plays. Tap any line to jump back and replay it. Toggle your native language translation on or off. Slow it down to catch every word, or speed it up to push your comprehension. Repeat until it clicks.

Features

Synced Subtitles
Every word lands on screen exactly when it's spoken. Tap any subtitle line to jump to that moment in the audio — no scrubbing, no guessing.

Native Language Translation
Powered by Apple's on-device translation engine. Works offline. Toggle translations on when you need context, off when you want the challenge.

Automatic Transcription
No subtitles for an episode? 100LS generates them automatically using on-device speech recognition, then syncs them to the cloud so they load instantly next time.

Variable Playback Speed
0.75x for close listening. 1x for natural pace. 1.25x–2x for review. One tap to cycle through.

Learning Analytics
Track your daily listening time and streaks. Small numbers add up — 20 minutes a day compounds fast.

Who it's for

You've studied English. You can read it fine. But listening to native speakers still feels like catching every third word. 100LS is for that gap — the one between knowing the language and actually hearing it.

Requirements
iOS 17.0 or later. Translation requires iOS 18.0 — language models download once on first use.

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