lull turns the core idea of comprehensible input into a single, eyes-free loop. Here is exactly what happens, from your first minute to your hundredth story.
A quick self-rating and a short comprehension probe estimate your starting level - no long placement test, no fake precision.
Press play. A short story unfolds in your target language, built from words you know plus a few new ones, at your exact level.
Hear a word you don't know? Tap once, anywhere. Eyes closed, on a walk, in the car - one gesture, no menus.
lull attributes the tap to the right word, marks it for spaced review, and tunes the next story's difficulty to how you're doing.
Due words come back woven into new stories and as quick flashcards graded by a spaced-repetition engine, so they actually stick.
You give a quick self-rating and answer a short comprehension probe - a handful of real sentences spanning common to rare vocabulary. From that, lull estimates a starting level. It deliberately won't claim a precise word count it can't back up; the level is a starting point that keeps refining as you listen.
Each segment is freshly written from your own known words, a few new ones, and any words due for review. A trusted validator checks every script against your vocabulary and repairs anything out of set, so the story lands just above your level - the 'i+1' of comprehensible input.
While you listen, the whole screen is one tap target. Tap when you hear a word you don't know. lull attributes the tap to the word you most likely meant - accounting for the split-second reaction lag - then marks it and schedules it. No menus, no typing, eyes free.
Tapped words go into a real spaced-repetition engine (FSRS). They come back two ways: woven into future stories as natural exposure, and as quick review cards you grade Again / Hard / Good / Easy when you have a moment to look. You never build or manage a deck.
Pick a genre - travel, food, sci-fi, daily life, news - and your stories lean that way. The topic changes the scene, never the vocabulary ceiling: the words stay exactly at your level.
Point lull at a YouTube video, or paste lyrics or a transcript. It works out which words are new for you, pre-teaches them with short warm-up stories, then plays the real thing - so you learn toward the things you actually care about.
Languages you already speak make the next one easier. If you're a Spanish speaker learning Brazilian Portuguese, lull pre-seeds the large shared and cognate vocabulary up front (verified by your taps), so you start high and only drill the genuinely different words.
Calibrate in about a minute and hear your first story at your level.
Start listening