How it works
Learn from what you don’t know
Save phrases you couldn’t say or didn’t understand. Review them before you forget. Listen until they feel natural.
Lacuna means gap — an app to help you find the gaps in your knowledge.
84+ languages — and no, you don’t have to pay for Pro to get fluent in one of them.
How it works
Capture. Study. Listen.
Translate and save what you needed, review before you forget, then listen to your own cards.
Step 1
Capture
You needed
How do I say ?
¿Cómo se dice…? → saved
Type a phrase you couldn’t say or didn’t get, then save it.
Step 2
Study
Due today
How are you?
Tap → ¿Cómo estás?
Review when it’s due — before you forget.
Step 3
Listen
Gracias · Thank you
Your cards, out loud
Hear your phrases until they feel easy to say.
New gap in life → capture again. The cycle keeps going.
Levels
Levels track words you still remember and out-of-app practice. They’re a guide, not a certificate.
Building
Saved, still settling.
Known
Still recallable after about three weeks.
Each level needs enough known words and out-of-app practice. That practice is required from Level 2.
Names roughly follow CEFR. They don’t replace real practice with people and media.
Lacuna helps with the phrases you bring. Real life does the rest.