Explain concepts aloud. AI asks follow-up questions to probe your understanding. Spaced repetition locks it in.
Free beta access + early-bird pricing
Explain this concept in your own words.
“L1 regularization adds a penalty to the loss function based on the absolute value of the model weights. This pushes some weights to exactly zero, effectively selecting the most important features.”
AI Follow-up
Good explanation! Now tell me — why does L1 push weights to exactly zero, while L2 only shrinks them?
Explain the concept → AI probes your understanding → Spaced repetition reviews
Seeing the right answer and being able to explain it are completely different skills.
Traditional tools can't tell if you actually understand or just memorized the words.
Reading definitions doesn't build the neural pathways that active production does.
Without spaced repetition tied to real comprehension, you forget 80% within a week.
Same active learning method — whether you're preparing for an exam, mastering technical concepts, or building professional vocabulary.
Swipe to see more →
You said:
"Social cohesion refers to the bonds that hold a community together — shared values, trust, and a sense of belonging."
AI Follow-up:
"Good. How does income inequality affect social cohesion?"
Understanding: 7/10You said:
"It's an optimization algorithm that iteratively adjusts parameters by moving in the direction of steepest loss decrease."
AI Follow-up:
"Why might gradient descent get stuck in a local minimum?"
Understanding: 8/10You said:
"Homeostasis is the body's ability to maintain stable internal conditions like temperature and pH despite external changes."
AI Follow-up:
"What role does negative feedback play in homeostasis?"
Understanding: 7/10You said:
"STAR stands for Situation, Task, Action, Result — a framework for structuring behavioral interview answers."
AI Follow-up:
"Walk me through a specific example using the STAR method."
Understanding: 6/10From your study deck or one of our curated topic packs.
Speak your understanding — no multiple choice, no shortcuts.
Probes gaps in your reasoning to test real comprehension.
Weak concepts come back more often. Strong ones fade out.
The AI doesn't just check — it probes. Follow-ups reveal gaps you didn't know you had.
Explaining out loud builds stronger neural pathways than passive review ever could.
Concepts you struggle with appear more often. Ones you master fade away.
Languages, exams, medicine, engineering, interview prep — one tool for everything.
10 minutes a day. No scheduling. No tutors. Just you and the AI.
See comprehension deepen over time — not just cards flipped.
The core system is domain-agnostic. Target what matters to you.
IELTS, TOEFL, Cambridge — explain vocabulary like the exam demands.
Machine learning, algorithms, systems design — prove you understand, not just recall.
Anatomy, pharmacology, diagnostics — explain mechanisms, not just labels.
Behavioral and technical — articulate your thinking clearly under pressure.
CFA, PMP, AWS — actively explain frameworks instead of drilling multiple choice.
History, philosophy, science — build deep understanding for essays and exams.
Daily practice
Better retention
AI tutor available
“The follow-up questions are what make this different. I thought I understood regularization until the AI asked me to explain why L1 produces sparsity. Humbling and effective.”
Alex R.
ML Engineer
“I used flashcards for months preparing for IELTS. This is the first tool that makes me actually speak and think. My examiner said my coherence improved dramatically.”
Maria K.
IELTS Candidate
Stop flipping cards. Start building real understanding — 10 minutes a day.
+ Early-bird pricing at launch
Instant access in the app.
Flashcards test recognition — you see a prompt and pick the answer. VoiceVocab tests production — you explain concepts aloud and the AI asks follow-up questions to verify real understanding.
Anything you want to learn. Language exams, technical concepts, medical terminology, interview prep, professional certifications. You can also create custom decks.
The AI assesses comprehension depth, accuracy, and completeness. Then it asks targeted follow-up questions to probe areas where your understanding may be shallow.
Speaking is the default and recommended mode — explaining aloud forces deeper processing. But typing is also supported if you prefer.
Any modern browser (Chrome, Firefox, Safari, Edge) on desktop or mobile. Just need a microphone for voice mode.
10–15 minutes daily. Consistency beats marathon sessions. The spaced repetition algorithm handles the scheduling.
10 minutes a day. Explain concepts. Get follow-up questions. Build real knowledge.
Try the beta →Free during beta