Why a 'Close After Memorizing' Vocabulary App Actually Retains Users

The Core Problem: Decision Fatigue, Not Memory

The biggest hurdle in vocabulary learning isn't forgetting words — it's not knowing what to review today. With a 3,000-word book at 12% progress, users face daily dilemmas: review yesterday's 30 words? Revisit the batch from two days ago? The 'daily task' mixes new and old words, forcing a manual triage every session. That judgment once is trivial; daily, it becomes exhausting. By day three, users stop opening the app entirely.

Algorithmic Scheduling: Ebbinghaus Intervals

The app applies spaced repetition via the Ebbinghaus forgetting curve, automatically scheduling each learned word at six fixed intervals: 1, 2, 4, 7, 15, and 30 days. Words appear only on their due date; nothing premature shows up. No planning, no progress tracking, no mental overhead. The session ends precisely when the due batch is exhausted — 'close after memorizing' is a scheduling outcome, not a minimalist aesthetic.

Four Question Types for Depth of Recall

Simple card flipping tests recognition of the card itself, not the word. To ensure genuine retention, reviews rotate among four modes:

New words: fixed flip-card introduction

Review words: random selection among flip-card, choose meaning given word, choose word given meaning, and spelling

Each mode probes a different memory strength: flip-card tests familiarity, choose meaning tests recognition, choose word tests recall, spelling tests production. A word is truly learned only when it passes all four.

Eliminating Guilt: The Hidden Retention Driver

The most striking user experience is seeing 'no words due today.' Because the algorithm has calculated the schedule, the absence is authoritative — not a failure, but a feature. This removes the guilt of 'not sticking to the plan,' which the article identifies as the covert cost that makes people quit earlier than memory failure does. When the system says today is clear, the user closes the app with zero burden.

Tool Philosophy: Use and Return

Good tools resemble a screwdriver: used, then returned to the drawer. The product 'Word Comes' exists solely to deliver today's due reviews — no streaks, no gamification, no engagement hooks. The session ends, the app closes, and the user moves on. Retention emerges from respecting the user's time and cognitive load, not from demanding it.