Whitespace.
See who already built your idea — and the space they left open.

CLUSTER LEARNING-REPETITION-SPACED · 28 ENTRIES · EARLIEST ENTRY 2026-08-11

Spaced repetition vocabulary apps

This cluster comprises web apps for learning vocabulary through spaced repetition, with users adding words and reviewing them on a schedule. Entries are sporadic from May 2021, with a denser stretch in early-to-mid 2026, though the overall dated history is limited. On traction, wordbook-worker leads with 1 star, while lingo-fox and vocab-loop each have 0 stars.

Entry timeline

ENTRY TIMELINE

MAY 2021: 1DEC 2023: 1APR 2025: 1JUL 2025: 1JAN 2026: 1APR 2026: 1JUL 2026: 1AUG 2026: 6SEP 2026: 11OCT 2026: 4
MAY 2021OCT 2026

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 1 ai-built · 2 hand-coded · 17 unlabelled

Operator · 15 hobby · 2 open source · 3 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 20 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01lexi3★2 days—hobbyLocal-first English vocabulary manager and learning tool for Windows and Android that uses spaced repetition to help users memorize words.
  2. 02WordsMem1★1 day—hobbySelf-hosted web app that trains Chinese and English vocabulary using spaced repetition and supports importing word lists from files.
  3. 03lexicon-vocabulary0★20 dayslivehobbySpaced-repetition vocabulary learning web app that helps users memorize words through scheduled review sessions.
  4. 04lingo-fox0★27 dayslivehobbyWeb app that helps language learners save new words and review them through five spaced-repetition stages.
  5. 05vocab-de0★13 days—hobbyBrowser-based German vocabulary trainer with spaced-repetition scheduling, article drills, offline study, and optional self-hosted sync.
  6. 06flashcode0★16 days—hobbyWeb app that provides active-recall C++ coding drills with a test harness and spaced repetition to schedule reviews.
  7. 07banchinhthuc0★10 days—Vocabulary and grammar learning app that uses spaced repetition to schedule reviews and offers AI-generated example contexts.
  8. 08english-daily-app0★19 days—hobbyDaily English learning web app that teaches vocabulary and grammar through quizzes with spaced repetition and offline progress tracking.
  9. 09dq0★16 days—hobbySpaced-repetition web application for memorizing English-Chinese vocabulary using an open dictionary and scheduled review tasks.
  10. 10AudioLex0★1 moliveopen sourceOffline hearing-training app that plays spoken words, adds adjustable background noise, and uses spaced repetition to rebuild word recognition.
  11. 11english-memory0★5 days—hobbyWindows app that supports English listening and vocabulary learning with spaced-repetition review.
  12. 12vocallearn0★17 days—hobbyVoice-first spaced repetition app that teaches short lessons and scores spoken recall with an AI tutor.
  13. 13vocab-loop0★1 molivehobbyWeb app for learning English vocabulary through spaced repetition, letting users add words and review them daily.
  14. 14english-1750-trigger-Public0★1 molivehobbyInstallable vocabulary trainer that schedules spaced review of a 1,750-word business English list and sends push reminders when reviews are due.
  15. 15studyBuddy0★1 molivehand-codedhobbyOffline-first study web app that parses natural-language task entries and schedules spaced-repetition reviews for students.
  16. 16my-revision-app0★1 mo—Desktop app for spaced repetition revision with scheduled reviews at one, seven, and sixty days.
  17. 17estrato0★27 days—ai-builthobbyAdaptive study platform that plans daily review sessions for public-service exam preparation using spaced repetition.
  18. 18word-cards-pwa0★26 days—hobbyWeb app for learning vocabulary with spaced-repetition flashcards, storing progress locally and working offline.
  19. 19lexisle0★1 mo—Responsive web app for learning vocabulary through reading articles with translation and spaced repetition.
  20. 20Parley0★3 molivehand-codedopen sourceVocabulary trainer that uses spaced repetition and multiple training modes to help users memorize words in a foreign language.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.