AlgoApp (formerly Flashcard Hero) is one of the best pure SRS tools on iOS. It supports FSRS one of the most accurate spaced-repetition algorithms available along with AI card generation and cross-platform sync. The technical issues are real, but longtime users give it high marks for good reason.
評価点：The FSRS algorithm adapts the review schedule to your actual responses more precisely than Anki's classic SM-2. An AI assistant generates cards right inside the app. There's a huge library of pre-made decks to download.
不満点：Sync between devices is unreliable. CSV import doesn't auto-convert phonetic transcriptions. Cards inside downloaded community decks can't be edited.
向いている人：Serious language learners and exam preppers who want a top-tier repetition algorithm and the ability to build their own material.
AnkiMobile Flashcards is the mobile port of the legendary Anki SRS engine. The spaced-repetition algorithm is the best in the category: configurable retention, FSRS, proven over decades. It supports media cards, import/export via AnkiWeb, and thousands of community decks. The one significant weakness is the interface it feels archaic, doesn't follow iOS conventions, and has a steep learning curve. Complex card editing is desktop-only. One-time purchase of $25.
評価点：FSRS with configurable retention delivers a science-backed review schedule. Sync through AnkiWeb. Thousands of community decks for languages, medicine, law, and more.
不満点：The interface doesn't follow iOS patterns and still feels like a web wrapper. Complex card editing is only available on desktop. There's no obvious button to study an entire deck.
向いている人：Med students, linguists, law students, and anyone serious about long-term retention who is willing to spend an hour on setup to get the best algorithm available.
A vocabulary trainer built around film and TV clips with contextual examples not a classic SRS flashcard editor. Content is fixed (the app's own word database), so you can't create your own cards. It took a serious hit from several updates that wiped user progress and broke audio. AI-generated illustrations are frequently criticized for poor quality.
評価点：Vocabulary cards tied to real clips from movies and TV shows words stick because you remember the context. Deep enough content for advanced learners.
不満点：No way to add your own words or create custom cards. Multiple updates have wiped accumulated progress. AI images are off-topic. Audio breaks after updates. Development stagnating compared to competitors.
向いている人：English learners at B1-C1 who want to expand vocabulary through film context rather than building their own decks.
Brainscape is one of the few apps in this batch that genuinely implements spaced repetition with user-rated confidence. The method works, and the interface is cleaner than most competitors. The main limitations are around session control and text-to-speech.
評価点：A five-point confidence scale on every card directly drives review frequency this is honest SRS. Cross-platform: easy to create decks in the browser, easy to study on your phone.
不満点：You can't set a fixed number of cards per session. No text-to-speech. The algorithm sometimes resurfaces cards you just reviewed while ignoring ones you haven't answered.
向いている人：Students and self-learners with ready-made card sets or who want to build their own. Especially good for people who study on both phone and computer.
A narrow-purpose app for learning the Japanese syllabaries (hiragana and katakana). Not a general-purpose flashcard engine. Spaced repetition is advertised in the 'smart quiz' mode, but it's critically broken: the quiz ignores katakana and only shows hiragana, even on high streaks, instead of surfacing weak characters. Handwriting recognition is unreliable for katakana.
評価点：Minimal and free, works well for hiragana, clean interface without clutter, per-character progress tracking.
不満点：Smart quiz is broken for katakana the core feature doesn't work. Handwriting recognition is unreliable. No onboarding for new users. Saving custom character lists is buggy.
向いている人：Japanese beginners who only need to learn hiragana. For katakana, the app is effectively unusable based on current reviews.
