What “best” should mean in 2026
The best spaced-repetition tool is the one that still has a streak of opens in week six. Algorithm debates (FSRS vs SM-2) matter after consistency exists — not before. For a wider look at iPhone study stacks, see our best study apps for iPhone in 2026 roundup and the Studying & Memory guide hub.
Head-to-head snapshot
| Tool | Model | Algorithm notes | Best for | Watch-outs |
|---|---|---|---|---|
| Anki | Flashcards | SM-2 / FSRS | High-volume mastery | Setup cost, iOS price, backlog |
| Quizlet | Flashcards + modes | Proprietary Learn | Shared decks, casual study | Weaker long-term control |
| Brainscape | Confidence cards | Confidence-based | Simple UX | Less precision at huge scale |
| RemNote | Notes + cards | SRS in notes | Notes→cards workflows | Heavier all-in-one |
| Mochi | Markdown cards | SRS | Design-sensitive users | Smaller ecosystem |
| Revu | Calendar revision planner | Topic-level spaced intervals | Exam prep without card decks | Not a flashcard app; no shared decks |
Revu vs flashcard apps: an honest split
Revu is not an Anki clone — and that is the point. It is a calendar-based spaced-repetition revision planner: you schedule whole topics (e.g. “Organic Chemistry — Chapter 4”) on expanding intervals, attach notes, and get reminders when a review is due. There are no front/back cards, no deck imports, and no SM-2 or FSRS rating buttons.
Compared honestly:
- Anki / Mochi / RemNote win when you need granular fact recall, custom card types, or notes-to-cards pipelines. Revu will feel underpowered if your workflow is card-first.
- Quizlet / Brainscape win for shared class decks and quick quiz modes. Revu does not replace a social deck library.
- Revu wins when you already know what to revise, hate card maintenance, and want a calendar that tells you which chapter to reopen on Thursday — not which card to flip. See also spaced repetition without flashcards for the full philosophy.
Spacing on a calendar, not on cards
Revu schedules topic-level reviews with reminders and notes — ideal when exam season needs a revision plan, not a deck-building project.
View on App Store →FSRS vs SM-2 in one paragraph
SM-2 is the classic SuperMemo-derived schedule many apps inherited. FSRS is a newer model that uses more detailed review history to predict retention; Anki users often enable it for efficiency. Neither saves you if you never open the app.
Decision guide
- Medical/language fact mountains → Anki (or an Anki-compatible modern client).
- Class decks with friends → Quizlet first.
- Hate complexity → Brainscape or a planner.
- Multi-subject exam season without card time → revision planner (Revu’s lane).
The GeekFlux take
We care less about crowning a universal winner and more about matching the interface to the job. If flashcards are the job, pick a card app. If “revise Chapter 4 on Thursday before I forget” is the job, pick a planner.