Best Spaced Repetition Apps for iPhone: 2026 Comparison

Compare the review workflows

Start with one study task

Imagine studying cellular respiration. A flashcard might ask which molecule enters the Krebs cycle. A topic review might ask you to draw the pathway from memory, explain how the stages connect, then check the drawing against your course notes. Both can involve retrieval; they test different amounts of material at once.

Use cards when you want separate feedback on many small prompts. Use a topic tracker when your next action is a practice problem, a diagram or an explanation using resources you already have. Keep topics narrow enough that one difficulty rating is meaningful. If half a topic is easy and half is failing, split it.

AnkiMobile: consider it for a dedicated flashcard workflow

Anki’s official iPhone app is AnkiMobile. Its ecosystem includes desktop apps and AnkiWeb synchronization, and its documentation supports FSRS scheduling. It is a strong candidate when your study material already lives in decks or you want to build a reusable collection of individual questions.

Our practical tradeoff: a scheduler cannot repair an ambiguous question or an answer that is too long to judge. Before adding a large deck, check that its cards match your course and are useful to you. Follow the official Anki website to the iPhone app, since other apps use similar names.

• Official Anki apps and platforms
• Anki’s FSRS documentation

RemNote: consider it for notes and flashcards together

RemNote lets you create flashcards within notes and study on mobile. That makes it worth considering if you want the explanation and its retrieval prompts in the same workspace. Its mobile documentation also describes offline use and synchronization.

Our practical tradeoff: trying this workflow may mean changing how you write or organize notes. Test one lecture first. If you prefer keeping your existing note system and only need reminders to revisit it, a separate topic tracker may fit more easily.

• RemNote’s mobile app documentation

Brainscape: consider it for confidence-rated flashcards

Brainscape describes a Confidence-Based Repetition system: reveal the answer, rate how well you knew it from 1 to 5, and use that feedback to prioritize future card practice. Consider it if that style of self-assessment fits how you like to study.

Our practical tradeoff: familiarity with the answer can feel like knowing it. Say or write your answer before revealing the card, then rate that attempt. Check whether the content and features you need are included in the current plan before committing.

• How Brainscape describes its study system

Spaced Repetition Tracker: consider it for topic reviews

Our iPhone app organizes subjects, groups and topics. You study using your notes, textbooks or practice questions, then log a session and rate its difficulty. Choose an SM-2 smart schedule, fixed intervals or a preset plan. Reminders, widgets and calendar integration help you return to due topics.

The tradeoff is deliberate: this is a topic review tracker, without a flashcard editor or Anki deck import. You define what a successful recall attempt looks like. It can sit beside a flashcard app when you need both small factual prompts and broader problem-solving practice.

• How to use the topic review workflow
• An Anki alternative without flashcards

Should you choose by FSRS versus SM-2?

The algorithm matters, but first check what it schedules. A due card and a due topic are different units of work. Anki offers FSRS, which can fit parameters to review history and lets you set desired retention. Spaced Repetition Tracker uses SM-2 for its smart topic schedule; it does not offer FSRS.

A scheduling label alone does not establish that one app will improve your grades or save a particular number of hours. Compare the quality of your recall attempts, whether the workload is manageable, and whether the app supports the materials you actually use.

• Anki’s explanation of FSRS and retention settings
• How SM-2 topic scheduling works in our app

A small trial before you commit

Use the same narrow topic to evaluate your preferred workflow. This is a setup check, not a memory experiment or a claim that a few days can establish long-term effectiveness. Check current App Store prices and subscription terms in your region; this comparison does not maintain a price list.

1. Choose one topic and a clear recall task you can finish in a short session.
2. Set up only the cards or topic entries needed for that task.
3. Complete an unaided attempt, check your source and record the result honestly.
4. Return when prompted and note whether the setup makes it easier to start.
5. Keep the workflow you can sustain before adding more material.

Make a review plan for your own topics

Put the method into practice with our free spaced repetition schedule calculator. Enter your exam date and topics to get a daily review plan you can download to your calendar.

Research behind the method

Spacing and retrieval are well-studied learning principles, but no app or schedule guarantees a particular academic result. Use the research as a foundation, then adapt the workload to your material, deadline, and feedback.

• Distributed practice meta-analysis
• Retrieval practice and long-term retention

Frequently asked questions