A flashcard app for learning that lasts
Study quietly.
Remember everything.
JustFlip! is a spaced-repetition flashcard app for iPhone, iPad and Mac. Curate your decks on the desktop, review them on the go, and let an SM-2-inspired engine surface the right card at the right moment.
One library.
Three companions.
Capture and curate on the Mac. Review on the iPhone over morning coffee. Annotate on the iPad in the margins. iCloud keeps every card, every interval and every streak in perfect sync — without ever asking you to think about it.
Let the AI write the deck.
Two ways to create decks — full rich-content cards with agentic coding tools, or simple text-only sets directly in ChatGPT.
A library you can swipe through.
Browse decks as a calm, editorial list — or enter a focused review and judge each card with a Tinder-style swipe. Right for good, left for again, up for easy. The flow stays in your hand.
A patient algorithm.
Five states. Lasting recall.
JustFlip! runs a refined SM-2 engine across five learning states. Cards travel through unseen, learning, reviewing, relearning and graduated, each with its own interval and ease. Urgency tells you what is most worth your time today.
- UnseenNever studied — ready for first contact.
- LearningMinutes to a day. Fresh memory taking shape.
- ReviewingDays to weeks. The interval grows by ease.
- RelearningForgotten? Back to short intervals, gently.
- GraduatedWeeks to months. Long-term retention.
Ease grows on easy, settles on good, and contracts on hard or again — never below 1.3.
Not just flipping cards.
A proven way to remember.
Decades of memory research — popularized in the bestselling book Make It Stick: The Science of Successful Learning — point to one conclusion: we remember by retrieving, not rereading, and by spacing practice over time. JustFlip! turns that science into a daily habit.
Each review lifts recall and flattens the curve of forgetting.
Recalling beats rereading
Every card asks you to pull the answer from memory before you flip — that effort is what makes it stick.
Let a little forgetting work for you
Reviews return just as memory starts to fade, when each repetition does the most good — the SM-2 engine's quiet job.
Mix it up
Shuffling topics in one session feels harder — and builds memory that lasts far longer than studying in blocks.
A worthwhile struggle
Judging each card Again, Hard, Good or Easy keeps reviews honestly challenging — the kind of effort that deepens learning.
“Learning is deeper and more durable when it's effortful.”
— Make It Stick: The Science of Successful Learning
Cards that read like essays.
Define your cards in rich Markdown — headings, lists, code blocks, inline math, images and links. JustFlip! renders them with editorial typography so a card can be a one-line cue or a small piece of scholarship.
Decks that speak.
Let your cards read themselves out loud while you walk, cook, or drive. A Live Activity on your Lock Screen keeps the playback in sight — a small, golden invitation to five minutes of practice.
Your day, at a glance.
Open your Mac and JustFlip! greets you with today's review — what's due, what's new, and a single warm tap to begin. On iPhone and iPad, Lock Screen and Home Screen widgets keep your due count, your streak and your week's rhythm a glance away — so the next five minutes are never more than a look from where you already are.
Open to what matters
The Mac welcomes you with today's review — a daily amount that adapts to how much you actually learn — and starts the session in a single tap.
A glance before you unlock
Cards due and your running streak sit quietly on the Lock Screen, nudging you toward five honest minutes.
A week at a size that fits
A Home Screen widget charts your week, so progress stays in view between everything else you opened the phone for.
Dark by candlelight.
Light by morning.
JustFlip! respects the system. Switch from a deep, scholarly dark to a soft parchment light — the gold and slate stay true at any hour.
Learning, for every learner.
JustFlip! is built to work with the tools people rely on — so a deck is just as usable with a screen reader, at any text size, by ear, or in your own language.
VoiceOver ready
Navigate every deck with VoiceOver — cards, controls and each learning state are clearly labeled.
Cards that speak
Text-to-speech reads your cards aloud for eyes-free, low-vision and dyslexia-friendly study.
Dynamic Type
Respects your system text size, so cards and layout scale up without ever breaking.
Clear by design
The five learning states are set apart by label and position — never color alone — with a dedicated high-contrast mode in the works.
Speaks your language
The whole app — and this very page — is localized into nine languages.
English · Deutsch · Español · Français · Italiano · Português · 日本語 · 한국어 · Čeština
Available soon on Apple platforms
Bring JustFlip! to your shelf.
One purchase. Three platforms. A lifetime of well-spaced review.
Available in English, Deutsch, Español, Français, Italiano, Português (Brasil), 日本語, 한국어 & Čeština.