Brainscape's distinguishing idea is that you should tell it how well you knew a card, on a five-point scale. Heddy's is that when a card keeps beating you, you should be able to take it to a teacher. Both are real answers to the same problem.
At a glance
| Brainscape | Heddy | |
|---|---|---|
| Core idea | Confidence-Based Repetition, 1–5 | Three grades, then a tutor |
| Grading | Five-point self-rating | Again / Good / Easy |
| Interval shown before you grade | Not the headline feature | Yes, under each button |
| Deck sources | Curated + user-made library | Your own sessions + a curated Atlas |
| Who writes your cards | You, or someone else | The tutor who taught you |
| Tutoring | None | Eight tutors |
| Cost | Free tier; Pro subscription | Cards free and unlimited |
| Age / region | General | 13+, UK only |
| Best for | A learner who wants a fine-grained scheduler | A student who needs the card explained |
What Brainscape does well
The confidence scale is a genuinely thoughtful design. Most flashcard apps ask a binary question — did you get it? Brainscape asks a better one: how solidly did you get it? A card you answered correctly but hesitantly is meaningfully different from one you answered instantly, and Brainscape's scheduler knows that while a right/wrong system doesn't.
Its curated decks are noticeably better than a purely user-generated library. There's editorial effort in the certified content, and it shows against the free-for-all quality distribution of the biggest platforms.
The interface is calm and well made. Clean, quick, no gamified clutter — which for a student who finds most study apps noisy is worth real money.
It covers everything. Languages, professional exams, university subjects. Heddy covers seven school subjects, 13+, UK only.
Where we disagree, and why
On the five-point scale. More input to a scheduler is better if the input is accurate, and this is the part we don't think holds for a fourteen-year-old. The research on metacognition is fairly consistent that people are poor judges of their own recall strength — nobody reliably tells their own 60% from their own 75%. What a five-point scale does reliably add is a moment of deliberation about the rating, twenty times a session, spent on the buttons instead of the card.
So Heddy uses three, each labelled with the actual resulting interval so the decision is concrete rather than introspective. The reasoning in full. It's a genuine trade-off, and Brainscape has the better argument if you trust your own self-assessment.
On what happens when a card won't go in. This is the bigger difference and it isn't a matter of taste.
A confidence rating of 1, four times running, is excellent information for a scheduler and useless to the student. The card comes back sooner. It still isn't understood. No flashcard app can fix that, because a flashcard is a test and tests don't teach.
Heddy's answer is to put the teacher on the back of the card: after you mark one Again, you can carry that exact card to the professor who owns the subject, arriving with the front, the back, the hint and the misconception already sent. That handover is what the product is.
Where the cards come from
Brainscape gives you a library. Heddy mostly gives you cards from your own lessons — /cards at the end of a session, written by the professor who just watched you get something wrong, with your specific error recorded on the relevant cards.
A curated deck is about the subject. A card written after a session is about you. Heddy has a curated Atlas too, for day one, because an empty shelf is where flashcard habits die — but it's the starting point rather than the product.
Which to choose
Brainscape if you're a self-directed learner, you trust your own confidence judgements, you want a fine-grained scheduler, or your subject is one Heddy doesn't teach.
Heddy if the obstacle isn't scheduling — it's that some of these cards were never explained to you properly in the first place.
Comparison written 10 Sep 2026 from each product's public description. Features and pricing change — check the current App Store listing before deciding. Written by Duke Harewood, who builds the tutors at aitutors.me.