New vs Due Cards: What's the Difference, and Which Do You Study First?
New and Due look like two random buttons the first time you open a spaced repetition app. Here's what they actually mean, and the honest, deck-by-deck way I decide which to do first.
The first time I opened a spaced repetition app, I sat there staring at two buttons — New and Due — and genuinely didn't know what to do with either of them. Nobody explains this part when they're telling you spaced repetition is better than cramming.
So here's the main point up front, then the reasoning behind it: do your due cards before your new cards, but not in whatever order the app happens to show them — do the due cards for the class you actually care about right now first. Skipping a new card costs you nothing. Skipping a due card costs you a little bit of forgetting, and it's your call which deck that risk is worth taking on.
The rest of this is how I actually apply that day to day, including the parts that don't fit neatly into a rule.
What "new" and "due" actually mean
New cards are the ones you made and haven't reviewed yet. The app has zero information on them — they just sit there until you study them for the first time.
Due cards are ones you've already rated yourself on at least once. The algorithm used that rating to estimate when you're about to forget the card, and today is that day — that's why it's showing back up now instead of tomorrow or next week.
That's the whole distinction: New = never seen. Due = seen before, and today's the day the algorithm wants you back for it. If you want the deeper mechanics of how that date gets calculated, I covered that separately in what FSRS actually does — this post is just about which one to study, and when.
Due before new, but by deck, not by default order
If I open the app and I've got due cards sitting in four different decks, I'm not clearing them in whatever order they happen to load in. I do the due cards for the class I actually have a test coming up in first, before I touch the due cards for some side deck I'm doing for fun. The app doesn't know which of your classes has a midterm in eleven days. You do — so that's what should decide the order, not the queue.
If I've genuinely got the time for it, I just do all of it — every due card, across every deck, no need to overthink the order beyond that. The prioritizing only matters when time is tight and something has to give.
When I'm cramming one specific deck
If I've got a deck I'm really leaning on — a class with an exam coming up fast — I don't just clear its due cards once and move on. I review it, then review it again, more than the schedule technically calls for, so I'm seeing that material more often than the algorithm's normal interval would give me. That's effectively me forcing a shorter review gap for that one deck because I need the retention now, not in five days.
While I'm doing that, I'm not adding new cards to that same deck. It's not the moment for it — I'm reinforcing what's already there, not expanding the pile on top of it. This is the same idea behind cramming vs spaced repetition: the two aren't opposites. Cramming a deck you've already been spacing out is just a different tool for exam week, not a betrayal of the method.
One practical thing to know if you do this: reviewing a card before its due date can mess with your schedule in some apps, because the algorithm reads "you reviewed it" as new information about how well you know it. Nebulearn's default review scope only updates the schedule for cards that are actually due — so extra review on a not-yet-due card doesn't distort your long-term intervals. Worth checking whether your own tool works the same way before you go cram-review a deck a bunch.
Adding new cards just because it's more interesting
Not everything I do is calculated. Sometimes I add new cards to a deck not because I ran the numbers on my due pile, but because doing review after review after review gets stale, and a few new cards make the session feel like progress instead of a chore. That's a real reason people do things, even if it's not the most "optimized" one — studying doesn't have to be a fully optimized system to actually work.
The one thing worth knowing: new cards aren't free. Every card you add today becomes a due card in a few days, then again later, and if you keep adding faster than you clear what they create, that pile compounds. The commonly cited Anki number is that a steady 20 new cards a day tends to settle into something like 200 reviews a day once it's running. That's not a reason to avoid new cards — it's a reason to notice if your due count keeps climbing and never comes back down. That's the actual signal to slow down, more than any fixed daily limit. And if you're wondering where new cards should even come from, making cards from your actual lecture notes beats making them from a whole textbook chapter at once — smaller batches mean a smaller due pile later.
| New | Due | |
|---|---|---|
| What it means | Never reviewed | Reviewed before, scheduled again |
| Cost of skipping today | None — it just waits | A little forgetting, more relearning later |
| Priority | Deck-dependent, your call | Usually first, unless a specific deck needs more |
Quick answers to the questions people actually ask
Does skipping due cards actually hurt me, or is that overblown? It's real, but not catastrophic — missing one day won't ruin a deck. It's the pattern that gets you: due cards you keep pushing off get harder to answer correctly when you finally do them, which usually means more reviews later to re-stabilize them, not fewer. The cost isn't today. It's future-you, but worse.
Is it ever fine to just do new cards and skip due? Rarely — mainly if you're previewing material before a lecture and don't have review history built up yet, so there's nothing due to skip. Outside that, I wouldn't make it a habit. New cards feel like progress because they're novel, but due cards are what's actually keeping older material alive in your head.
How many new cards a day is "normal"? There's no universal number — it depends on your class load and how dense the material is. If you're not sure, start around 10 to 15 a day and watch what happens to your due count over the next week. That tells you more than any fixed number from a forum post.
The short version
Due before new by default. Priority by deck when something's actually urgent — the class you care about beats whatever order the app shows you. Extra review, not new cards, for whatever you're cramming. New cards added in normal batches the rest of the time, partly for progress, partly because a little variety keeps the app from feeling like a chore to open. None of that is a rigid formula — it's just what's actually worked for me, day to day, across a few years of doing this.