Every deck has its own statistics screen: the same kinds of numbers as your global statistics, narrowed to just that deck. This article covers what's on it and how it differs from the global tier described in Global statistics.
Note
Deck statistics require flangu Pro. Free accounts only see the global Stats tab.
Opening a deck's statistics
Two places open this screen:
- From a deck's detail screen, tap
Statistics. - From the Decks tab, tap the small chart icon on any deck row.
Both are marked with a Pro badge and open the same screen.
At a glance
Three numbers sit at the top: Total Cards, Avg Reviews/Day, and Avg Interval.
Avg Reviews/Day is your review count for this deck divided by the number of days you've actually reviewed it, not by every calendar day since creation.
Avg Interval is the average scheduled gap between reviews, for this deck's cards that have graduated to the Review state. It's the same metric described in Global statistics, just scoped to one deck instead of all of them.
Deck identity
A card below the overview shows three dates: Created, Last review, and Next review.
Next review is the single earliest upcoming review date across every card in the deck. It's a different thing from the due forecast chart further down the screen, which spreads that same information across the next 7 to 30 days. If a card is overdue, Next review still shows a date in the past rather than "today," since it's reporting the earliest scheduled date, not adjusting for lateness.
Below the dates, Cards by Language lists each language this deck touches, with a count for each. A card contributes to both its front and back language, same as at the global tier.
Review quality
The Review Quality card is identical to the one on your global statistics screen: an Again/Hard/Good/Easy donut, a Standard/True toggle, and the resulting retention percentage, all scoped to this deck's reviews.
What Standard and True retention actually mean is covered in full in Retention explained. This screen doesn't redefine them, just narrows them to one deck.
Card progress
The Card Progress bar shows the same New, Learning, Relearning, Young, and Mature breakdown as the global tier, counting only this deck's cards. See Card states for what each state means.
Due & forecast
The Due & Forecast chart works exactly like its global counterpart: a bar per upcoming day, a 7/14/30-day toggle, and an overdue badge when this deck has cards waiting. See Activity, streaks, and forecast for how the forecast is built and what "overdue" folds into. Here, it only counts cards from this deck.
Study time
Study Time shows two numbers: total time spent reviewing this deck's cards, and your average time per review within it. There's no 7-day bar chart at the deck level; that breakdown only appears globally.
Growth & behaviour
The Cards Growth card shows how many cards you've added to this deck since it was created: a current count, the total growth over that period, and that growth as a percentage, alongside the date range it covers.
This is a simpler view than the global vocabulary growth chart described in Activity, streaks, and forecast, which plots growth as a line over time. Here it's a single before-and-after comparison, not a day-by-day chart.
Retention targets vs. retention shown here
The retention percentages on this screen are what you've actually achieved, not the deck's target. Target retention is a setting you choose in Deck settings; this screen shows the result of your reviews, which can sit above or below that target.
What's not here
Deck statistics don't include a Session Behaviour section. Average session length, biggest session, and total session count are only tracked at the global tier, since a "session" isn't scoped to a single deck.
Deleting a card or the deck itself doesn't erase the reviews already counted here; see Deleting a flashcard and Deleting a deck for what deletion does and doesn't affect.