Know your chapters.
Ten chapters per round. Recall, reveal, repeat.
Ten distinct chapters. One focused round.
Start with a chapter number and recall its topic, or reverse the direction. Reveal the answer, then rate how well you remembered it. The full USITC chapter title is shown under the short memory label.
Review just before you forget.
Rounds select the most overdue chapters first, then introduce unseen chapters in numerical order. The selected cards are shuffled. A round contains up to ten distinct chapters; if fewer are due or new, it is shorter. When everything is scheduled for later, optional practice does not change the review schedule.
- Again: review in 10 minutes; reset the successful-review count.
- Hard: first review in 1 day; later intervals grow by 1.2×.
- Good: first review in 1 day, second in 3 days, then multiply by your card’s ease factor.
- Easy: first review in 4 days; later intervals grow faster.
Hard lowers the ease factor, Easy raises it. Intervals are capped at one year. Due cards become available as time passes. The app remembers an unfinished round when you return.
Your data stays here.
Review history and the current round are stored locally in this browser. Other browsers and devices have separate progress. Export a backup to transfer progress; importing replaces the current progress.
Official titles, concise memory cues.
All chapter numbers 01–99 are included. Chapter 77 is reserved. Chapters 98 and 99 cover special provisions. Labels are 2–5 words and simplify the chapter scope; the official title remains visible for context.
Source: USITC HTS table of contents, fetched 10 October 2026. The live release API reported 2026 HTS Revision 21. Chapter titles are reproduced from the site’s table-of-contents data.