Frequently asked questions

What is this app for?

It turns material you are accountable for knowing into scheduled recall practice. You create a space for one subject, add the material as pasted text, an uploaded document or a web page, and the app generates cards from it and schedules them. Cards built from a source keep the exact passage they were drawn from, and that quote is checked against the source before the card ships. Practice happens in two modes: concept, where you explain something in your own words, and verbatim, where you reproduce a passage word-for-word. It suits certifications, degree modules, languages, speeches and internal documentation.

Does every card cite a source?

No, and the app says so on the card. There are two ways to make cards. If you supply material, the generated card stores the exact span it came from and that span is verified against the source before the card is accepted. If you instead describe a topic and let the app draft cards for it, there is no source document, so those cards are labelled as unsourced. That label is the honest part of the claim: the guarantee is not that every card cites a source, it is that a card which cannot cite one tells you.

How is a citation verified?

The cited span is validated as a literal substring of the ingested source chunk before the card is accepted. Exact string matching catches the common failure, which is a quote that was paraphrased or invented during generation. Cases that are ambiguous, for example where whitespace or formatting differs, escalate to an entailment check rather than being waved through. Stored spans are also re-checked against the live source over time, so a quote that no longer matches, because the document changed, is flagged as drifted on the card quality report instead of continuing to look trustworthy.

Which spaced repetition algorithm is used?

FSRS-6, the sixth version of the Free Spaced Repetition Scheduler, through the ts-fsrs package. FSRS models your individual forgetting curve per card and schedules the next review shortly before the point where you are predicted to forget it, rather than stepping through fixed intervals as SM-2 does. In practice that means a fixed daily time budget covers more material, and cards you find easy stop consuming review slots quickly. Each answer also records confidence and hesitation alongside correctness, which feeds the calibration signals rather than the schedule itself.

How does self-grading avoid cheating itself?

In concept mode you write your recall and commit it before anything is revealed. The model answer, rationale and anchor term are not in the page at all until you commit, so there is nothing to peek at. After committing, the app checks that the anchor term genuinely appears in what you wrote, and asks a short binary question about it. A blank or off-target answer cannot be marked correct. This matters because generous self-grading is the standard failure of self-directed spaced repetition: the schedule is only as good as the grades feeding it.

What does mastered mean?

Mastered requires three consecutive correct recalls, a retained interval of at least three weeks, and at least one answer given confidently. A single correct answer never counts as mastery, and neither does a run of correct answers at short intervals, because both are consistent with short-term familiarity rather than durable memory. The progress view reports mastery per topic rather than as a single headline number, so a subject where one topic is solid and another is untouched does not average into a misleading percentage.

What does it cost?

It is free during the beta period, with no card required to sign up. Paid tiers are planned, and the terms of service state plainly that accounts may need to move to a paid tier as costs become clear. What stays free after the beta has not been finalised, and the pricing page says that rather than implying unlimited free use indefinitely. Nothing you have already created is taken away when pricing changes; the change would affect what you can add next, and it would be announced before it took effect.

What happens to my material and my data?

Material you upload stays in your account and is used to generate and verify your cards. It is retained for internal analysis and product improvement, and it is never sold or licensed to a third party. Your study data, which cards you saw and how you graded them, drives the scheduling and the progress reporting. You can export your study state and delete your account from the account settings page. The privacy policy is the authoritative statement of all of this, and it is written to be read rather than skimmed.

Can I share a space with other people?

Yes. Spaces support owner, editor and viewer roles, and are shared through single-use invite links. A viewer can study the material and keeps their own progress; an editor can also add and change items. This is how a study group or a team can maintain one item bank rather than several overlapping ones. There is also a catalog of ready-made courses you can either join, keeping the shared content canonical, or fork into a copy you own and can edit freely.

Is there a limit on what I can study here?

Yes. The service refuses material that provides operational instruction for serious harm, including weapons manufacture, explosives, and other clearly illegal activity, along with sexual content. Legitimate professional and academic study of difficult subjects is not the target of those rules, and if your material is flagged incorrectly you can appeal it and a person will look at it. The acceptable use policy sets out the categories, and the enforcement is versioned, so the rule that blocked something is recorded rather than reconstructed after the fact.

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