Open datasets
Two small datasets behind the tools on this site. Both are licensed CC BY 4.0, so you can reuse them with attribution. Each one states its method and what it cannot tell you.
Flashcard review workload model outputs
Modelled daily flashcard review loads for eight new-card rates from 5 to 100 per day at 85%, 90% and 95% target retention, after 7, 30, 90, 180 and 365 days and at steady state.
Limits. Model outputs from a stated interval ladder, not observed learner data. Lapses are not modelled and real schedulers adapt intervals per card.
Download: CSV · Method: how it was produced · Version: 2026
Archived copies: Zenodo, DOI 10.5281/zenodo.23361866 · Hugging Face
Cite as: Fulin Labs, “Flashcard review workload model outputs,” 2026, Fulin Labs, https://fulinlabs.com/tools/flashcard-workload-calculator/.
Chinese text analysis reference benchmark
Eight original diagnostic Chinese passages with character counts, HSK 2012 cumulative coverage at levels 1–6, the screening level at a 90% threshold, and a SHA-256 for each passage.
Limits. Diagnostic examples, not a representative reading corpus, a proficiency test or evidence that a learner can comprehend a passage.
Download: CSV · JSON with full passages · Method: how it was produced · Version: 2026-10-01
Archived copies: Zenodo, DOI 10.5281/zenodo.23361940 · Hugging Face
Cite as: Fulin Labs Chinese Text Analyzer reference samples, Fulin Labs, https://fulinlabs.com/tools/chinese-text-analyzer/#reference-benchmark.
Embed the workload calculator
If you write about spaced repetition, you can put the working calculator in your article. Paste this where the calculator should appear. It runs entirely in the reader’s browser and needs no account or script from you. Please keep the attribution link.
<iframe src="https://fulinlabs.com/embed/flashcard-workload/" title="Flashcard workload calculator" width="100%" height="560" style="border:1px solid #d0d7de;border-radius:8px;max-width:640px" loading="lazy"></iframe>
<p>Calculator by <a href="https://fulinlabs.com/tools/flashcard-workload-calculator/">Fulin Labs</a>.</p>Preview and method: flashcard workload calculator.
Related reading
How hard is a Chinese text? explains the coverage method with the benchmark samples, and how many flashcards per day shows what the workload numbers mean in practice.
Found an error or want to cite something in a form not listed here? Write to hello@fulinlabs.com.