RYUN Engineering & Research
Blog & Engineering Notes
Things we built, measured, or got wrong. Written by the developer, dated, and updated in place when code or benchmarks change.
Articles (1)
#CEFR·8 min
CEFR Vocabulary Profiling: How to Measure Video Transcript Difficulty from A1 to C2
How frequency corpora and CEFR thresholds determine video difficulty. Learn how to profile subtitle transcripts in real time to find your comprehensible input zone (i+1) without outdated academic profilers.
Oct 27, 2026Read