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 (2)
#Nativra·9 min
FluentU Alternative: Why Video Language Immersion Does Not Need a $30/Month Paywall
FluentU locks curated video clips and interactive subtitles behind a $29.99 monthly paywall. Learn how Nativra provides a 100% free, zero-signup alternative that turns any authentic YouTube video into a language immersion lesson with dual synchronized subtitles and Anki export.
Oct 23, 2026Read
·8 min
Subconscious Subvocalization in Second-Language Reading: Why Text-Only Study Blocks Listening Speed
Reading foreign text without synchronized audio forces the brain into internal subvocalization capped at 80-110 words per minute, causing auditory buffer overflows during 180 wpm native speech. Here is how synchronized text illumination recalibrates speech perception.
Oct 17, 2026Read