Hey! Your feature list really resonates with me — I've been building something along these lines. Check out Read in Levels (readinlevels.com). Here's how it maps to what you described: Points 2 & 3 (real articles + comprehensible input): We take real-world news and rewrite each story into 5 CEFR levels (A1–C1). So the same article exists at your exact comfort zone — roughly 90% familiar, 10% new, which is right in the Krashen i+1 sweet spot. Point 1 (interest-based content): We publish 1 article daily across 8 categories — World, Science, Health, Tech, Business, Sport, Nature, Offbeat — so you can stick to topics you actually care about. Point 4 (word frequency): Each level's vocabulary is deliberately chosen with frequency in mind. A1/A2 sticks to the most common ~1000–2000 words; higher levels progressively introduce lower-frequency vocabulary. Reading + listening combined: Every article has audio narration, plus dictation and sentence recall exercises built in. What we don't yet have — and I'll be honest about this — is the long-term memory and spaced repetition you're most excited about (your Point 0 and 6). That's the hardest part to build well, and it's on our roadmap. The idea of weaving due SRS words into a generated reading passage rather than flashcards is genuinely novel, and I think it's the right direction. Would love your feedback if you give it a try!