Runway is, deservedly, the most-praised AI video tool of the last two years. Their model series, their professional editor, their ecosystem — none of it is fluff. ZSky AI is a newer, free, unlimited alternative. This post is mostly about pricing, because that's where the comparison gets interesting. The quality conversation matters too and I'll get to it. But for daily-generation use cases, the cost math is brutal in one direction. The Snapshot ZSky AI Runway Cost (free tier) Free, unlimited Limited credits, then paywall Cost (entry paid) $19/mo $15/mo (Standard) Cost (heavy use) $79/mo (Max plan) $35–$95/mo + per-credit overages Credit system None on free Yes (credits per generation) Editor Basic Professional NLE Model lineup Curated Multiple (Gen-3 Alpha, etc.) Image-to-video Yes Yes Text-to-video Yes Yes Green-screen / rotoscope Limited Yes (industry-grade) Where Runway Wins (Be Honest) Runway is genuinely excellent at a lot of things. Anyone telling you otherwise is wrong. Professional editor.…