Launching today
The 9:16 Retention Engine
Turn blank prompts into high-retention 9:16 AI video loops
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Turn blank prompts into high-retention 9:16 AI video loops
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A plug-and-play AI video prompt vault and editing blueprint built specifically for 9:16 vertical short-form video (YouTube Shorts, Reels, TikTok). Includes tested prompts across ASMR physics, miniature worlds, and expressive objects—plus center-safe vertical framing rules, seamless loop-bridging cuts, and a 3-layer audio mixing stack to push average percentage viewed past 100%.
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Render Sandboxes: a computer for every agentIsolated compute, persistent state and a real filesystem
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Hey Product Hunt! 👋
I built The 9:16 Retention Engine after spending months generating and testing vertical AI videos for YouTube Shorts.
The problem I kept running into: Most AI video prompts online are written for 16:9 cinema or static art. When you generate them in 9:16, the action happens too slowly in the first 0.5 seconds, platform UI buttons cover the main subject, or awkward generator watermarks ruin the corners—causing viewers to swipe away immediately.
What’s inside this playbook:
9:16 Safe-Zone & Clean-Canvas Framing: How to prompt subjects into the center 60% vertical column and frame edges for clean 1080×1920 crops.
4 High-Retention Prompt Categories: Copy-paste prompts engineered for Sora, Runway Gen-3, Kling, Luma, and Veo (Hyper-Tactile ASMR Physics, Miniature Worlds, Expressive Everyday Objects, and Seamless Transformations).
The 3-Minute Post-Production Stack: How to trim the first 0.3s "AI ease-in" lag, match end-to-start frames for infinite loops, and layer foley + sub-bass audio (-28 dB / -6 dB / -12 dB).
I included an exclusive 35% launch discount for the Product Hunt community using code PHLAUNCH at checkout.
I’d love your feedback: Which AI video generator (Kling, Runway, Sora, Veo, or Luma) are you currently getting the best vertical motion physics from—and what niche are you testing right now?