PreTestAds is a self-serve ad pre-testing tool for marketers, agencies, and creators. Upload a video ad (up to 60 seconds) or a static image, and the AdCortex engagement model predicts second-by-second viewer attention, benchmarked against 76 top-performing ads curated from the TikTok Creative Center. Every analysis returns four actionable metrics: Hook Strength (whether your first 3 seconds stop the scroll), Attention Drop (the exact second viewers check out), Peak Moment (your best thumbnail frame), and Purchase Signal (engagement remaining during your CTA window). You also get an AI-ready report you can paste into Gemini for frame-level coaching. First analysis free, no credit card. Plans from $49/month. API access included.