Comparison
Junbi.ai (from research firm eye square) and PreTestAds both promise the same headline — test your ad before you spend — with AI instead of panels. The real fork in the road is which feed your ads live in.
Junbi grew out of eye square's research practice and focuses on pre-flight testing for YouTube: predicted attention, brand recognition moments, and comparisons against YouTube ad norms. If YouTube pre-roll is your main battlefield, testing against that context with a tool built around it is a sensible default, and the research pedigree behind the benchmarks is real.
PreTestAds is built for the short-form, sound-on, vertical feed. AdCortex™ — trained on fMRI brain-response data — predicts second-by-second engagement and scores your ad as a percentile against 76 top-performing TikTok Creative Center ads. You get Hook Strength for the make-or-break opening seconds, the exact drop-off second, your peak frame, and a report designed to be pasted into an AI chatbot for coaching and regeneration. Skippable pre-roll and the TikTok feed punish different weaknesses; pick the benchmark that matches the punishment.
Both tools are faster and cheaper than panels. PreTestAds is aggressively self-serve — credits, up to 8 free to start, no procurement — and adds a pay-per-call x402 API so automated pipelines can score ads with no account or API key. If you're generating variations with AI tools and need to rank a batch before lunch, that workflow gap matters more than any single feature.
Choose Junbi if YouTube is your primary channel and YouTube norms are the comparison you need. Choose PreTestAds if you live on TikTok, Reels, and Shorts — or you want one fast brain-engagement screen across video and static creative with a percentile score you can act on the same hour. Multi-channel teams can honestly justify testing hero creative in both.
Score your ad against 76 top-performing TikTok ads — up to 8 free credits.
Test Your Ad FreeYes, especially for short-form vertical video. PreTestAds scores second-by-second brain engagement with an fMRI-trained model against 76 top TikTok ads, self-serve with up to 8 free credits. Junbi remains a strong choice when YouTube pre-roll norms are the benchmark you need.
The benchmark and the model. Junbi tests primarily against YouTube ad norms with eye square's research methods. PreTestAds uses an fMRI-trained brain-engagement model benchmarked against top-performing TikTok Creative Center ads — built for the vertical feed.
You should — the two feeds punish different weaknesses. A skippable pre-roll needs to survive the skip button at second five; a TikTok ad needs to stop the scroll in the first frame. Test each cut against the context it will actually run in.