GTIN data is a total mess depending on what you're selling. Fashion and apparel are basically ghost towns with 70-95% of GTINs just missing, while food and CPG stuff is a bit better but still losing 30-50% of the data. Now, if you actually want to build something that works, you're looking at systems that pull off an F1 score around 0.92-0.96 when you throw multimodal AI and human eyes at it together, though you'll probably still get 4-7% false positives that slip through. But if you go the SaaS route, you're dropping 50k-500k a year and waiting 2-8 weeks to go live, whereas building your own pipeline will cost you 300k-1M upfront but pays for itself in 18-30 months if you've got over a million SKUs to manage. To actually make this useful, you'd want a breakdown of GTIN coverage by category, workflows that route matches based on confidence scores, and a simple build-vs-buy comparison that teams can actually use when they're trying to figure out if this investment makes sense for their operation