Google Sign-In Fails Inside TikTok's Browser, Leaving Ad Visitors Without Signups

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A developer running OutfitMaker, an AI outfit planner, spent 21 euros on a TikTok ad that drew 93 visits but produced zero signups, while the site overall converted about one visitor in five. The developer traced the gap to the sign-up page's first button, "Continue with Google", which fails inside embedded in-app webviews such as TikTok's with a 403 disallowed_useragent error. Visitors who hit that error likely left before trying the working email form below it. The developer shipped a fix the same day: a User-Agent-based module that detects in-app browsers from TikTok, Instagram, Facebook, Snapchat, and LinkedIn. The developer acknowledges that User-Agent detection is fragile but notes that its failure modes are mild, since a missed detection just shows the old page.

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