Vibe coded a tool that fixes the Instagram/TikTok in-app browser conversion problem, $30 lifetime, 0 customers so far lol

Built this weekend-ish with Claude and a bit of swearing. The thing I learned: in-app browsers on Instagram, TikTok, and Facebook are conversion killers. When someone clicks your link inside those apps, they get a tiny sandboxed browser. Autofill is broken. Apple Pay does not work. Saved passwords are gone. The user just bounces because buying anything takes 4 extra steps.

I kept reading about this problem in e-commerce forums and figured someone had to have built a clean fix. There were some janky JavaScript solutions. Nothing simple. So I vibe coded one. nullmark.tech wraps your link. When a user clicks it from inside Instagram or TikTok, they get a little prompt to open in their real browser. It takes 3 seconds. Conversion jumps. Claude wrote maybe 70% of it, I steered and fixed the parts it hallucinated.

What I learned building this:

The browser detection for in-app vs real is actually not that clean. Facebook's browser UA string is its own chaos.

The UX of the "open in browser" prompt matters a lot. Too aggressive = user closes it. Too subtle = user misses it.

Currently at 0 customers. Just launched. If you run any kind of social media traffic to a landing page, this might be the most boring useful thing you add today. nullmark.tech

$30 lifetime is enough to test whether anyone actually wants this. If I get 10 customers I will know it is real.