Leon Jakob Kastelic's profile on Product Hunt

About

Building Webflow tools at Flowout, the Webflow agency for B2B SaaS. Right now that means Awesome Popups: design a popup inside the Webflow Designer, add triggers - done. No code, and it doesn't look like a 2014 newsletter widget. Also growing Optibase, an A/B testing platform for Webflow teams who'd rather check than guess. What I actually spend my days on: -launching and growing SaaS products -content and distribution (Reddit, LinkedIn, X) -landing pages and funnels -figuring out why people click on things. Previously ran meme pages. Turns out that's the same job with fewer dashboards.

Links

Flowout LinkedIn

Flowout X

X (personal)

Badges

Bright Idea 💡

Gemologist

Tastemaker

Gone streaking 10

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Maker History

Awesome PopupsTurn any Webflow element into a popup.
Oct 2026
Optibase Everything you need to experiment. Nothing you don’t.
Apr 2026

🎉

Joined Product HuntMarch 10th, 2026

Forums

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25d ago

Awesome Popups - Turn any Webflow element into a popup.

Stop pasting popup widgets into sites you spent weeks designing. With Awesome Popups, you build the popup in the Webflow Designer, then add triggers (exit intent, scroll, time, click), targeting, frequency caps and multi-step flows. Built-in analytics show what actually converts. Works with Webflow forms, Zapier and webhooks.

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6mo ago

The Ultimate Blueprint to A/B Testing - Everything you need to drive revenue with A/B testing.

A free, comprehensive blueprint to A/B testing based on what we’ve learned from working with 3,000+ teams. Learn how to run A/B, split, and multivariate tests step by step, understand statistical significance, avoid common mistakes, and turn experiments into real revenue. No signup required, just practical insights you can apply immediately.

p/contral

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6mo ago

1 month since launch on ProductHunt

One month ago we launched Contral on Product Hunt and hit #1 Product of the Week. Here's what happened since.

500+ developers downloaded the beta. We didn't expect that number this early honestly. The feedback has been wild, some stuff we expected people to love (the teaching layer) and some stuff we didn't expect at all (Defense Mode became the most talked about feature by far, people genuinely love being quizzed on their own code which was surprising).

We started conversations with a few universities about running Contral as a pilot in their CS programs. The idea of students learning to code inside an actual IDE instead of switching between a tutorial and an editor resonated hard with the professors we spoke to. Nothing signed yet but the conversations are real and moving.

Bug reports have been humbling. Our early users don't hold back and thats exactly what we needed. We've shipped fixes almost daily since launch based on real user feedback. The product today is genuinely better than what we launched with a month ago.