Aleksandr Heinlaid

UI Builder + Mockup tool - Sketch UI mockups directly on live websites in Chrome

UI Builder is a Chrome extension for quick, sketch-style wireframes directly in your browser. Drag buttons, inputs, headers onto any page or blank canvas. Perfect for fast feedback, live demos, and client calls.

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Aleksandr Heinlaid

Hey Product Hunt! Write it from my heart - without AI :)

I’m an IT analyst, and the idea for UI Builder came during one of those classic Zoom calls with a client while discussing design changes in a CRM system.

I realized how tricky it can be to quickly show what a new button or checkbox might look like - right there, in the browser.
Sometimes I used screen drawing tools (not bad, but clunky), or I’d just sketch something later and send it for review after the call.

But being able to test and agree on a rough idea live, during the conversation - really speeds things up.

So I built this:
➤ Drag and drop UI elements onto any webpage or blank canvas
➤ Edit text in place, resize blocks, rearrange things
➤ Take screenshots or copy to clipboard
➤ Works locally, no data tracking, no login

I searched around and couldn’t really find a Chrome extension that does this - most are just drawing tools or annotation overlays.

Have you seen a tool like this before? Would love your thoughts or similar examples you’ve used.

Nika

Until now, I haven't seen such a versatile plugin here. Wish you good luck, guys! :)

Lembit Hunt

@busmark_w_nika Thanks a lot! We tried to keep it both simple and flexible.

Pranay Bansal
Launching soon!

Congratulations on the launch Aleksandr!

I find this idea very clever. People in my team have struggled with the same problem of sketching UI ideas after meetings. Your drag and drop approach seems a great fit.

Any plans for adding collaboration features for teams?

Aleksandr Heinlaid

@pranay12 Thanks so much! Glad to hear it resonates with your team - that’s exactly the kind of workflow we built it for.

Collaboration features aren’t available yet, but they’re definitely on the roadmap.

Lembit Hunt

@pranay12 Appreciate the kind words! Collaborative use cases are definitely something we want to explore soon.

Hugo Rosensköld Stengert

Wow, this is super handy! I’ve spent way too much time alt-tabbing to a design app mid-call or sketching on paper. Can’t wait to try it. Love that there’s no login required. Any chance of adding custom component libraries down the road?

Aleksandr Heinlaid

@hugors00 Thanks so much! Really glad it solves a pain you’ve felt - that was exactly the idea.

And yes, custom or expanded component libraries are definitely in the plans. I’m aiming to ship updates roughly once a month, so stay tuned!

Lembit Hunt

@hugors00 Great point! A custom library system is something we've talked about internally — definitely coming in future releases.

Lembit Hunt

@aleksandr_heinlaid Really proud of this one — lots of thought and small details went into making it smooth and usable.
Hope it helps folks mock things up faster right in the browser. Would love to hear what people think!

Aleksandr Heinlaid

@lembit_hunt Proud too! Let's see how it goes.

Michael Vavilov

The most useful UI Builder if you need to sketch smth on the go. Congrats on the launch!

Aleksandr Heinlaid

@michael_vavilov Thanks a lot! Glad you find it useful

Lembit Hunt

@michael_vavilov Thanks, that means a lot! The 'on-the-go' part was one of our core use cases.

Piotr Kusiak

@aleksandr_heinlaid Congrats on the launch. Definitely worth trying!

Lembit Hunt

@aleksandr_heinlaid  @k_piotr Thanks Piotr glad you’re giving it a try

Alex Lou

Congrats to the launch, @aleksandr_heinlaid !
Not sure if I am doing something wrong, but after installed the extension, nothing showed up. Any guidance?

Aleksandr Heinlaid

@fullstack_x Thank you! Just activate it on any website other than the Chrome Web Store.

Lembit Hunt

@aleksandr_heinlaid  @fullstack_x  thanks! let us know if you won't manage the problem

Alex Lou

@aleksandr_heinlaid  @lembit_hunt Thanks both! It worked after following the guidance. Nice job!

Eljo Prifti

Easy to use and lightweight, congratulations. Is there an option to add another person to an existing sketch/project?

Aleksandr Heinlaid

@eljo_prifti Thanks, really appreciate it!

At the moment, there's no option for real-time collaboration - it's a solo tool for now.

But that’s a great idea, and I ll definitely add it to the backlog for future updates!

Jun Shen

Perfect for quick prototyping during client demos! 👀

Aleksandr Heinlaid

@shenjun Exactly! That’s one of the main use cases we had in mind - live edits during client calls . Thanks!

Lembit Hunt

@shenjun Yep quick edits during live demos was one of our core goals thanks

Mara Ștefana Ilie

Super nice product! Congrats on the launch 🚀🚀

Aleksandr Heinlaid

@mara_ilie_ Appreciate it a lot! So glad you like it, Mara

Lembit Hunt

@mara_ilie_ Thanks Mara happy you liked it

Scott Busby
Wow, this looks amazing. I’m going to try it out and see if I can get a better UI going! Congrats on the launch!!
Aleksandr Heinlaid

@scott_busby1 Thanks, Scott! Hope it helps - would love to hear what you create with it!

Lembit Hunt

@scott_busby1 Appreciate it Scott !

Oxana Maurina

This makes so much sense, I’ve been in that exact spot on calls and it always feels clunky trying to mock something up on the fly. Curious, how fast is the flow from capture to editing? Feels like speed is everything here

Lembit Hunt

@alagerrka Thanks, totally get that - we've felt the same pain during calls. The flow is built to be instant: just click the icon, and you're dragging elements within seconds. No setup, no menus. Speed was a top priority from the start.

Tetiana Hryshmanovska

I was once in need of a tool like this — love that you made it affordable and available for everyone. Wishing you a great launch!

Aleksandr Heinlaid

@tetiana_hryshmanovska Thanks so much, Tetiana - really glad to hear that!

Deepanshu Chittoria

Well, good product for founders

Aleksandr Heinlaid

@deepanshu_chittoria Thanks! Yep , definitely aimed to help founders move fast and iterate visually

Lembit Hunt

@deepanshu_chittoria Thanks a lot founders were exactly who we had in mind

Natalie MacLees

Congrats on the launch! As someone who spends a lot of time giving design feedback and talking through UI changes, this feels incredibly useful. Being able to mock things up live in the browser without switching tools sounds like a real workflow upgrade.

Aleksandr Heinlaid

@nataliemac7 thank you! yep, skipping all the switching is what makes it feel snappy and smooth :)

Yura Pogosyan

This is so good! The simplicity is honestly the best part - no fluff, just open and use.

I’m dreaming of something like this but for mobile screens - to clear up so much miscommunication about changes

Big fan already. Congrats on the launch! 🚀

Aleksandr Heinlaid

@yura_pogosyan really appreciate it! mobile support is a great idea - we’re thinking in that direction too.

Eadin

Amazing, installed! are users allowed to change the typeface?

Aleksandr Heinlaid

@wang_yiting thank you! not yet, but custom fonts are definitely something we’re considering

Yong Woo Shin

The smartest way to communicate with developers!

Drawing a wireframe should have been easy like this.

Congratulations, @aleksandr_heinlaid@lembit_hunt!

Velebit Mirić

Neat one, this looks cool and practical, going to try it out and shout it out to my colleagues from Design :) Another tool that enables people to grow instantly is what I love to see <3

Aleksandr Heinlaid

@velebit_miric Thanks a lot for the kind words! Really glad it looks useful to you - and super excited to hear you’ll share it with your design colleagues. We’re all about building tools that people can use instantly and grow with.

Appreciate the support !