Onlook for Mac - Download

The good stuff

The real-time preview is where Onlook shines. Change a button color, adjust padding, reposition a div - and the changes show up instantly in the preview window. No refresh, no build step. I was testing a form layout, and instead of guessing how a margin would look, I just dragged the field over. Boom, perfect alignment. It’s like having a live canvas for your React app. Also, the drag-and-drop interface is dead simple. Even my teammate who’s been writing React for five years said it felt “too easy.” Which, in this case, is a win.

The not-so-good

It’s definitely not for everyone. If you’re doing heavy state management or complex hooks, Onlook won’t help much. It’s focused purely on the UI layer, so if your component relies on deep logic, you’ll still need to dive into the code. Also, since it’s open-source and unknown developer, there’s no official support. I had to check GitHub issues when something didn’t load right - which isn’t terrible, but it’s a head-scratcher when you expect a polished tool. And yeah, it’s free, but that also means no fancy features like version history or collaboration. If you’re used to Figma or Webflow, this feels… barebones.

Bottom line

If you’re building React apps and hate staring at blank screens while waiting for builds, Onlook for Mac - Download for Mac is worth a shot. It’s lightweight, free, and does one thing really well. Not a replacement for full design tools, but a solid helper for quick UI tweaks. If you’re already in the React ecosystem, download it. No risk, no hassle. Just try it and see if it speeds up your workflow. It might just save you ten minutes a day - and that adds up.