Drag & Drop

Start by dragging & dropping your project folder onto the window.

Start by dragging & dropping your
project folder onto the window.


Write LESS-Code with variables, mixins, operations and rules.

Write LESS-Code with variables,
mixins, operations and rules.


Save your *.less file and your done. SimpLESS compiles your file into CSS.

Save your *.less file and you're done.
SimpLESS compiles your CSS file.

Features you'll love


Image: CSS-Minification

SimpLESS will squeeze the last bit out of your CSS document, that’s integrated CSS-minification.

On-the-fly compilation

Image: On-the-fly compilation

SimpLESS recognizes when you save your *.less file and immediately compiles your CSS-Code.

@import parsing

Image: Backwards @import parsing

Divide your LESS-Code into as many files as you want. SimpLESS will observe them all to trigger compilation.

syntax errors

Image: Displays syntax errors

SimpLESS recognizes if you wrote invalid LESS-Code and because it’s so smart it will show you where.

Cross-browser CSS-prefix

Image: CSS-Minification

It’s like wizardry: Prefixes allow you to easily achieve cross-browser compatibility, thanks to prefixr.com.

Automatic LESS-updater

Image: On-the-fly compilation

SimpLESS will always keep itself up-to-date with the latest downloadable version of LESS by cloudhead.

Out of the box notifications

Image: Backwards @import parsing

To make sure you notice when something went wrong SimpLESS will show you a notification.

Works with Twitter Bootstrap

Image: Displays syntax errors

Bootstrap maybe is Twitter’s biggest gift for developers. We love it. And SimpLESS does so too. Try it yourself.

Why we created SimpLESS

The challenge

We want a CSS that can keep up with our brains and which doesn’t feel like assembly-line work. Yes, CSS really got better over time but working with it just feels like back in 1998. We don’t want to type the same statements again and again …


We use LESS to achieve more. LESS is a dynamic stylesheet language which extends CSS with dynamic behavior such as variables, mixins, operations and functions. If you want to learn more about LESS, visit www.lesscss.org.

LESS is the dynamic stylesheet language
SimpLESS compiled a few seconds ago

Challenge: Closing the gap

Writing LESS is cool and lightning fast if you compare it to good old CSS and besides, it trains your thinking in solving functional problems. So far so good, but in the end the web needs a CSS file to show your website as it is. Either you embed a javascript file to live-transform your LESS-Code into CSS in your browser or you find out how to precompile your files into standard CSS.

The “click-booom”-effect

The most powerful thing SimpLESS does: Save your *.less file and, BOOOM, SimpLESS generates a 100% valid standard CSS document out of it. No further steps, it’s that simple.

Our personal challenge

We want to get better every day and more importantly want to improve the world around us.
Sounds a bit naive? — maybe it is!

Let’s make it better together

We made SimpLESS Open Source on GitHub.
Now we invite you to join the worldwide group of developers to take SimpLESS to the next level. And don’t hesitate to send us your feedback.

Fork us on github

Available for free for mac, linux and pc

Download SimpLESS now!

More about LESS and how it works

LESS extends CSS with dynamic behavior such as variables, mixins, operations and functions.

As an extension to CSS, LESS is not only backwards compatible with CSS, but the extra features it adds use existing CSS syntax. This makes learning LESS a breeze, and if in doubt, lets you fall back to CSS.

Visit www.lesscss.org to read more about LESS.

As easy as it looks like. Try it yourself and you’ll save a lot of time - it’s lightning fast!

News & Buzz


July 3rd, 2012 SimpLESS Update 1.4

December 22nd, 2011 SimpLESS Update 1.3

November 4th, 2011 A Retrospective:
Ten Days SimpLESS

October 31st, 2011 SimpLESS Update 1.2 available

October 24th, 2011 SimpLESS helps you to easily write beautiful CSS

Kind words

I love LESS. I love well designed, smooth, functional, open-source software. I also love software that works on any platform I find myself using. If I could kiss Kiss, I totally would! Maurice Griffin, Web Designer and Developer @ Willamette Studios

Thank you for this wonderfull compiler! Not being able to use less from the desktop is the only reason I did not use it. Wonderful work! Thomas Macher

I've been experimenting with .less on and off for a while, but the deployment process made it restrictive for rapid web development. SimpLESS changes all that by making .less easy—enabling me to write more robust CSS. Jon Roobottom @ roodesign.co.uk

Finally an app that compiles .less files into .css files and works on all three big operating systems. I've been waiting quite some time for a LESS.app like application for Linux. And in my opinion SimpLESS looks pretty awesome. Florian, Web Developer

Windows based designers, if you want to use LESS and don't wanna process client side in the browser, check out SimpLESS awesome Steve, Web Designer @ RedHouseWD

SimpLESS is great! I've been waiting for such a thing for some time now. Jonathan Hedrén, Web Professional @ jonathanhedren.com

My LESS dream has come true! A LESS app for Windows! Chris LaChance, Web Designer @ chrislachance.com

Send us your opinion


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