Most AI coding tools build new websites. Sider Code changes the ones you already live in — restyle any page, add features it never had, all with plain words. And it sticks. Now with GPT-5.6 Sol from OpenAI Developers. Free for everyone for the next 3 days:

Same X. A completely different look. Sider Code restyles X as an early-1900s newspaper, while keeping every link and button working. Try it:

Thirty scattered posts. One clean article. Sider Code turns an X thread into a readable article with a table of contents. Try it:

The same Amazon search, without the sponsored clutter. Sider Code hides sponsored products so you can focus on organic results. Try it:

@OpenAIDevs This feature is so cool! I used it to customize my interface, and now my feed is much cleaner, with none of those annoying ads. Good job!

Hundreds of Reddit comments. The useful viewpoints are buried. Sider Code adds a clear overview that brings the key viewpoints together. Try it:

@OpenAIDevs Impressive launch! Sider Code looks powerful

@OpenAIDevs Such a cool angle — restyling the web you already live in with plain words is genius!

@OpenAIDevs Love the shift from generating sites to improving the ones you use

@OpenAIDevs It was real fun testing it :)

@OpenAIDevs Thanks so much for taking it for a spin! What was the coolest thing you ended up building with it? 👀

@OpenAIDevs Modified hacker news website 😊

@OpenAIDevs 改现成网站比造新站难，持久性是硬骨头。三天免费先试水。

@OpenAIDevs sider code free for the next 3 days wow amazing

@OpenAIDevs Finally someone improving existing experiences instead of starting from scratch

@OpenAIDevs levels great work sider

@OpenAIDevs I want to change the font being displayed on a website and it couldn't do it, but it told me all the third party extensions I could use all while eating up my free credits. This limitation has motivated me to uninstall and delete my sider account.

Hi, do you try the Sider Code feature?

Edit the web like its your doc Yes please Free for 3 days too

@OpenAIDevs Editing existing sites with plain words is huge

@OpenAIDevs Exactly. You shouldn’t have to rebuild a site just to make it work better for you.

@OpenAIDevs 不用重搭一套，直接改现有页面，省事多了

@OpenAIDevs Exactly. Keep what works, change what doesn’t.

@OpenAIDevs It's so interesting. I will try it now!

@OpenAIDevs Let us know which site you customize first!😍

@OpenAIDevs This is such a clever take not building new sites but upgrading the ones you already use, just with words. Love that it sticks!

@OpenAIDevs The ability to actually modify existing sites with plain words is seriously impressive.

@OpenAIDevs The persistence depends on finding the same parts of the page after every load. That gets tricky when a site changes its HTML, so I am curious whether Sider saves the intent of an edit or the exact CSS selector it first generated.

It saves the JS/CSS/HTML elements. We plan to have a feature to detect the HTML change and adjust the customization code automatically when necessary.