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Posted by SirHound 8 hours ago

Show HN: CSS Studio. Design by hand, code by agent(cssstudio.ai)
Hi HN! I've just released CSS Studio, a design tool that lives on your site, runs on your browser, sends updates to your existing AI agent, which edits any codebase. You can actually play around with the latest version directly on the site.

Technically, the way this works is you view your site in dev mode and start editing it. In your agent, you can run /studio which then polls (or uses Claude Channels) an MCP server. Changes are streamed as JSON via the MCP, along with some viewport and URL information, and the skill has some instructions on how best to implement them.

It contains a lot of the tools you'd expect from a visual editing tool, like text editing, styles and an animation timeline editor.

111 points | 82 comments
evancaine 7 hours ago|
Congrats on the launch.

Now put a giant, 30 second video of the product being used, directly below "Design by hand.Code by agent."

No one is clicking Get Started or Buy Now until they know what the product is, and a 30 second video is 100x better than any amount of text.

upmostly 2 hours ago||
This comment was surprising to me.

I never considered that people want to watch a video in this day and age when they can try the real thing.

Perhaps I've fallen into that trap with the product [1] I'm building. I have a "Live Demo" button on the landing page and thought that would be enough? I'm going to reconsider...

1. https://dbpro.app

jaredklewis 22 minutes ago|||
Perhaps it depends on the product, but interacting with demo almost certainly requires more effort than to watch someone else do a demo.

As for me, I’d like to watch a short clip (or at least see screenshots) before I try to demo anything.

noodlesUK 47 minutes ago||||
I think there’s a big difference in commitment between the level of friction in signing up for a service and spending a couple of min on orienting myself and clicking play and watching the happy path go for 30s.
sebmellen 26 minutes ago|||
Very cool app. How do you feel it compares to something like TablePlus?
SirHound 7 hours ago||
I did have a video on for launch but removed it when I added CSS Studio itself to the page (check top right). Perhaps it can make a return though!
sassymuffinz 7 hours ago|||
I'll be honest I didn't notice it sitting up there in the top right until I saw this message, it's in that area I ignore where people usually put social logos etc.

Anyway - question on the software itself, how would CSS changes feed through to the code? Inline CSS, utility classes if you're using a framework? Does it support using something like Vite for compiling?

K3UL 1 hour ago|||
I agree, I almost missed it and left the website.

Too bad because once I saw it and tried it out, that's when I thought the experience feels slick and polished.

I think you shoud consider either having an onboarding that highlights it or put a giant arrow on your landing page background, between the video and the bar, with a "Try it on this page"

SirHound 6 hours ago|||
All the technical decisions are yours. If you defined a padding (for instance) in a stylesheet, this is where updates will be applied. Likewise if it was on a style attr or elsewhere.
yoz-y 6 hours ago||
I think it would be preferable if the agent figured out the right place to do this.

When I debug CSS or toy with styling, I will often edit the element styles directly but naturally I would like them to be applied within classes the element has, or maybe add a new utility. Never would I put styles on the element.

I suppose that in the same fashion, if your project uses tailwind or something, you will edit styles manually but when you get it right you want them to be added as “whatever the code uses”

SirHound 6 hours ago||
Sorry, I mean to say the agent does figure out the right place, based on your technical decisions. So if you want to use classes it isn't going to start adding style attributes. The skill contains instructions about following the existing setup within the codebase.
sassymuffinz 3 hours ago||
So if I’m using Tailwibd let’s say, and then I adjust the padding on an element does it update the HTML (or does the agent update my html) with an alternative padding class like p-4 or p-[11px] or something if nothing matches?
serial_dev 7 hours ago||||
I’m on mobile, I’d much rather see some visual demo, ideally video, explaining your product in 60 seconds or less than try to tap around in the live demo.
SirHound 7 hours ago||
It's a great point, I added the video back
BloondAndDoom 5 hours ago||||
“Don’t show them the keys of the piano, play the moonlight sonata. “

The key to a good demo is not listing or even showing the features, it’s showing them what they can accomplish with it. You need to inspire your prospects.

gianthard 7 hours ago||||
The video better be visible on mobile. I read HN on phone.
SirHound 7 hours ago||
It's a fair point - deployed
bossyTeacher 7 hours ago||||
You need a video. Time is money
SirHound 7 hours ago||
It's up!
threethirtytwo 6 hours ago|||
bro listen to the guy above you. You need the lowest friction way to help users visualize what this is. By low friction I mean the exact way tik tok gets people to watch thousands of videos for hours. Only one click and zero brain power.

I wanted to buy this. I tried the demo, but then I hit a wall of no agent connected and gave up and came here looking for reviews on whether this is good or shit.

SirHound 6 hours ago||
Yeah about an hour before you sent this I updated the homepage with a video.
andreasley 12 minutes ago||
Unfortunately, that video does not explain anything at all. I now know that the product can be used with a mouse, that I can select things and set some properties. Who is it for? What does it do? Why should I use it?
tyleo 7 hours ago||
The landing page feels tacky to me. It has a similar style to what I’ve seen LLMs churn out across the internet. Unclear if it’s actually generated or not but it’s at least in that style.

For a design product, I’d expect it to have more personality.

I’d recommend reving the landing by hand. The sense I get is that this tool can make a site that looks like everyone else’s. It would be neat to see something unique.

BloondAndDoom 5 hours ago||
This was my biggest take, when I see someone selling a design tool that’s looks very much like designed by LLM, that’s a red flag. I got the exact same vibe, no idea whether it was a prompt or a detailed design, but right now it looks like output of a prompt and not hand crafted.

Given the whole idea is selling a design tool that’s looks very gives user a sense of they can control details, this page doesn’t deliver that at all. I’d focus on the design, because that’s the biggest demo of your product maybe even bigger than the demo.

Imagine a unique website that users looks and feel like I wish this was my website. A rare instance visual design actually matters for a startup :)

SirHound 5 hours ago||
I think it's a good point. I'm going to spend a bit more time on the design - and if sales continue well then I can look at getting a designer.
Citizen_Lame 3 hours ago||
The irony.
Dansvidania 2 hours ago||
What irony? This is a design tool, it does not make you good at design.
SirHound 7 hours ago||
I suspect its the color scheme? I wanted something to contrast with but pair with https://motion.dev but I know AIs pump out a lot of purple. I'm mostly a developer though so my design skills are a little rusty still!
duskdozer 5 hours ago|||
A big smell and my biggest pet peeve with them is the excessive, custom javascript animations that don't respect my settings to disable animations and which break through my own extra defenses, all tucked away in some webpack chunk I'd have to debug to get rid of. As soon as I see above-the-fold text fade and slide in I close the tab to spare my head, stomach, and CPU.
BloondAndDoom 5 hours ago|||
Motion page looks much better, but other than purple I’d focus on design more, even to suggest hire a designer on project basis, let them make a stunning landing page. If you are selling a design tool (arguably CSS is somewhere in between) then you have to show your mastery of the domain. —assuming you are serious and it’s not a weekend project
mpeg 6 hours ago||
Motion is an excellent library so I gave this a go on a prod site. Some feedback

- I LOVE the concept, no clunky SaaS, you add the package and start it on your dev server and it just works. It seamlessly did with my vite based build.

- Needs a diff view which tells me what the agent is going to change when I publish my changes, right now it's a bit scary to use without it (not sure if it does once you try to publish changes, I didn't get that far in the process)

- I don't see the point of the "draw" feature. Maybe it's because I envision this kind of tool being used so that non-technical members of the team can make small design changes without dev support, and not as a way to design from scratch, but maybe you have a use-case for it.

- Integration with tailwindcss would be a killer feature, this particular project uses tailwind so all the styles in the style view show as the default ones but of course they're being applied via classes. You could detect tailwind classes and either show them separately or resolve them and show what they do in the styles view, then on publish you'd tell the agent to edit using tailwind classes

I agree with what others have said, a video or even better a live demo would be great. A demo would be extra work but would be super cool, as a stopgap you could have a stackblitz demo maybe.

The client-side injected js -> mcp flow is brilliant though. I might have to steal that idea for some projects I'm working in, I can imagine a lot of scenarios where it would make a great interface

SirHound 6 hours ago|
Thanks for your feedback!

I just pushed a video to the homepage, there was already a live demo though, it was actually quite simple to implement (mostly gate a few things). There was a bit of a fear that agent somewhere out there would still be listening though...

I think a diff is an excellent idea. Perhaps with the ability to remove specific changes and switch before/after.

In terms of Tailwind, I'm thinking about a token/strict mode which would detect Tailwind classes and CSS variables. It wouldn't expose these in the sense you had to apply each one manually, but if you were for instance changing padding, it would snap between all your pre-defined tokens.

For the draw feature I think I'm just heavily Framer-pilled and it lets you pre-determine a rough width and height within a stack. But perhaps there's space for a click-to-add also with minimum dimensions.

mpeg 6 hours ago||
Sorry I'm blind! I completely missed the live demo. I think because it's on the top right corner I instinctively ignored it.

Maybe could have a "Try live" button that sort of nudges you to it (could open the sidebar with the page structure or something to make it obvious you're in "edit mode") if other people struggle to find it

Re. diff view, yes, I think it's the kind of thing that would give reassurance to users that they can play around with it without breaking anything, otherwise I feel I'd be a bit scared of accidentally touching something that shouldn't be changed (especially as you might experiment a bit before you land on the right style to change)

itsevrgrn 1 hour ago||
A bunch of comments are complaining about how it's crazy that this is $99 or that they'll vibe code a free version this weekened. I've tried to make a similar tool for myself that let's me change CSS values live without talking to the agent and it made me appreciate the hundreds of invisible details that figma, framer, paper, etc. get right when building a visual canvas editor. I spent 6 hours going back and forth with claude just to get the editor to feel somewhat usable for editing existing front end work.
unvalley 2 hours ago||
I like this concept and it definitely fits current AI era. There’s still a lot of room for humans to clean up the kind of sloppy, AI-ish design that tools tend to spit out today. I’m sure that will keep improving, but for now you still need a human hand on it.

I get that this tool is aimed at designers, but depending on how the features evolve I think it could pull in a lot more indie devs and similar folks too.

Polarity 1 hour ago||
good idea. will vibe code a free alternative this weekend.
Yabood 55 minutes ago|
Come back on Monday with a link.
lapinovski 3 hours ago||
you should definitely highlight the edit button on the right corner. until I've noticed it, I was quite skeptical. after playing around - I'm immediately sold (i'm on desktop btw)

congrats on launch, nice product. Hope this would be a thing.

supliminal 1 hour ago||
Did HN not prohibit/restrict A.I.-driven Show HN entries?
Vachyas 5 hours ago||
The video was really good, and the UI looks fun too.

If I understand correctly, is this not as useful for frameworkless html/css/js development? Since when you make edits using browser-built-in-devtools it can and does modify the actual css files (in-memory, of course) which you can use to copy-replace with entirely (assuming no build/bundling step aswell).

If so and this allows you to use any framework and still have that kind of workflow, that's fantastic. Half the reason I don't like using frameworks is because I lose the built-in WYSIWYG editor functionality. Guess I'd still lose the usefulness of the built-in js debugger, tho :(

SirHound 5 hours ago|
Yeah I mean you can basically achieve this set up even with frameworks, if you're using stylesheets, but it's the copy/pasting and finding source code that is usually the pain. With this you just press apply (or enable auto-apply) and your agent gets to work. You can also edit the content, add/remove/reorder elements etc, I don't know how good the browser dev tools are at writing all that back though.
codetiger 6 hours ago|
Unlike other comments, for me the experience on the product marketing worked well and straight forward. After reading the title and landing on your homepage, I had the feeling that this is yet another product claiming WYSIWYG like editor for the web claims on making CSS editing easier. And yes the product achieves same as I thought. Video confirmed it, and homepage live demo confirmed it again. Surprisingly the claim feels true, this time. It feels natural and UX feels great.
SirHound 5 hours ago|
Glad you enjoyed it! Thanks for the feedback. In fairness some of the the things like a video on the homepage are there as a response from initial comments in this thread.
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