DeepSite V3: The Free AI Coder Changing the Game

Deepsite V3.1 got a bit overshadowed when Gemini 2.5 Pro was released, but Deepseek's new model is actually quite amazing. It's incredibly cost-effective. Not even being marketed as a reasoning model, it somehow outperforms models like Claude 3.7 Sonnet, which is truly impressive.

I'm really impressed by this model considering it's almost 10 times cheaper than Claude 3.7 Sonnet while offering nearly the same capabilities. The AER leader boards show significant improvement over the previous model and it performs exceptionally well in my own tests, which is remarkable. It shows an improvement of about six points in mmu, while gaining 9.3 points in GP QA and approximately 19.8 points in aim.

It's open source, so you can view the code and even duplicate the space to use it according to your needs. Let me show you how it works. On the left you can see a basic HTML page where you get the page code that renders what you see on the right.

It’s very intuitive and similar to VS Code, which is great, and you can also edit the code manually.

You can see a mini map of the code, the file name, and other helpful features.

Looking at the interface, you can see the code on the left, and if you look down you'll notice the prompt box.

This is where you enter prompts about what you want the AI to create.

You can ask it to generate any kind of app or tool you need.

It only generates code in a single file and only uses HTML, which might seem limiting, but it actually works quite well in practice.

You can reset the code by clicking the New button, which will revert the code to the default template, which is very convenient.

Then you have the preview section where any changes to the code are immediately reflected.

You can also manually change something in the code, and it will update in the preview as well.

DeepSite V3: The Free AI Coder Changing the Game

I asked it to make me an image Cropper tool. I entered the prompt, sent it, and the code started streaming immediately. We needed to wait a bit as the code was somewhat lengthy, although DeepSeek is quite fast these days.

It finished, and the completed generation looked great.

The result is actually amazing.

I believe this system is optimized to deliver excellent one-page results, which is perfect since it's mainly focused on creating compact tools for specific needs.

This is quite impressive. You can see a variety of options here, and it works remarkably well. I haven't seen such good results from such a simple prompt before, and the system prompt must be doing wonders here.

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Performance snapshot

It performs exceptionally well in my own tests too, which is remarkable. It shows consistent gains across benchmarks I care about. The cost profile stays very attractive for the capability it offers.

What it is

Deepsite is a Hugging Face space for DeepSeek V 3.1. It is open source, so you can view the code and duplicate it. You can use it to generate compact, single-file tools quickly.

Interface overview

You get the code editor on the left and the live preview on the right. The prompt box sits below where you describe what you want the AI to create. It keeps everything in one HTML file, and the preview updates instantly when you edit.

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Quick start

Enter your prompt in the box at the bottom. Click New to reset the code to the default template if you want a fresh start. Edit the HTML, CSS, or JavaScript in the left pane to tweak the output, and watch the preview update.

Image Cropper tool

I asked it to build an image Cropper tool. The generation streamed in and finished cleanly. The final tool offered useful options and worked remarkably well from a single prompt.

I found the results especially strong for compact, one-page outputs. The layout looked good, and the interactions were responsive. It felt like the underlying prompt design is tuned for this exact workflow.

Scribble and save tool

I asked it to build a tool that allows me to upload an image, scribble over it, and save it back. This is fairly complex since handling canvas elements can be challenging, especially in a single HTML file. It worked on it, finished, and the app was ready.

You can upload an image, choose the color along with brush size, and you also have options to clear drawings and save the image.

You can easily draw over the image based on the settings you've selected above.

This is genuinely impressive and works exceptionally well for small tools.

Many people generally want simple options to generate basic tools for specific tasks, so this can definitely be useful in that regard.

It works really well for most tasks, which is great to see.

For this kind of utility, the one-page approach is a strong fit.

3D sailing ship game

I asked it to make me a simple 3D sailing ship game to see if it could handle the challenge. It wrote the code, and we had a functioning game. It looks good and works smoothly, especially considering it's all done in one page and completely free.

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Open source and local use

The code is open source, and you can view it in the file section.

You can examine the code, clone it locally to run it, or even run it locally with Docker.

That makes experimentation and customization straightforward.

I really appreciate small tools like this because they make creating simple utilities easy, which is what most of us need.

I genuinely like it a lot, and you get the code, which you can also run locally.

Feel free to use it as much as you want and create some cool projects with it.

Final thoughts

DeepSeek V 3.1 delivers excellent performance for the price, with strong gains across coding and reasoning benchmarks. Deepsite takes that capability and makes it practical for building compact, single-file tools that look good and work well. Overall, it's pretty cool and genuinely useful for quick apps, utilities, and even simple games.