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Hi HN,I’ve been working on mljar-supervised (open-source AutoML for tabular data) for a few years. Recently I built a desktop app around it called MLJAR Studio.The idea is simple: you talk to your data in natural language, the AI generates Python code, executes it locally, and the whole conversation becomes a reproducible notebook (*.ipynb file). So instead of just chatting with data, you end up with something you can inspect, modify, and rerun.What MLJAR Studio does:- Sets up a local Python environment automatically, runs on Mac, Windows, and Linux- Installs missing packages during the conversation- Built-in AutoML for tabular data (classification, regression, multiclass)- Works with standard Python libraries (pandas, matplotlib, etc.)- Works with any data file: CSV, Excel, Stata, Parquet ...- Connects to PostgreSQL, MySQL, SQL Server, Snowflake, Databricks, and Supabase.For AI: use Ollama locally (zero data egress), bring your own OpenAI key, or use MLJAR AI add-on.I built this because I wanted something between Jupyter Notebook (flexible but manual) and AI tools that generate code but don’t preserve the workflow. Most tools I tried either hide too much or don’t give reproducible results and are cloud basedDemos:- 60-second demo: <a href="https:&#x2F;&#x2F;youtu.be&#x2F;BjxpZYRiY4c" rel="nofollow">https:&#x2F;&#x2F;youtu.be&#x2F;BjxpZYRiY4c</a>- Full 3-minute analysis: <a href="https:&#x2F;&#x2F;youtu.be&#x2F;1DHMMxaNJxI" rel="nofollow">https:&#x2F;&#x2F;youtu.be&#x2F;1DHMMxaNJxI</a>Pricing is $199 one-time, with a 7-day trial.Curious if this is useful for others doing real data work, or if I’m solving my own problem here.Happy to answer questions.

Show HN: Mljar Studio – local AI data analyst that saves analysis as notebooks

Hi HN — author here. iesna.eu is a browser-based ecosystem for working with photometric data: parsing standard luminaire files (LDT&#x2F;EULUMDAT, IES LM-63, Oxytech, ATLA-S001), running design calculations against EN 13201 &#x2F; ANSI&#x2F;IES RP-8 &#x2F; CJJ 45 &#x2F; IES-IDA MLO, and (the part I most want to show off here) rendering real urban scenes in Bevy with the photometric data driving actual streetlight behavior, including sky-glow contribution.
The Skyglow Analysis demo loads a real LDT file into a Bevy scene (Khronos Bistro test asset). 
The luminaire&#x27;s intensity distribution drives the streetlight rendering directly — no fudging — and the sky-glow grade updates live as you adjust the uplight percentage. Swap to a full-cutoff fixture and the sky goes from F (Severe) back to A (Excellent). You can see the difference on the buildings as well as in the sky.
Stack: Rust core (eulumdat-rs and friends, ~20 crates handling photometric formats), Bevy for the 3D rendering, WASM for browser deployment. No backend; everything runs client-side. About a thousand lines of new code on top of the existing photometric library to make the Bevy integration work.
Things I&#x27;d love feedback on:The atmospheric scattering model is currently single-scattering Rayleigh+Mie. Is that defensible for the use case, or should I move toward multi-scattering?
The Bistro test scene works well visually but isn&#x27;t a controlled environment. 
Anyone know of a public urban geometry asset that&#x27;s more typical of real road-lighting evaluation?
The CJJ 45 implementation (China&#x27;s national road lighting standard) is the only one I&#x27;ve had to reverse-engineer from translated PDFs. 
If anyone has primary-source experience with it, I&#x27;d value a sanity check.Open-source on GitHub (eulumdat-rs and the related crates).
Crates.io: eulumdat

Show HN: Browser-based light pollution simulator using real photometric data

Ti-84 Evo

Hey HN!I built SimplePDF Copilot: an AI assistant that can interact with the PDF editor. It fills fields, answers questions, focuses on a specific field, adds fields, deletes pages, and so on.It&#x27;s built on top of SimplePDF that I started 7 years ago, pioneering privacy-respecting client-side pdf editing, now used monthly by 200k+ people.As for the privacy model: the PDF itself never leaves the browser. Parsing, rendering, and field detection all run client-side.The text the model needs (and your messages) goes to whatever LLM you point at. By default that&#x27;s our demo proxy (DeepSeek V4 Flash, rate-capped), but you can BYOK and point it at any cloud provider, or go fully local (I&#x27;ve been testing with LM Studio).Unlike the existing &quot;Chat with PDF&quot; tools that only retrieve the text&#x2F;OCR layer, Copilot can act on the PDF: filling fields, adding fields (detected client-side using CommonForms by Joe Barrow [1], jbarrow on HN with some post-processing heuristics I added on top), focusing on fields, deleting pages, and so on.I built this because SimplePDF is mostly used by healthcare customers where document privacy is paramount, and I wanted an AI experience that didn&#x27;t require shipping PII to a third party.
Stack is pretty standard:- Tanstack Start- AI SDK from Vercel- Tailwind (I personally prefer CSS modules, I&#x27;m old-school but the goal since I open source it, I figured that Tailwind would be a better fit)The more interesting part is the client-side tool calling: events are passed back and forth via iframe postMessage.If you&#x27;re not familiar with &quot;tool calling&quot; and &quot;client-side tool calling&quot;, a quick primer:Tool calling is what LLMs use to take actions. When Claude runs grep or ls, or hits an MCP server, those are tool calls.Client-side tool calling means the intent to call a tool comes from the LLM, but the execution happens in the browser.That matters for: speed, you can&#x27;t go faster than client-to-client operations and also gives you the ability to limit the data you expose to the LLM. For the demo I do feed the content of the document to the LLM, but that connection could be severed as simply as removing the tool that exposes the content data.The demo is fully open source, available on Github [2] and the demo is the same as the link of this post [3]What&#x27;s not open source is SimplePDF itself (loaded as the iframe).I could talk on and on about this, let me know if you have any questions, anything goes![1] <a href="https:&#x2F;&#x2F;github.com&#x2F;jbarrow&#x2F;commonforms" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;jbarrow&#x2F;commonforms</a>[2] <a href="https:&#x2F;&#x2F;github.com&#x2F;SimplePDF&#x2F;simplepdf-embed&#x2F;tree&#x2F;main&#x2F;copilot" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;SimplePDF&#x2F;simplepdf-embed&#x2F;tree&#x2F;main&#x2F;copil...</a>[3] <a href="https:&#x2F;&#x2F;copilot.simplepdf.com&#x2F;?share=a7d00ad073c75a75d493228e6ff7b11eb3f2d945b6175913e87898ec96ca8076&amp;form=w9&amp;lang=en" rel="nofollow">https:&#x2F;&#x2F;copilot.simplepdf.com&#x2F;?share=a7d00ad073c75a75d493228...</a>

Show HN: Filling PDF forms with AI using client-side tool calling

Hi all, this is Burak.When agents became a reality one of the first things I wanted to do was to automate building dashboards. The first, and the most obvious, wall that I ran into was that a lot of the tools were just driven by UI. This meant that without the agents handling browser UIs and whatnot, it wasn&#x27;t possible to have the agents do that. In addition, it would be impossible to review any of the changes the agent would make.The first instinct there is to get your agent to build a React app for the dashboard. This works beautifully for the happy path, but I quickly ran into other issues there:
- every dashboard turns out to be different
- have to implement a backend to centralize the query execution
- there is no centralized mechanism to control the rules and standards around visualizations
- there is no way to get a semantic layer working with the dashboards easilyIn the end, agents ended up reinventing the wheel for every new dashboard, even under the same project. Building a standardized, local project for these turned out to be building a BI tool from scratch.After trying these out, I asked myself: what if the dashboards were built for agents as the primary user?A product like that would need to have a couple of features:
- First of all, everything needs to be driven by version-controllable text. YAML is fine.
- Changes to the dashboards should be easy to review and understand by humans.
- Agents are great at writing code, it&#x27;d be great if this were driven by code to have dynamic stuff: JSX would be great.
- Static analysis being a first-class citizen: validate dashboards before deploying. Agents can check their work too.
- A standardized way of deploying these based on a couple of files in a folder: operationally very simple.
- Built-in semantic layer to standardize metrics.That&#x27;s what I ended up building: dac (Dashboard-As-Code) is an open-source tool and a spec to define dashboards, well, as code. It contains an implementation in Go that can be deployed as a single binary anywhere. The dashboards are defined in YAML and JSX, YAML for static stuff, JSX for dynamic dashboards. You can run queries at load time to define conditional charts, generate tabs on the fly per customer, or list charts for each A&#x2F;B test you are running.I built it in Go because I do love Go, and I think it is the greatest language at the moment to work with AI agents.dac runs as a single binary, you can get started with a `dac init` command and it&#x27;ll automatically create some sample dashboards for you based on duckdb. It supports 10+ SQL backends, with more to come. It supports validation, custom themes and whatnot.You can see it here: <a href="https:&#x2F;&#x2F;github.com&#x2F;bruin-data&#x2F;dac" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;bruin-data&#x2F;dac</a>I would love to hear what can be improved here, please let me know your thoughts.

Show HN: DAC – open-source dashboard as code tool for agents and humans

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<a href="https:&#x2F;&#x2F;archive.ph&#x2F;6wKhx" rel="nofollow">https:&#x2F;&#x2F;archive.ph&#x2F;6wKhx</a>