Yan Holtz

So glad!! 🔥☀️ Less than a week back at work, and 72 people have already joined my data visualization course. d3-loves-react.com Thank you for the trust! 🙏

The dual Y axis chart lets you compare 2 series on the same plot. It's one of the easiest ways to _lie_ with data. So I made a little playground to highlight why it's problematic! react-graph-gallery.com/exam…

Love #data? Love when it looks beautiful? Marthe Viallet nailed it one more time! ❤️ Check the data art exhibition she organised for the ENSAI. It's open for 2 more weeks in Rennes, France. Follow her for more details on it. Soon to be added in data-to-art.com

Reviewed 40+ #dataviz projects for the Pacific Dataviz Challenge. Top caveats: 💀 Claude default look 📚 40 charts, no story ➖ Useless buttons 🥸 Text nobody reads 😮 Wrong chart type 🐣 Long lines 📽️ Endless animations 📍 Legends, not labels Details 👇 yan-holtz.com/blog.html

Want to have a good laugh? Ask "roast me" to your AI and read it loud to your friends!!! I hope it will be as tough for you than it's been for me :)

This graph has a lot of echo in France. ❌ It's not a simple line chart: - a very strong title - a hot topic - a LOT of annotations - a clean design - very good hierarchy of information It transforms data points in a real story! Just added it to dataviz-inspiration.com

Only in module B of d3-loves-react.com and someone created a scatterplot where you must hunt pokemons 😮 #Dataviz as a game?! egmvisualization.github.io/m…

Just found a very important graph on so many aspects!!! taxpolicy.org.uk/2026/05/30/…

Yeah a full #dataviz page in a newspaper today! It triggered many interesting, constructive discussions with my family. I wish newspapers were more about facts and general knowledge than sensationalism cherrypicked events... Awesome work by @Le1hebdo!

That's it! The Pacific Dataviz Challenge revealed the winners!! They are stunning and it was a pleasure to be a judge. pacificdatavizchallenge.org Checking the winning entries is 100% a good use of your time! Both for #dataviz and climate knowledge Congrats

I'm working on a set of "Dataviz caveat flashcards" I feel like the geospatial category is weak so far. In your opinion, what are the most common caveats ppl do when they build maps??? 🙏🙏🙏🙏 (Note: I have 50 cards so far, published soon :))

Interactive #dataviz really turns data into something you can "feel" and explore. Check this example by Thomas Heggelund that shows where traffic accidents take place in the best visual way! norway-charts.netlify.app/ro… Of course, instant add to Dataviz-inspiration.com! 😋

Yay, just shipped a new version of the python-graph-gallery.com!! Editable code No ads Everything faster Search bar Zillion bugs fixed! Please let me know if you find anything wrong!?

🧂 Don’t spoil the #dataviz dish! Code is basically free now. Tooltips, buttons, extra charts, gradients, confetti... More, more, more. The real challenge is the opposite: → one story → one chart type → zero clutter Less, less, less!

I'm curious... Do you recognise this? Please tell me I’m not the only one who’s seen it a thousand times. 😛

Animation to show timeseries? 🤔 I've always had mixed feelings about that. Race bar charts... Animated line charts... I feel like they are often wasting my time. But this animated density map is just perfect! ❤️ Instant add to dataviz-inspiration.com!

So glad! 🎉☀️🍾 183 ppl enrolled in my #dataviz course already! D3.js is really becoming the norm in this AI era. If you too want to be able to build absolutely any kind of interactive chart, there are a few hours left to join! d3-loves-react.com

Good #dataviz joke so basically impossible for me not to share! If you don't want to create charts like this... check my d3-loves-react.com 😀

D3.js is becoming incredibly popular for #dataviz, thanks to AI. If you're wondering what it is & why it's so great, I wrote an article on the topic! react-graph-gallery.com/cour…

Stumbled on an awesome static graph. But got frustrated because I couldn't find my country.. So I made an interactive version of it: search bar + hover effect 😀 AI is going to have such a big impact on the way we consume charts react-graph-gallery.com/exam…

Just added a few graphs to my Dataviz-inspiration.com collection! There are about 500 hundreds dataviz projects there, filterable by chart type!