work in progress: made uchimata (github.com/hms-dbmi/uch...) into a Mosaic client, so that I can hook it up with quak (github.com/manzt/quak) for some nice brushing action

If you've ever been confused about what's the difference between multiple coordinated views, linked views, brushing and linking....you're not alone, there's two of us! I wrote up my notes from researching the terminology around this key visualization concept.

this is what peak productivity in 2026 looks like.

Introducing quiver: a (type-safe) place to keep your arrows @arrow.apache.org quiver is a small schema library for Arrow, built on @idl.uw.edu flechette - Define table schemas in TS - Validate schemas at IPC parse time - Get back fully typed Tables (no type-casting) github.com/manzt/quiver

my wife **really** wants one of these trader joe’s tote bags. that’s what vibe coding is for.

it’s a start

Released an initial version of scattered (github.com/dvdkouril/sc...), a 3D scatterplot library for the web and computational notebooks. Core ideas: - webgpu-based rendering - arrow/dataframe as input - minimal dependencies and small bundle size - available as a JS package and a Python widget

playing around with umap-js today.

A nice use case for Claude Code in my work: reviving old research prototypes. When it comes to surveying interactive features of past tools, we often have to rely on static figures and descriptions in text. Sometimes there’s a video. That can be pretty limiting.

we’ve got some selections going!

revisiting my webgpu-based 3D scatterplot library after a year.

Just so you know: if you delete your twitter/x account, it will come back up at some point, and show that it’s been active from an arbitrary, impossible date. Reporting impersonation is also useless.

TIL that Advent of Code was invented in Salem, Massachusetts www.youtube.com/watch?v=uZ8D...

i can’t be the only one who procrastinates on work by making tools for tracking and visualizing work

haven’t seen that much snow in a while!

Made a little visualization of my workouts from last year.

hello, marimo

My #IEEEVIS 2025 paper explorer is live! 🎉 👉 johnguerra.co/viz/ieeevis2... 👈 An interactive #dataviz to explore 300+ papers by similarity. Perfect for: ✨ Discovering papers related to your interests ✨ Planning which sessions to attend ✨ Creating your own paper list (new!) Pls help me distribute it

after spending all year behind the paywall, part 1 of my documentary series FOOL TIME is now unlocked and free to watch for everybody: www.patreon.com/posts/fool-t...

if interested in creating anywidgets of your own, our tutorial was finally shared to youtube: www.youtube.com/watch?v=frEo...

I have been playing with filtering of 3D structures (represented as Arrow tables) via duckdb-wasm… It’s been going pretty well!

not completely done reading it yet, but this is definitely one of my favorite survey papers: onlinelibrary.wiley.com/doi/10.1111/... interactive browser: uclab.fh-potsdam.de/unfoldables/ @uclab.bsky.social

totally unrelated to anything happening these days, but I now have a CV on my webpage: davidkouril.com/cv

“boy do I have some bad news for you…this is gonna be a pie chart” reproduced this beauty from @jonbois.bsky.social

IMHO, make this the default, github: github.com/ghostty-org/...

watch out, trevor’s about to drop some knowledge, now in a blog form

i explored +130k artworks from the National Gallery of Art with polars, observableplot, anywidget, react... turns out there’s some neat public works history hiding in there. maybe you’ll find an (CC0!) upgrade for that default OS wallpaper 🙃

one of the first things I add to any ts project now is an `assert` utility: manzt.sh/assert.js type assertions (`foo as string`) blindly tell the type checker you know more than it does. `assert` is a real runtime check with the same narrowing effect. you'll thank me later when debugging!

this is pretty much as good as computer graphics gets. #webgpu

A belated ode to 2024! lifeinbytes.substack.com/p/year-in-re...

Oracle justified its JavaScript trademark by claiming Node.js — now it wants that ignored #FreeJavaScript deno.com/blog/deno-v-...

We systematically analyzed the visualizations used in 1,846 subfigures from 45 human single-cell atlas publications in a survey on The State of Single-Cell Atlas Data Visualization in the Biological Literature. 📝: osf.io/preprints/os... 🔍: keller-mark.github.io/sc-star-site/

some children books are very relatable

recorded a video about anywidget :) touches on how to develop in the early prototyping stage, when both the JS and Python parts change often www.youtube.com/watch?v=yL1k... @manzt.sh

Released juv v0.3.0! 🎉 Brings uv's locking for standalone scripts to Jupyter notebooks. Lockfiles are embedded directly in metadata for self-contained, reproducible notebooks. - `juv lock` generates a lockfile - `juv tree` shows dependencies - `juv export` outputs pip-compatible format

i’ve been working on rendering many (16+) scenes with threejs in a single page. the performance is…suboptimal.

just got back from the 4D Nucleome annual meeting. always fun to be the one poster with fancy images but zero biological novelty (compared to the rest). folks couldn’t have been nicer and more welcoming though!

making something physical really forces you to appreciate how easy we have it in the software world, with all the undos and things.

a surprisingly useful tool for paper reading, especially to quickly skim through a large number of publications! 8bitdo micro

i’ll start posting about work soon i promise

drawing nina, part 1/N

venvs are a leaky abstraction. with uv, they are disposable. no more: ``` python -m venv .venv source .venv/bin/activate pip install -r requirements.txt ``` just `uv run`. some thoughts on notebook reproducibility in a post-uv era: github.com/manzt/juv#mo...

tinkering with a "managed" mode for `juv run` - launches notebook sessions in subprocess with cleaner logs and a minimal/consistent tui. thanks to @dvdkouril.xyz for the idea 🙃 before/after:

How can we combine multiple visualization interfaces to make a system learnable and expressive? Our 🏆 Honorable Mention paper at #ieeevis introduced a conceptual framework, Blended Interface, and its implementation for genomics data visualization. Read our paper at t.co/prQlzG8W6B

my first feature PRs landed in uv v0.4.21! you can now uv run scripts (with deps!) from stdin and URL uv run manzt.sh/hello.py