Flox
@flox.dev
https://flox.dev https://github.com/flox/flox flox init flox install <package> flox activate git add .flox/ git commit -m 'add repeatable dev environment' git push
Signing a person in and authenticating a pipeline are two different jobs. FloxHub now treats them that way. Today, we are announcing two new credential types for FloxHub: Service Account Tokens for automation, Personal Access Tokens for people. Full writeup: buff.ly/Qdhjrk9
Auto-activation is here for Flox environments. Walk into a directory with a .flox folder and the environment turns itself on. Nested environments and services come along too. Your environments become one less thing to think about. Read the full post here: buff.ly/8CYRuSbhttps...
One tool. Every language. Declare Python, Node, Go, Rust, or whatever your project needs in a single Flox environment. Flox activate, and the exact versions you pinned land first on PATH. Same on macOS and Linux, no containers. Change a version? That's a reviewable diff. buff.ly/de8Wb25
People keep asking how to set up their AI stack as code. So here's the pattern: one Flox file — packages, versions, services — that your whole team activates. Same stack on macOS, Linux, WSL2, CUDA or Metal. Link here: buff.ly/PVaRl8m
Getting the same environment twice was never easy. Now a coding agent installs dependencies and changes your system while you're not looking causing your laptop to drift further from prod. Flox CPO James Bayer gets into it on Temporal's Vibe Check: buff.ly/HWaXb38
Shai-Hulud doesn't break in. It gets installed, then reads whatever credentials are lying around and ships them off. A hermetic build keeps nothing lying around: no ambient creds, no network. It can't steal what it can't see. Link to full blog: buff.ly/Xw2Jie6
Couldn't make Planet Nix 2026? Or made it, but spent the whole time in the hallway track? Either way, the talk recordings are all on YouTube now. buff.ly/sG5nlLg
It trains on your MacBook then it hits Slurm and dies: wrong CUDA, missing libs, broken paths. Not another container. One Nix-pinned environment, identical from laptop to cluster to prod. We trained nanoGPT on Slurm to prove it: buff.ly/JJJd5yP
We're going live with Temporal on June 24. James Bayer shows how a reproducible Temporal + AI dev environment goes from a stack of manual setup steps to one command: `flox activate`. Then more on sandboxing, security & observability. 📆 Jun 24 · 11am PT · buff.ly/8xH3pQu
Planet Nix is back. April 1-2, 2027 in Pasadena. Two days of Nix in production — the talks, the workshops, and the people building with it. The CFP is open. If you've shipped something real with Nix, get on stage: buff.ly/sJ1qFRe
Resolve runs their developer environments on Flox: reproducible, the same on every machine. Read the story: buff.ly/vsoFqpL
Dev containers or Nix-style environments? False choice. Declare your runtime — language, libraries, build tools, CLIs — natively on the host with Flox, Nix, or Guix. Keep backing services in containers. The same split runs local → CI → prod. buff.ly/Y27BWgA
Flox is powering Resolve AI’s dev environments. Resolve triages production incidents for the world’s biggest companies. Their team now builds on reproducible Flox environments: one shared setup that can run locally, in CI, and in prod. Learn more here: buff.ly/m7m9TDo
We are proud to announce @flox.dev as a Closure tier sponsor for #NixVegas at DEF CON 34! Their help will allow us to provide DEF CON badges for our speakers CFP still open until 2026-06-15 ➡️ cfp.nix.vegas/2026/ Sponsor us ➡️ nix.vegas/2026/sponsor
Today we're publishing a new playbook for platform teams: how to standardize project environments without forcing every team into the same stack. buff.ly/USXS8Ng
Flox | Platform Teams and the Challenge of Works-on-My-Machine
A practical guide to creating and working with Flox standardized local development environments, including playbooks for defining, reproducing, and managing project environments at scale.
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New tools like DeepSeek TUI show why local AI tooling is heating up: Users want fast, terminal-native harnesses for local and cloud models on NVIDIA CUDA and Apple Silicon. We show how Flox and Nix make the stack—models, servers, CLIs, envs—easier to run, build, and share. buff.ly/RcQlnml
Happy to say that I've been using Flox for a couple of weeks and so far (after some initial networking weirdness that wasn't Flox's fault) it's Just Worked. The rest of my team is still getting used to it, so it's possible we'll encounter new pain points in the future, but so far it's been great!
In financial services, today’s cutting-edge ML model becomes tomorrow’s baseline. Flox gives platform teams pinned, declarative GPU runtimes that travel from MacBooks to Slurm, CI, and Kubernetes—cutting runtime drift, image rebuild loops, and audit friction. Read the full article in the comments!
“Works on my machine” isn’t a joke. It means local dev has become shared infrastructure without being managed that way. Strict isolation is one path to reproducibility. Declared, locked environments are another: portable, verifiable, and better suited to local autonomy. full blog in the comments!
Flox | Standardized Development Environments Explained
Works-on-my-machine is symptomatic of an ongoing failure to treat the local development environment itself as shared project infrastructure. Standardized development environments are a compelling…
flox.dev
#PlanetNix 2026 throwback! Kelsey Hightower on discovering #Nix and realizing there was a fundamentally different way to think about software. buff.ly/9pzlu5c
RustWeek is almost here! Flox's Yannik Sander will be in Utrecht to learn, connect, and enjoy the program. Want to chat about Nix, reproducible dev environments, Rust workflows, or easier team setups? Ping him via yannik at flox dot dev; meetup time is limited b/c of talks.
fellow.ai used Flox to standardize reproducible environments across dev → CI → prod. The impact: ✔️ Faster engineer onboarding ✔️ Higher developer velocity ✔️ Fewer fire drills ✔️ Less rework ✔️ Reduced release risk Case study in comments.
Found a new use for @flox.dev today - was able to reproduce a bug involving communication between Ceph clients of two different versions. Before flox I probably would have set up 2 VMs with different versions of the packages installed but instead I was able to just run my tests from 2 flox envs
Security teams are often asked to certify where they can only infer. Scans, SBOMs, attestations, tickets, approvals; no confident answer to: do we know what’s running and how it got there? Secure software by construction starts with versioned, auditable runtimes. buff.ly/YxdymBY
Flox | Secure Software by Construction
Flox provides deterministic foundations for probabilistic workflows, so AI-driven velocity doesn’t come at the cost of stability, security, or compliance.
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Package managers, containers, environments… these often get conflated. We published a guide unpacking where package managers help, where they fall short, and why reproducibility across the SDLC is still unsolved for many teams. Learn more on the blog:
Flox | Package Managers and Package Management: A Guide for the Perplexed
The most important problem in packaging is how to efficiently, reliably, and securely packaging and distributing software so builds are deterministic and runs are portable and reproducible
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CVE remediation is a dependency-graph problem. Scanning attempts to infer from built artifacts. Flox/Nix derive artifacts + runtimes from the causal dependency graph. Remediation = dbms lookup + declarative edit: identify artifacts/envs, pin a replacement ref, promote. Read more in the comments!
Flox | Achieving CVE Remediation in an Era of Escalating Vulnerabilities
AI is accelerating the rate of CVE discovery. Learn how Flox and Nix transform package vulnerability triage from repeated artifact scans into quick, queryable dependency-graph analysis.
flox.dev
It’s not containers vs Flox. It can be Flox for languages and dev environments, containers for services, and the same environment reused in CI. New guide on the blog: buff.ly/et5t5eJ @rok-garbas.bsky.social at Flox cut a video that walks through this - link in the comments!
Flox | Flox and Containers: A Perfect Pattern for Local Development
Learn how to pair Flox with containers for local development: Flox provides the project runtime on the host, while containers run supporting services like PostgreSQL.
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