Lockstep — find race conditions in BEAM code and replay them on demand

Lockstep is a concurrency test runner for the BEAM. You write what looks like an ExUnit test; it runs many times under controlled scheduling, and when it finds a race it gives you the exact schedule to replay.

Real bugs surfaced building it: Phoenix.Tracker pre-fc5686f, NimblePool pre-e18f45f, Hammer’s Atomic.FixWindow.inc/4.

Features:

• 5 scheduling strategies + trace replay + counterexample shrinking
• Drop-in OTP wrappers (GenServer, Task, Registry, Supervisor, ETS, Atomics, …)
• AST rewriters for Elixir + Erlang — works on unmodified upstream source
• Multi-node Lockstep.Cluster with partition / heal
• Optional Anthropic Claude integration to explain failing traces

https://github.com/b-erdem/lockstep

TelegramEx – make Telegram bots with ease

Built telegram_ex to make Telegram bot development in Elixir less painful.

Macro-based API handles boilerplate for you.

Features:

• Text, photos, documents, stickers, video
• Inline & reply keyboards
• Stateful FSM with routers
• And more…

Would be appreciate your feedback!

https://github.com/lsdrfrx/telegram_ex

Hologram UI waiting list is open - what components should ship first?

Hologram UI waiting list is now open - the official component library for Hologram, the full-stack Elixir framework that compiles Elixir to run in the browser. The case for a maintained library in the LLM era: components need accessibility, responsive design, and consistency across the set - not just markup. https://hologram.page/ui

Designing a Broker-Agnostic API Layer in Elixir

Four Elixir behaviours — Broker, BrokerAdapter, AccountManager, MarketDataSource — keep broker-specific quirks out of the trading pipeline entirely; this post covers the dispatch mechanism, how partial implementations are handled, and two design decisions worth revisiting.

ElixirCasts 205: Deploy Phoenix to a VPS

Ever wanted to deploy your Elixir apps to a VPS?

In episode 205, we use Tidewave to build a Phoenix app and Potions to deploy it to a VPS we own.

https://elixircasts.io/deploy-phoenix-to-a-vps-in-minutes-205

Thinking Elixir 302: BEAM in Your Pocket

Episode 302 of Thinking Elixir. News includes Mob, an exciting new framework that brings BEAM-on-device mobile development to Elixir with OTP running natively inside iOS and Android apps, Folio a new library for generating print-quality PDFs and SVGs from Elixir data powered by Typst via Rustler NIF, both Oban v2.22 and Oban Pro v1.7.0 were released with a host of improvements including job querying, unique workflows, and a rate limiting overhaul, LiveVue v1.1 arrives with Node-less SSR via QuickBeam and persistent layouts, erlang_quic v1.3.0 brings a production-ready pure-Erlang QUIC and HTTP/3 stack to OTP 27, and more!

https://www.youtube.com/watch?v=iQCElquebAo

ExRatatui Update

Elm-style reducer runtime, new widgets (Chart, Canvas, Calendar, Sparkline, BarChart) and a Widget protocol, SSH and distribution-attach transports, telemetry, guides, and Livebook integration via kino_ex_ratatui. Would love to hear feedback and what you build with it.

Repo & Docs.

Error Tracker v0.9 has been released

We have just released a new version of ErrorTracker, the Elixir based built-in error tracker. This version adds a few improvements related to Telemetry events:

• Include the Occurrence in :error Telemetry events
• Propagate muted flag to :error Telemetry events
• Improve sensitive header redaction
• Switch the codebase from Credo to Styler
• Fix compilation warnings under the upcoming Elixir 1.20

Take a look at the GitHub repository and the Hex.pm package for the detailed release notes and documentation.

Self-hostable Ngrok clone in Elixir

A (simple) clone of Ngrok using Elixir. Inspiration after reading ‘Network Programming in Elixir’ and general curiosity gave me the idea. Binary pattern matching, network protocols, a little Rust client made this a joy to build.

https://github.com/m1dnight/ferri

Thinking Elixir 301: Testing, Debugging, and Departures

Episode 301 of Thinking Elixir. News includes Phoenix LiveDebugger hitting v1.0 with an interactive tour to go along with it, LiveStash v0.2.0 shipping with API improvements and a tease of Redis & Mnesia adapters on the horizon, German Velasco making his TestingLiveView.com course completely free for the Elixir community, Volt reaching v0.8.0 as an Elixir-native frontend build tool that eliminates the need for Node.js, and Francesco Cesarini announcing his departure from Erlang Solutions while pledging to remain active in the Erlang Ecosystem Foundation, and more!

https://www.youtube.com/watch?v=rO-y4ELOOZs

The Broker Evaluation Gauntlet: Four Futures APIs Compared

A production comparison of four broker APIs — covering OAuth flows, streaming protocols (SSE vs WebSocket), symbol conventions, and order execution reliability — from an Elixir system that integrated them all and removed one.
https://seriousalchemy.com/broker-evaluation-gauntlet

Thinking Elixir 300: Celebrating 300 with José Valim

Episode 300 of Thinking Elixir. It’s Episode 300 — a milestone just under 6 years in the making! To celebrate, we kick things off with a fun song, then dive into the news: the Localize library v0.15.0 brings locale-aware formatting and Unicode CLDR data to Elixir without any compile-time code generation, a new library called Reach builds program dependence graphs for Elixir and Erlang to help coding agents and static analysis tools understand your codebase, Tidewave gets exciting updates including voice input with click-to-add context and the ability to install it as a PWA, the ErlEF has opened its 2026 board elections with voting running May 8-15, and more! Then we sit down with José Valim for an in-depth interview covering Elixir v1.20, the latest progress on the set-theoretic type system, the story behind Tidewave, and how AI is — and isn’t — changing development on Elixir itself.

https://www.youtube.com/watch?v=m5DVazRVcXM

Curiosum at the ElixirConf

Hi everyone!

We’re coming to #elixirconfeu with three talks from our team, so sharing the schedule here in case any of these topics are on your radar.

Thursday 23rd, 14:55 Jakub Lambrych

Hooked on Widgets: A Better Pattern for Reusable LiveView Components

👉 https://www.elixirconf.eu/participants/jakub-lambrych/

Friday 24th, 11:55 Bart Blast

Hologram: The Journey to Local-First Elixir in the Browser

👉 https://www.elixirconf.eu/talks/hologram-the-journey-to-local-first-elixir-in-the-browser/

Friday 24th, 11:55 Marta Habdas

Testing concurrency and fault tolerance in Elixir/Nerves on a real-world audiovisual sensor network

👉 https://www.elixirconf.eu/participants/marta-habdas/

Jakub and Marta also published articles around the ideas behind their talks, so there’s some extra reading before the conference. 😏

👉 https://curiosum.com/blog/making-sound-with-embedded-elixir-using-nerves

👉 https://curiosum.com/blog/hooking-up-with-liveview-stateful-widgets-with-function-components

And if you’re going to ElixirConf, come by our stand and say hi. Happy to talk Hologram, LiveView, Nerves, local-first, or just Elixir in general.

Scotty, I need warp speed in three minutes

My journey into optimising Elixir codebase of Ultravisor (my fork of Supabase’s Supavisor).

This story is not about a goal, but friends optimisations we met along the way.

https://hauleth.dev/post/things-about-elixir-you-probably-will-never-need/

Thinking Elixir 299: Don't Paste That Into Your Terminal

Episode 299 of Thinking Elixir. The Erlang Ecosystem Foundation is seeking community support for a major grant to fund the Ægis security project and the deadline is April 17th to show support, Hex.pm published the results of its first-ever comprehensive third-party security audit revealing three high-severity findings that have since been fixed, José Valim unveils a massive Tidewave update including UI Variants and a new “vision” mode that lets your coding agent take screenshots and record videos of your web app, Hex.pm gains the ability to serve llms.txt files for Elixir and Erlang packages, Remote releases a new Elixir LSP called Dexter written in Go, Lotus gets significant updates as an embeddable BI engine for Phoenix apps, Ghostty terminal emulator bindings land in Elixir bringing GenServer-based terminals to LiveView, and we discuss the alarming ClickFix supply chain attack that compromised Axios and what it means for open source maintainers everywhere, and more!

https://www.youtube.com/watch?v=S_ghKzzBWAk

Latest Webinar: How to Build Systems That Stay Online When Everything Spikes

Erlang Solutions is back with another webinar, How to Build Systems That Stay Online When Everything Spikes by Camjar Djoweini 🚀

Camjar explores what is happening inside systems under pressure and what it takes to keep them stable.

👉 You can check it out here: https://www.erlang-solutions.com/webinars/how-to-build-systems-that-stay-online-when-everything-spikes/

🚨 Last call for ElixirConf EU 2026!

Join us next week in Málaga 🇪🇸 or attend virtually 🎥 40+ talks, 3 keynotes, and major reveals from the Elixir core team.

🎟️ Tickets cheaper until April 16 - don’t miss out! https://www.elixirconf.eu/#register

Creating the arcade game Grand Piano Keys with Nerves - Hassan Shaikley | NervesConf US

https://youtu.be/x5f7SU5_Xjw

Grephql - Compile-time GraphQL client with typed Ecto schemas

Grephql is a compile-time GraphQL client for Elixir. It validates queries against your schema during compilation, generates typed Ecto embedded schemas for responses, and provides generated variable/input modules with changeset validation. It supports fragments, unions, interfaces, aliases, Req integration, and a ~GQL formatter plugin. Docs, source, and examples: https://github.com/fahchen/grephql

Securing Hex, the Backbone of the Elixir Ecosystem

Paraxial.io’s security audit of Hex, funded by Alpha-Omega and conducted under the EEF’s Ægis Initiative, found and fixed an RCE vulnerability in the Hex Elixir client and confirmed the ecosystem’s overall robustness against supply chain attacks. Hex is more secure now than ever before!

https://paraxial.io/blog/hex-pentest