Skip to content
Effect 4.0 is here. One ecosystem. Zero dependencies.

// Livorno, Italy · Dec 9–11, 2026

Effect Days

For Effect and TypeScript engineers: three days of workshops, talks, and community.

Sold out
The Effect community at Effect Days 2025 in Livorno

// Effect Days 2025 · Livorno

// The Program

The Effect Days experience

A community-driven, non-profit event celebrating the Effect ecosystem.

01
Wed · Dec 9

Effect Workshop

Full-day sessions led by Effect experts.

02
Thu · Dec 10

Effect Conference

Engaging talks, afterparty & swags!

03
Fri · Dec 11

Community Day

More learning, networking, and fun!

// Speakers

Who you'll hear from

Builders, maintainers and educators shipping with Effect, from Cloudflare and Warp to OpenCode and Alchemy.

Kit Langton

Kit Langton

OpenCode

MC & speaker

Built Visual Effect to watch fibers misbehave and the Effect Institute to explain why. Then moved OpenCode to Effect, and hasn't typed a line of code since.

Adam Rankin

Adam Rankin

Warp

Rhys Sullivan

Rhys Sullivan

Executor

Dillon Mulroy

Dillon Mulroy

Cloudflare

Sam Goodwin

Sam Goodwin

Alchemy

Devin Jameson

Devin Jameson

Foldkit

John A. De Goes

John A. De Goes

Ziverge

Michael Arnaldi

Michael Arnaldi

Effectful Technologies

Maximilian Schwarzmüller

Maximilian Schwarzmüller

Academind

Julia Ortiz

Julia Ortiz

silklang.org

Leonie Gräßel

Leonie Gräßel

Novelcrafter

Julius Marminge

Julius Marminge

T3 Code

Kyle Mistele

Kyle Mistele

HumanLayer

// Sponsors

Made possible by

Become a sponsor

Main

Effectful Ziverge Warp

Partners

Betalyra Inato Cloudflare Datapizza

Community

Novelcrafter Executor August Academind

// The Venue

Palazzo Pancaldi, Livorno

A beautiful seaside location in the Tuscan riviera, where you can enjoy good food and the coastal views.

About Livorno View on map
Palazzo Pancaldi on the Livorno seafront
The conference hall at Palazzo Pancaldi Livorno's harborfront seen from the water Boats on a canal in Livorno's Venezia Nuova district Canal-side buildings and boats in Livorno

// Only 100 tickets

Choose your pass

Sold out

Workshop, Conference & Community Pass

Dec 9 Workshop Day
Dec 10 Conference Day
Dec 11 Community Day
Sold out
Sold out

Conference & Community Pass

Dec 9 Workshop Day
Dec 10 Conference Day
Dec 11 Community Day
Sold out

// 3rd Edition

The journey continues

Effect Days 2024

Effect Days 2024
Vienna, Austria Feb 22-24

Where the Effect community gathered for the first time: 15 talks, 2 workshops.

Full playlist

Effect Days 2025

Effect Days 2025
Livorno, Italy Mar 19-21

Advanced use cases and real production stories: 19 talks, 2 workshops.

Full playlist

Effect Days 2026

Dec 9–11, 2026 ▊
Livorno, Italy Dec 9-11

The 3rd edition. Back to the Tuscan coast, and you're invited.

Be part of it

// FAQ

Frequently Asked Questions

Effect Days is a non-profit event dedicated to Effect, an open-source software library that offers an ecosystem of tools for building production-grade applications in TypeScript.

Effect Days will take place on December 9-11, 2026 at Palazzo Pancaldi, Viale Italia, 56, 57127 Livorno LI, Italy.

The conference schedule will be shared as we get closer to the event.

The conference talks will be recorded and published on the Effect YouTube channel a few weeks later. In the meantime you can subscribe to our YouTube, follow Effect on X (Twitter), or join the community to stay updated.

Effect Days isn't just about talks, it's about real connections. The Community Day on December 11th is a full day dedicated to deeper discussions, networking, and community activities.

Please refer to our Refund Policy for more details.

The closest airport is Pisa (PSA), about 30 minutes away by train or car. Florence (FLR) is roughly 90 minutes away. Livorno Centrale station has direct rail connections to both. See the nearest airports for details.

Yes. Effect Days is dedicated to providing a harassment-free experience for everyone. Please read our Code of Conduct.

// Dec 9–11, 2026 · Livorno, Italy

Enjoy Effect Days

Three days with the people building Effect and the people building with it.

Sold out