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Kaigi on Rails 2026

Kaigi on Rails 2026
Date 2026.10.16 – 10.17 Day 1 11:00–18:30 / Day 2 10:00–18:15
Venue Bellesalle Shibuya Garden
Fee From ¥3,000 (4 tiers)
Register on the official site

Overview

Japan's largest conference for Ruby on Rails users, positioned as "a web technology conference enjoyable for everyone from beginners to experts" with a strong focus on practical, production-grounded sessions. The 2026 edition runs two keynotes — Ruby creator Yukihiro Matsumoto on day one and Rails creator DHH on day two. It continues its hybrid format with several hundred on-site attendees.

Program

  • Two tracks (Magenta Hall and Lime Hall) with 32 regular sessions
  • Two keynotes: DHH on Day 1 and Yukihiro Matz Matsumoto on Day 2
  • Six sponsor lightning talks at the start of each day
  • Official party after Day 2 (18:30-20:30, separate ticket)
  • Hybrid event, on-site and online

Speakers

  • Yukihiro Matsumoto (creator of Ruby, 2026 keynote)
  • David Heinemeier Hansson (creator of Ruby on Rails, 2026 keynote)

Speakers from past editions

  • Kyosuke Morohashi (2025 keynote)
  • Samuel Williams (Ruby committer, 2025 keynote)

Foundation

Founded
2020
Founder
Founded by community volunteers led by chief organizer Masafumi Okura as a venue for Rails practitioners, distinct from RubyKaigi

Born in 2020 during the COVID-19 pandemic as a YouTube Live online event, driven by the conviction that pausing would make a future restart impossible.

Transition

  1. 2020 First edition held online on YouTube Live due to the COVID-19 pandemic (about 230 concurrent viewers)
  2. 2023 First offline edition, shifting to a hybrid format
  3. 2024 Held at Ariake Central Tower Hall with 692 on-site attendees, about 1.9 times the previous year
  4. 2025 Held at JP Tower Hall & Conference with keynotes by Kyosuke Morohashi and Samuel Williams
  5. 2026 At Bellesalle Shibuya Garden with two keynotes, by Yukihiro Matsumoto and DHH

Voices

Beyond the sessions themselves, the real value of attending on-site lies in hallway conversations and sponsor booths.
Even as a new-grad engineer, I brought home insights directly applicable to production work.
The conference where you can feel the energy of the Rails practitioner community the most.
Learned from an AI-testing session how semantic HTML shapes AI testability (from Sotaro Fujimaki's report, in Japanese)
Staffed a sponsor booth, connecting with engineers and bonding as a team (from okakee's report, in Japanese)

In the News

Sponsors

Ruby Sponsors

Gold Sponsors

Silver Sponsors

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