Kaigi on Rails 2026
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 features keynotes by Rails creator DHH and "The Pragmatic Programmer" author Dave Thomas, continuing its hybrid format with several hundred on-site attendees.
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
- 2020 コロナ禍によりYouTube Liveでオンライン初開催（同時視聴約230名）
- 2023 初のオフライン開催を実現しハイブリッド形式へ移行
- 2024 有明セントラルタワーホールで開催、現地参加692名と前年比約1.9倍に拡大
- 2025 JPタワー ホール＆カンファレンスで開催、基調講演に諸橋恭介・Samuel Williams
- 2026 ベルサール渋谷ガーデンで開催予定、DHHとDave Thomasが基調講演に決定
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)
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