ISUCON2026
Overview
A team-based contest in which participants tune a given web application for speed within a fixed time limit. The name stands for "Iikanjini Speedup Contest"; 14 editions have been held since the first in 2011. 2026 is the first year under a new structure, with Sakura Internet taking over the operations desk from LY Corporation, run as an online and offline hybrid with 935 slots opened in three waves.
Foundation
- Founded
- 2011
- Founder
- First held in 2011 by the technology division of livedoor, now LY Corporation
First held on 27 August 2011 at Shinjuku L Tower by the technology division of livedoor, as a web application performance tuning contest. LINE and later LY Corporation supported it across 14 editions. In December 2025 the event support structure was handed over from LY Corporation to Sakura Internet, and the 2026 edition runs under the theme "Second Stage" with teams of one to three, split into open and student divisions.
Transition
- 2011 First edition held August 27 at Shinjuku L Tower, hosted by livedoor
- 2024 ISUCON14 held in December with an eight-hour contest on AWS
- 2025 On December 23, the handover of the event support structure from LY Corporation to SAKURA internet is announced
- 2026 Held October 31 as the first year under the new structure, under the theme Second Stage: Unchanging Passion, New Challenges
Voices
A solo first-timer called it a mixed-martial-arts test of web application knowledge and enormously fun, noting you learn simply by competing and learn even more by reviewing afterwards (from an ISUCON14 participant's diary, in Japanese)
A first-time team finished 344th of 831 and hit their top-50% goal, reflecting that practice problems had felt discouraging but they stayed calm on the day, which proved how much preparation matters (from Nifty Lifestyle's report, in Japanese)
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