What powers isucon.net?
Last seen May 2026 · 21 technologies across 17 categories
Advertising
Twitter Ads
since Jul 2021
Analytics
Adjust
since Aug 2024
Google Analytics
since Apr 2019
CDN
Amazon CloudFront
since Sep 2020
Cloudflare
since Mar 2025
Font scripts
Google Font API
since Sep 2020
Hosting
Sakura Internet
since Feb 2026
Issue trackers
Sentry
since Sep 2020
JavaScript frameworks
React
since Sep 2021
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
Webpack
since Sep 2020
PaaS
Amazon Web Services
since Sep 2020
Programming languages
Ruby
since Sep 2020
RUM
New Relic
since Oct 2024
Security
Cloudflare Bot Management
since Mar 2025
Tag managers
Google Tag Manager
since Jul 2020
Web frameworks
Ruby on Rails
since Sep 2020
Web servers
Nginx
since Aug 2020
Widgets
Twitter
since Apr 2019
Audience
- 100% desktop
Japan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
4.69 / 10 · ranked #323,764 of all domains
148 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Jun 2026.
Subdomains
| Host | Techs |
|---|---|
| isucon.net | 11 |
| portal.isucon.net | 11 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Cloudflare May 2026
- detected Cloudflare Bot Management May 2026
- detected Sakura Internet Feb 2026
- dropped Cloudflare Nov 2025
- dropped Cloudflare Bot Management Nov 2025