R3 Institute's 'gusuku Customine' Wins 'ITreview The Best Software in Japan' for 3rd Consecutive Year

R3 Institute (Headquarters: Osaka, Osaka Prefecture; Representative Director: Ken Nishimatsu; hereinafter "the Company") is pleased to announce that its service, gusuku Customine, has been selected for the TOP 100 in the "ITreview The Best Software in Japan 2026" hosted by ITcloud, Inc.

About ITreview The Best Software in Japan 2026

This award recognizes SaaS and software highly supported by users, based on real user reviews posted on ITreview, one of Japan's largest IT product comparison platforms. For the evaluation, approximately 158,000 reviews posted between April 2025 and March 2026 were analyzed based on the "ITreview Score," which combines indicators such as user satisfaction, ease of use, support quality, and market awareness to select the top 100 products regardless of industry or category.

Award Details for gusuku Customine

gusuku Customine was selected for the TOP 100, ranking 37th. This marks the third consecutive year that the service has received this award.

Furthermore, in the newly established "The Best Software by Category," it was selected as the No. 1 product in the kintone plugin category, having received high praise from users.

Reviews for gusuku Customine

As of May 2026, gusuku Customine holds a user satisfaction rating of 4.4.

It has received many high-rating reviews for its "satisfaction with functionality," featuring over 400 capabilities, as well as its "support quality," including chat and customer success interviews, and its "ease of use."

About gusuku Customine

gusuku Customine is a service that realizes kintone customizations—things users wish they could do—without coding. Users can create desired customizations by freely combining over 400 available "actions" with "conditions."

In 2021, in addition to kintone app customization, it added features such as Job Runner, which can handle batch processing and Webhooks, and functions to export data from kintone to Excel or PDF, making it a service that users say "works if you have Customine."

gusuku Customine boasts an overwhelming abundance of features for extending kintone functionality and has been frequently updated since its release in 2018.

As of May 2026, it has been adopted by over 2,500 companies, and the company continues to strive to be a service that users can say, "Things went well because we had gusuku Customine."