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C4J alternatives & similar sites

一般社団法人コード・フォー・ジャパン | Code for Japan — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Civic Affairs →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
code4japan.org ↗	85 match shared topic	一般社団法人コード・フォー・ジャパン \| Code for Japan	ja	civic-affairs	robotsllmsaihumans	emailphone	none
ossaj.org ↗	33 match shared topic	オープンソースソフトウェア協会 – OSSAJ : Open Source Software Association of Japan	ja	software-and-applications WordPress	robotsllmsaihumans	emailphone	none
opensource.jp ↗	33 match shared topic	Open Source Group Japan – オープンソース・グループ・ジャパン – オープンソースの定義、オープンソースに適合するライセンスの参考訳などを公開し、オープンソースの発展に寄与するために様々な活動を行っています	Japan ja	technology-and-computing WordPress	robotsllmsaihumans	emailphone	none
coderdojo.jp ↗	30 match shared topic	CoderDojo Japan - 子どものためのプログラミング道場	Japan ja	programming-languages	robotsllmsaihumans	emailphone	none
qiita.com ↗	28 match shared topic	Qiita	ja	technology-and-computing	robotsllmsaihumans	emailphone	none
codezine.jp ↗	29 match shared topic	CodeZine（コードジン）	Japan ja	technology-and-computing	robotsllmsaihumans	emailphone	none
madeinlocal.jp ↗	28 match shared topic	地方創生メディアはMade In Local	Japan ja	civic-affairs	robotsllmsaihumans	emailphone	none
townnews.co.jp ↗	28 match shared topic	タウンニュース \| 神奈川県全域・東京多摩地域の地域情報紙	Japan ja	civic-affairs	robotsllmsaihumans	emailphone	none
gihyo.jp ↗	28 match shared topic	gihyo.jp \| gihyo.jp	Japan ja	technology-and-computing	robotsllmsaihumans	emailphone	none
okinawatimes.co.jp ↗	28 match shared topic	沖縄タイムス＋プラス \| 沖縄の最新ニュースサイト \| 沖縄タイムス社 \| 沖縄タイムス＋プラス	Japan ja	civic-affairs	robotsllmsaihumans	emailphone	none
gizmodo.jp ↗	28 match shared topic	ギズモード・ジャパン \| "みんなで探求する"テックメディア	Japan ja	technology-and-computing	robotsllmsaihumans	emailphone	none
atmarkit.co.jp ↗	28 match shared topic	ITエキスパートのための問題解決メディア - ＠IT	Japan ja	technology-and-computing	robotsllmsaihumans	emailphone	none
gooddo.jp ↗	28 match shared topic	gooddo（グッドゥ）｜社会課題を知って、あなたにできる貢献を。いいこと、しやすく。	Japan ja	civic-affairs	robotsllmsaihumans	emailphone	none
homemate-research-police.com ↗	28 match shared topic	警察署検索／ホームメイト	ja	civic-affairs	robotsllmsaihumans	emailphone	partial · 8
ypr.co.jp ↗	28 match shared topic	株式会社吉田地図PRセンター	Japan ja	civic-affairs	robotsllmsaihumans	emailphone	none
e-words.jp ↗	28 match shared topic	IT用語辞典 e-Words	Japan ja	technology-and-computing	robotsllmsaihumans	emailphone	partial · 4
feedmeter.net ↗	28 match shared topic	フィードメーター -ブログの人気度と更新頻度を測定する無料サービス	ja	technology-and-computing	robotsllmsaihumans	emailphone	none
daily-tohoku.news ↗	28 match shared topic	デーリー東北	ja	civic-affairs	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.