日本刀と美術刀剣の専門店
Seiyudo (seiyudo.com) scores 64 out of 100 on Brand Analyzer, placing it in the Developing tier among E-commerce brands, Other brands, in the 12th percentile of 27364 E-commerce brands.
Seiyudo is a Japanese art-sword dealer based in Ginza, Tokyo, specializing in the sale, purchase, and appraisal of Japanese swords (nihonto), armor (katchu/yoroi), sword fittings (tosogu), and related antique martial items. The company operates a large showroom displaying over 200 swords along with armor and fittings, and has more than a decade of experience in online sales. It serves collectors, enthusiasts, and heirs seeking to buy, sell, or have inherited items appraised. The store is located near JR Yurakucho Station.
| Brand Name | Seiyudo |
|---|---|
| Domain | seiyudo.com |
| Industry | E-commerce, Other |
| Headquarters | Ginza, Tokyo, Japan |
| Main Competitors | Aoi Art (70/100), Nipponto (42/100), Japanese Sword Shop, Unique Japan (73/100), Touken Komachi |
Moz Domain Authority 30/100 vs category average 40 / leader 95 - limited third-party links, so AI systems rarely encounter mentions of the brand.
Ranked #4,197,861 on the Tranco list of most-visited sites - modest traffic makes the brand easy for AI models to overlook.
No Wikipedia presence was found - a major gap, since Wikipedia is among the most heavily weighted sources in AI training data.
The homepage meta description reads "日本刀・刀剣の販売と買取なら、美術日本刀専門店・銀座誠友堂にご相談下さい。甲冑・鎧・鍔・刀装具・古武具類の販売、相続査定、委託販売、買取も承っております。銀座店では日本刀200振以上と小道具多数、甲冑・鎧を展示、販売しております。JR有楽町駅前徒歩1分です。" (Meta description too short (1 words). No OG description (falling back to meta)) - this is the summary AI engines are most likely to quote.
Structured data on the homepage: 2 JSON-LD block(s), Organization schema, Breadcrumb/Website schema, canonical. Adding FAQ schema would further help AI crawlers parse the brand's identity.
AI-crawler access: robots.txt present, no AI bot restrictions - robots.txt controls whether engines like GPTBot and ClaudeBot can read the site at all.
Content is JA-only, limiting citation in English-language AI answers.
Detected tech stack: Nginx.
Social footprint: verified profiles on X (Twitter), Instagram; no detected presence on Facebook, LinkedIn, YouTube, GitHub - consistent profiles reinforce the brand's identity across the web.
0 Reddit mentions - community discussion signals real-world reputation to AI models.
Live results from asking a general-purpose AI assistant about the brand, checked October 2026.
When asked "What is Seiyudo?", Claude could not identify the brand as of October 2026. I don't genuinely recognize Seiyudo, likely because it's a niche or smaller e-commerce company without significant presence in my training data.
When asked "Best brands similar to Seiyudo?", Claude would not surface Seiyudo as of October 2026. I can't recommend it since I don't have verified knowledge of what it offers or how it compares to other brands.
Common questions people ask in Google, ChatGPT, Claude, Gemini, Perplexity, and other AI search engines.
Seiyudo's main competitors in E-commerce: Aoi Art (70/100), Nipponto (42/100), Unique Japan (73/100).
Sources: Brand Analyzer scan
Seiyudo offers Japanese swords (nihonto), armor and helmets (katchu/yoroi), sword guards (tsuba), sword fittings (tosogu), and other antique martial artifacts (kobudogu). Services include retail sales, buybacks/purchasing of swords and related items, appraisal for inheritance purposes (sozoku satei), and consignment sales (itaku hanbai).
Sources: Seiyudo official site
Seiyudo has limited AI-search visibility, scoring 26/100 on Brand Analyzer's AI visibility composite (visibility 0, trust 42, recommendation 54). This estimates how likely AI engines like ChatGPT, Claude, Gemini and Perplexity are to know, trust, and recommend the brand.
Sources: Seiyudo official site
Seiyudo sells and buys Japanese swords, armor, and sword fittings, and provides appraisal services for inherited collections. It displays over 200 swords along with armor and small accessories in its Ginza showroom, and also offers consignment sales. The company has over a decade of experience selling these items online, supported by high-resolution photography for remote buyers.
Sources: Seiyudo official site
Seiyudo scores 54/100 on Brand Analyzer's AI recommendation signal, indicating it is reasonably likely to be surfaced when AI assistants like ChatGPT suggest E-commerce options. Recommendation depends on crawlability, structured data, and category authority.
Sources: Seiyudo official site
Seiyudo is a Japanese art-sword and antique arms specialty store located in Ginza, Tokyo. It focuses on the sale, purchase, and appraisal of Japanese swords (nihonto), armor (katchu/yoroi), sword fittings (tosogu), and other antique martial items. The business combines a physical showroom with online sales, catering to collectors, enthusiasts, and heirs of such items.
Sources: Seiyudo official site
Seiyudo can improve AI discoverability by strengthening structured data (Organization and FAQ schema), maintaining an accurate Wikipedia/Wikidata entity, earning authoritative citations, and keeping content crawlable for AI bots. Brand Analyzer measures these as visibility, trust, and recommendation signals.
Sources: Seiyudo official site
Seiyudo is known for operating one of the largest physical showrooms for Japanese swords in the country, displaying more than 200 swords alongside armor and sword fittings. It is also recognized for its long-standing online sales operation, which has been active for over ten years, supported by detailed high-quality photographs of items for sale.
Sources: Seiyudo official site
Seiyudo's customers include collectors and enthusiasts of Japanese swords, armor, and related artifacts, as well as individuals who have inherited such items and need appraisal or sale services. Its clientele spans both local, in-store shoppers in Ginza and online buyers worldwide who rely on its photographic documentation for remote purchases.
Sources: Seiyudo official site
Seiyudo scores 26/100 for AI visibility - how well ChatGPT, Claude, Perplexity and Google AI Overviews can discover, identify and cite the brand.
Seiyudo has a weak AI-visibility profile at 26/100 - a proxy for how readily ChatGPT, Perplexity and Google's AI Overviews can recognise and cite it. Its strongest area is recommendation likelihood (54/100) and its weakest is visibility (0/100). It benefits from a global traffic rank of #4,197,861 (Tranco), open access for AI crawlers (GPTBot, ClaudeBot, etc.) and machine-readable schema.org markup. The main gaps holding it back: no clear Wikipedia entity to anchor it in LLM training data, no strong Wikidata entry and a low Moz Domain Authority of 30/100. In a live check (October 2026), Claude could not identify Seiyudo from memory, confirming the gaps above.
The score combines seven dimensions - name quality, digital presence, visual identity, messaging clarity, trust foundation, AI discoverability, and brand authority - into a single objective benchmark.
Ranked closest to Seiyudo: Scrubstar (64/100), Scotch Brand (64/100), HugeDomains (64/100), Serpac (64/100).
A step up - brands to learn from: Zypp Electric (71/100), Zoologist Perfumes (71/100).
Category leader: DHL (97/100).
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