Free Shell Access Since 1987
SDF (sdf.org) scores 73 out of 100 on Brand Analyzer, placing it in the Brand-Ready tier among Technology brands, Non-profit brands, Education brands, in the 34th percentile of 54219 Technology brands.
SDF (Super Dimension Fortress) is a nonprofit, member-supported organization that provides free and low-cost public access to UNIX systems and the Internet. Operating since 1987, it serves hobbyists, students, and technology enthusiasts who want shell accounts, command-line computing experience, and community-oriented online resources. SDF's mission centers on educational and community access to computing, positioning it as a long-standing advocate for open, affordable internet access rather than a commercial service provider.
| Brand Name | SDF |
|---|---|
| Domain | sdf.org |
| Industry | Technology, Non-profit |
| Founded | 1995 |
| Parent Company / Owner | French State |
| Main Competitors | The WELL, Tilde Club (76/100), Hashbang (66/100), Panix |
Ranked #25,262 on the Tranco list of most-visited sites - strong traffic reinforces the brand's prominence to AI models.
SDF has a dedicated Wikipedia entity - a top-weighted signal AI models rely on to identify and describe the brand.
The homepage meta description reads "To provide free and low-cost public access to UNIX systems and the Internet for educational and community purposes." (No meta description) - this is the summary AI engines are most likely to quote.
Structured data on the homepage: No structured data or Open Graph tags detected. Adding Organization and 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.
Detected tech stack: Apache.
Social footprint: verified profiles on X (Twitter), LinkedIn, Facebook, Instagram, 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 November 2026.
When asked "What is SDF?", Claude could identify the brand as of November 2026. SDF (Super Dimension Fortress) is a long-running public access Unix system and nonprofit organization that offers shell accounts, email, and various internet services for a membership fee or free tier, continuing a tradition of old-school timesharing Unix communities. Best known for being one of the oldest and most well-known public access Unix / shell account communities, running since the late 1980s.
When asked "Best brands similar to SDF?", Claude would recommend SDF as of November 2026. It's a notable, long-standing example in the niche of public access Unix systems and retro internet communities, so it's worth mentioning to anyone interested in that space.
Common questions people ask in Google, ChatGPT, Claude, Gemini, Perplexity, and other AI search engines.
SDF's main competitors in Technology: Tilde Club (76/100), Hashbang (66/100).
Sources: Brand Analyzer scan
SDF has limited AI-search visibility, scoring 42/100 on Brand Analyzer's AI visibility composite (visibility 67, trust 4, recommendation 44). This estimates how likely AI engines like ChatGPT, Claude, Gemini and Perplexity are to know, trust, and recommend the brand.
Sources: SDF official site
SDF was founded in 1995. SDF operates in the Technology category. It is analyzed by Brand Analyzer across seven brand dimensions and AI-search visibility.
Sources: Wikidata
SDF scores 44/100 on Brand Analyzer's AI recommendation signal, indicating it is less likely to be surfaced when AI assistants like ChatGPT suggest Technology options. Recommendation depends on crawlability, structured data, and category authority; a Wikipedia presence helps.
Sources: SDF official site
SDF 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: SDF official site
SDF is owned by or part of French State. SDF operates in the Technology category.
Sources: Wikidata
SDF (Super Dimension Fortress) is a nonprofit, member-supported public access UNIX system that has provided free and low-cost shell accounts and internet access since 1987. It is organized around educational and community goals rather than commercial ones, offering a long-running platform for hobbyists and enthusiasts to use UNIX-based command-line computing.
Sources: SDF official site
SDF provides free and low-cost public access to UNIX systems and the internet. It offers shell accounts that let users log into UNIX environments remotely, supporting educational exploration of command-line computing as well as community-based online activities such as email, forums, and other UNIX utilities.
Sources: SDF official site
SDF scores 42/100 for AI visibility - how well ChatGPT, Claude, Perplexity and Google AI Overviews can discover, identify and cite the brand.
SDF has a limited AI-visibility profile at 42/100 - a proxy for how readily ChatGPT, Perplexity and Google's AI Overviews can recognise and cite it. Its strongest area is visibility (67/100) and its weakest is trust (4/100). It benefits from a recognised Wikipedia company entity, a Wikidata knowledge-graph entry and a global traffic rank of #25,262 (Tranco). The main gaps holding it back: thin schema.org structured data and no llms.txt to steer AI to its best pages. In a live check, Claude could already identify SDF from memory (November 2026) - a sign these signals are paying off.
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 SDF: San Diego BOS Techs (73/100), Science (73/100), Seal Subscriptions (73/100), search.ch (73/100).
A step up - brands to learn from: Zymo Research (81/100), Zurich Italia (81/100).
Category leader: Hostinger (97/100).
Brand Analyzer is built by DataEase AI. Track your brand in ChatGPT, Gemini and Perplexity.