It reads as SuperIntelligence
A name like rapid.si or essai.si reads as one brand: the word plus SI. The extension does the positioning work that .ai did for the last generation of AI startups.
16 premium domains available now
Short, brandable .si domains for what you build next.
Premium .si domains for sale at fixed prices. .si reads as SuperIntelligence: short, brandable names for AI companies. Pay through Escrow.com and get the transfer code within 24 hours.
- Escrow.com protected
- No buyer fees
- EPP code in 24 h
- Domains for sale
- 16
- Fixed prices
- €700–€6,000
- Shortest name
- mkr.si
- Buyer fees
- €0
- Transfer code
- within 24 h
Featured
Short names. Rare finds.
- AI 5 chars essai.si "Essai" means attempt or essay in French — with both AI and SI built right into the name. €6,000
- Short 3 chars mkr.si "MKR" is shorthand for maker — read with .si, it says makers of superintelligence. €4,500
- AI search 4 chars llmo.si "LLMO" stands for large language model optimization — the SEO of the AI era. €2,000
Portfolio
All domains
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€6,000 about $6,700
"Essai" means attempt or essay in French — with both AI and SI built right into the name.
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€4,500 about $5,050
"Human robots" says exactly what humanoid robotics is — no explanation needed.
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€4,500 about $5,050
"MKR" is shorthand for maker — read with .si, it says makers of superintelligence.
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€2,000 about $2,250
"LLMO" stands for large language model optimization — the SEO of the AI era.
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€1,500 about $1,700
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€1,500 about $1,700
"NVision" sounds like envision — a brand you can say out loud and spell from memory.
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€1,500 about $1,700
Four letters with authority already built — hundreds of existing links, including from Slovenian government and university websit…
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€1,200 about $1,350
"NetServer" puts network and server in one word — instantly understood by every IT buyer.
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€1,200 about $1,350
"NVQ" is the established UK name for vocational qualifications — instantly familiar to learners, trainers and employers.
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€900 about $1,000
"Aps plus" reads as apps, plus intelligence — friendly and easy to say.
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€900 about $1,000
"Kyber" is the post-quantum encryption standard chosen by NIST — instantly recognized in security circles.
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€900 about $1,000
"n-3" is the scientific notation for omega-3 fatty acids, used across nutrition research.
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€900 about $1,000
"NQF" stands for National Qualifications Framework — the system many countries use to define education and skill levels.
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€750 about $840
Three letters, short and easy to say in any language — a clean acronym ready to become your brand.
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€750 about $840
Three letters, short and easy to say in any language — a clean acronym ready to become your brand.
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€700 about $780
"Mind portal" evokes a gateway between people and intelligent machines — exactly where superintelligence is heading.
Why .si
Why .si domains work for AI brands
.si is the country-code domain of Slovenia, run by the Register.si registry. AI companies read it as SuperIntelligence, the same way .ai is read as artificial intelligence. Short, meaningful .si names are still available, at a fraction of what comparable .ai names cost.
Open to companies worldwide
Individuals and companies from any country can hold a .si domain. You do not need a Slovenian address, a local company or a representative.
Short names still exist
Three- and four-letter .si names and single dictionary words are still on the market, while comparable .com and .ai names are long gone or priced far higher.
| Feature | .com | .ai | .si |
|---|---|---|---|
| Type | Generic | Country code | Country code |
| Country | — | Anguilla | Slovenia |
| Registry | Verisign | Government of Anguilla | Register.si (ARNES) |
| Reads as | Commercial | Artificial intelligence | SuperIntelligence |
| Short names available | Almost none | Scarce, high prices | Still available |
How it works
From checkout to ownership in about a day.
Your money sits with Escrow.com until the domain is registered in your name. We only get paid once you have it.
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Pick a domain
Buy at the listed price or send an offer. Every serious offer gets a reply within 24 hours.
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Pay via Escrow.com
Card or bank transfer. Your funds are held by Escrow.com — not by us.
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Get the transfer code
We send the EPP (auth) code within 24 hours. Move the domain to any registrar you like.
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Funds released
Once you confirm ownership, Escrow.com pays the seller. Done.
Journal
Notes on names and .si domains
Technological singularity: what it means and who predicts it
A clear explainer of the technological singularity: where the idea comes from, its three meanings, Kurzweil's 2029 and 2045 dates, and who supports or doubts it. It closes with what the latest survey of AI researchers actually shows.
Reflection AI: the open frontier lab, its funding and models
A sourced profile of Reflection AI: who founded it, how its mission changed, what it has shipped and how its valuation reached $25 billion pre-money. It also covers where its promised open model stands as of October 2026.
Thinking Machines Lab: what Mira Murati’s AI company builds
A sourced profile of Thinking Machines Lab, Mira Murati's AI company: what Tinker and Inkling do, how much it has raised, who has left and whether you can invest.
What does .si stand for?
.si is the country-code top-level domain of Slovenia, managed by the Register.si registry. AI companies read it as SuperIntelligence, the way .ai is read as artificial intelligence, which makes short .si names attractive for AI brands.
Is buying through Escrow.com safe?
Yes. Escrow.com is a licensed escrow service used for domain sales since 1999. Your payment is held until the domain is transferred to you; if the transfer fails, you get your money back.
What happens after I click "Buy now"?
You are taken to Escrow.com with the domain and price already filled in. You pay by card or bank transfer, Escrow.com holds the funds, we send the transfer (EPP) code within 24 hours, and the money is released only after the domain is registered in your name.
How long does a .si domain transfer take?
Usually about a day. Once Escrow.com confirms your payment, we send the EPP (auth) code within 24 hours; the transfer at your registrar is typically completed shortly after you submit the code.
How does a .si transfer work?
After payment, we send you the EPP (auth) code. You start the transfer at any accredited .si registrar and the domain is registered in your name. We help at every step.
Who pays the escrow fee?
We do. You pay only the listed price — there are no buyer fees.
Can I make an offer below the listed price?
Yes. Every domain page has a "Make an offer" option. We review all serious offers and reply within 24 hours.
Can non-Slovenian companies own a .si domain?
Yes. .si domains can be registered by individuals and companies from any country, without a local address.
Why choose a .si domain for an AI company?
.si reads as SuperIntelligence, the way .ai reads as artificial intelligence. A short .si name signals an AI-first brand while staying a stable, well-run country-code domain.
Looking for a name we haven't listed?
Part of our portfolio is off-market. Tell us what you need and we'll check.