.io is the country code of the British Indian Ocean Territory, but most buyers never think of it that way. To developers, "I/O" means input and output, and .io became the extension that technical startups chose when the .com was taken. Our corpus holds 1,431 recorded .io sales, a far smaller market than .com, which makes careful comp selection even more important. This page covers what moves .io prices and how to use comps for an .io name.
Who buys .io names
Developer tools and infrastructure companies are the core end users. APIs, databases, monitoring tools, deployment platforms and open source projects have used .io for years, and many keep it as their main brand.
SaaS and web3 projects adopted .io for the same signal, a technical product with a modern feel.
Browser and casual game studios use .io because a whole genre of multiplayer web games carries the extension in its name.
Investors trade .io names at investor venues such as Sav.com, Namecheap, Park.io and Dynadot, and across GoDaddy, which together carry a large share of recorded .io trading.
What drives .io prices
Short words and technical meaning
The strongest .io names are short dictionary words or technical terms that read as a product. The top of the recorded market shows this. mint.io sold for 230,000 USD (Park.io, 2021-11-18), fluid.io for 199,995 USD (Afternic, 2024-11-26) and thunder.io for 179,995 USD (Afternic, 2026-05-15). Each is a single, strong, brandable word.
Very short names and numbers
Single characters in .io have a small but active market. 7.io sold for 150,000 USD (Squadhelp, 2024-01-19) and 0.io for 125,000 USD (Private, 2024-01-21). These are scarcity plays, not meaning plays, and they are comps only for other very short .io names.
Fit with a technical product
A word that a developer tool would plausibly use (sync, deploy, queue, stream, signal) has a larger pool of potential buyers in .io than a word with no technical connection. The same word that is ordinary in .com can be attractive in .io because the buyer group is different.
The .com of the same word
Many .io buyers start on .io because the .com is too expensive or unavailable. When a company grows, it often buys the .com and may keep or sell the .io. That ceiling matters. An .io name rarely approaches the price of the same word in .com, and investors know it.
Questions about the extension
The 2024 announcement that the United Kingdom would transfer sovereignty of the Chagos Islands to Mauritius was widely reported, and some buyers asked what that might mean for .io in the long term. Registrations and renewals have continued. Whatever your view, it is one more reason to price .io names on recent recorded sales rather than on older ones.
Wholesale and retail in .io
The gap between investor and end-user prices can be wide in .io, because the end-user buyer pool is specific. freckle.io sold for 1,121 USD (Park.io, 2022-09-08) and later for 20,000 USD (Afternic, 2025-08-14). That is the investor case going right. Many other .io names bought at auction wait years for a buyer, and renewal costs for .io are higher than for a typical .com, which pushes investors to sell or drop weaker names.
For an .io name, decide whether you are estimating what an investor would bid or what a developer tools company might pay. Use investor venue comps for the first and end-user marketplace comps (Afternic, Sedo, Atom.com) for the second. GoDaddy, which handles a large share of .io trading, mixes both, so treat its prices with care.
How to use comps for an .io name
- Stay inside .io. The buyer pool is distinct. A .com sale of the same word is context, not a comp.
- Match length and type. Single words, two-word phrases, brandables and very short names are separate segments.
- Match the use. Compare technical words with technical words. A developer term is a better comp for another developer term than a random word that happens to share letters.
- Weight recent sales. With only 1,431 recorded .io sales, every comp counts, but a recent sale is still better evidence than a 2021 one.
- Accept wider ranges. In a thin market, three close comps may be all you get. That is fine, as long as the range reflects it. Our guide to domain comps explains how.
When there are no good comps
Many .io names will have few close recorded sales above 1,000 USD. That is information in itself. If nothing similar has been recorded above the floor, names like yours usually trade below it.
How SoldComparables handles .io names
SoldComparables treats .io as its own market. Comps from the same extension get a relevance boost and the reason "Same .io extension". Meaning comes from an embedding language model that has precomputed which words are close, so a name about message queues can find comps built on stream, pipeline or event words, which matters in a market this thin.
Each comp is scored from 0 to 100 with up to three plain reasons and shows its venue tier, date and a link to the public report. The estimate gives low, likely and high values, separate wholesale and retail figures, a confidence level and a rationale that cites comps by name, price and date. With fewer than three good comps, the report says so, widens the range and lowers confidence. It is a data-backed estimate, not a certified appraisal.
Compare with .ai domain sales and .co domain sales, or read how a single name moves over time in domain sales history.
Check your .io name on the domain appraisal tool, or see what each plan includes on the pricing page.