The two extensions almost every new tech startup wants, .ai and .io, are also the two that cost the most to own. They read well to founders and investors, which is exactly why the registries price them high and keep them there. If you are naming an AI product or a developer tool, here is what these extensions actually cost, why the renewal is the number that matters, and which registrar is cheaper for each.
Why .ai and .io cost so much
Neither extension is expensive by accident. Both are country-code domains that got adopted far outside their origin because the letters happen to mean something in tech. The registries behind them set a high wholesale price, and that price flows through to whatever registrar you use.
A couple of specifics drive the cost:
- .ai is the country code for Anguilla, and demand from AI companies has made it one of the priciest mainstream extensions. It has also often required registration in two-year blocks rather than one year, so the first bill is larger than you expect.
- .io is a country-code domain long treated as a generic startup extension. It is cheaper than .ai but still sits well above .com, and its renewals are high wherever you register.
Because the cost is mostly the registry’s, no registrar can make a .ai or .io genuinely cheap. What a good registrar can do is keep its own markup low, include WHOIS privacy free, and not bury you in upsells. That is where the choice between registrars actually matters.
The renewal is the real cost, even more here
On a normal extension, the gap between the first-year promo and the renewal stings a little. On .ai and .io, it stings a lot, because the base price is already high. A first-year discount on a .ai can look like a deal and then renew at full registry price every term after.
So judge these extensions over the years you will hold them. A startup keeps its primary domain for as long as the company exists, which means the renewal, paid again and again, dwarfs the first-year number. Compare renewals between registrars, not promos. The domain renewal price trap guide covers the math, and it applies double to expensive extensions.
Which registrar is cheaper for .ai
For a .ai domain, Dynadot is usually the cheaper of the mainstream registrars worth trusting, both at registration and renewal. Namecheap offers .ai too and is competitive, but Dynadot tends to edge it on this extension specifically.
Two things to check before you buy a .ai anywhere:
- The registration term. If the registrar is quoting a two-year minimum, make sure you are comparing two-year totals, not a one-year price against a two-year one.
- The renewal per term. This is the figure you will pay for as long as you keep the company. Confirm it on the registrar’s page, since the first-term price may be discounted.
A premium-flagged .ai can also cost far more than the standard rate, set by the registry rather than the registrar. It will show as available, so confirm the price before you celebrate finding a short name.
Which registrar is cheaper for .io
For .io, the two registrars are closer, with Dynadot often a little cheaper on both registration and renewal. Namecheap runs frequent promos that can win a given first year, so the cheaper option for your exact name depends on the day.
The decision usually comes down to the renewal again. A .io you keep for years is cheaper at whichever registrar has the lower renewal, even if the other had a better opening promo. Both include free WHOIS privacy, so that is not a tiebreaker here.
If you are weighing .io against .co or a plain .com, the .com vs .io vs .co guide breaks down when each one is worth it. The short version for a startup: get the .com if you can afford to protect the brand, and use .io or .ai as your public-facing domain if it fits the product.
A founder’s buying checklist for .ai and .io
Before you commit budget to an expensive extension:
- Check the name across extensions in the domain availability checker. It shows .ai, .io, .co and .com side by side, with the Namecheap and Dynadot price for each and the cheaper one marked.
- Compare the renewal, not the first term, at both registrars. On these extensions that gap is the whole decision.
- Watch for the .ai two-year minimum so you are comparing like for like.
- Grab the .com as well if it is free, even if you launch on .ai or .io, so a competitor cannot sit on the version people type by habit.
- If the name is taken or premium-priced, generate fresh alternatives with the brand name generator, which only surfaces names that are actually open across extensions.
A .ai or .io is worth paying for when the signal fits your product. Just pay for it with open eyes: pick the cheaper registrar for that specific extension, weigh the renewal over the life of the company, and lock the matching .com while you are there. Start by checking your name’s real price at both registrars in the free domain availability checker.
