Cheapest .io Domain Registrars Compared

Looking for the cheapest .io domain? The .io extension has become one of the most popular domain choices for tech startups, SaaS products, and developer tools. Originally the country-code domain for the British Indian Ocean Territory, it has been widely adopted by the tech community as a recognizable brand signal. While first-year registration prices can look appealing, renewal fees for .io domains tend to be significantly higher than most other extensions — making it crucial to pick the right registrar from the start.

What is a .io domain?

A .io domain is technically a country-code top-level domain (ccTLD) originally assigned to the British Indian Ocean Territory. However, much like cheap .co.uk domains, it has evolved well beyond its geographic origins and is now widely used across the globe, particularly in the tech industry. The “io” abbreviation aligns neatly with the computing term “input/output,” making it a natural fit for software products, web apps, APIs, and developer-focused startups. Unlike generic top-level domains, .io registrations are generally priced higher across the board — so comparing registrars carefully can save you a meaningful amount of money each year.

Price comparison: .io domain costs

Ranking by renewal price (.io)

1. Theory7 – ≈ €47.90 / year (renewal)
2. Regery – ≈ €47.99 / year (renewal)
3. Spaceship – ≈ $51.75 / year (renewal)
4. Hostinger – ≈ €65.99 / year (renewal)
5. One.com – ≈ €65.99 / year (renewal)

Cheapest Renewal: Theory7 (Best Long-Term Value)

Theory7 comes out on top for the lowest renewal price on .io domains, sitting at approximately €47.90 per year. When you factor in the first-year registration price of around €35.86, the average cost over two years works out to a reasonable long-term rate compared to the competition. Theory7 is a Dutch-based domain registrar with a strong reputation for transparent pricing and solid support. If you are planning to hold onto a .io domain for multiple years — which is likely if you are building a product or brand around it — Theory7 offers the most predictable and cost-effective path forward. You can read more about them in our Theory7 review to get a fuller picture of what they offer.

Cheapest First Year & Competitive Registration: Regery

Regery offers one of the most attractive entry prices for a .io domain at approximately €25.99 for the first year — a notable discount from their standard renewal rate. This makes it a smart choice if you want to test a domain name or launch a project without committing to high upfront costs. The renewal price climbs to around €47.99 per year, which is very close to Theory7’s renewal rate, making the long-term cost difference minimal. Regery is a growing international registrar with a clean interface and a straightforward domain management experience. If you are looking for a budget-conscious entry point into the .io space without sacrificing reliability, Regery is well worth considering.

Budget First Year: One.com

One.com stands out with the cheapest first-year price among all the registrars compared here, coming in at just approximately €17.49 for the first year. That is a genuinely low entry cost for a .io domain and makes it tempting for anyone wanting to secure a name on a tight budget. However, the renewal price tells a very different story — it jumps all the way to €65.99 per year, which is the joint highest renewal cost in this comparison. One.com is a well-known European hosting and domain provider, and the deal makes sense if you are already within their ecosystem or just need the domain short-term. But for anyone building a long-term product around a .io domain, the renewal price makes it a costly choice after year one.

Popular Alternative: Hostinger

Hostinger is a popular choice for developers and small businesses thanks to its well-known brand and bundled hosting offers. For .io domains, Hostinger charges approximately €27.99 for the first year, which is a competitive introductory price. The issue, much like with One.com, is that the renewal price climbs steeply to €65.99 per year — tied for the highest in this comparison. If you are purchasing a .io domain as part of a broader hosting package with Hostinger, the overall bundle cost may still work out reasonably well. However, if you are registering the domain standalone, the long-term renewal cost makes it hard to justify when Theory7 and Regery both renew at significantly lower rates. Spaceship also sits in the middle ground with a first-year price of around $31.98 and renewals at approximately $51.75 — worth checking if you prefer paying in USD or are already using Spaceship for other domains.

Conclusion

For the absolute lowest renewal cost, Theory7 wins at approximately €47.90 per year, making it the smartest long-term choice for anyone serious about keeping a .io domain. If you want the cheapest first-year registration, One.com offers the lowest entry price at around €17.49 — just be prepared for the steep renewal jump. Regery strikes the best balance between a low first-year price and a manageable renewal rate, making it an excellent all-round option. For those who need hosting bundled in, Hostinger is a familiar choice but carries the highest renewal price. Want to compare even more registrars and TLD prices? Check out tld-prices.com/tld/io for a broader side-by-side comparison of .io pricing across dozens of providers.

Quick links to registrars:

• Register a .io at Theory7 (Cheapest renewal)
• Register a .io at Regery (Best balance of first-year & renewal price)
• Register a .io at One.com (Cheapest first year)
• Check .io domains at Spaceship
• Check .io domains at Hostinger