.co vs .io
A detailed comparison of .co and .io domain extensions — pricing, features, and best use cases.
Our Verdict
.co is the more affordable option, while .io is trending upward. Choose .co for startups and scaleups, or .io for tech startups.
| Feature | .co | .io |
|---|---|---|
| Registration Price | $29.99/yr | $39.99/yr |
| Year Introduced | 2010 | 1997 |
| HTTPS Required | No | No |
| Est. Registrations | 2M+ | 2M+ |
| Growth Trend | Stable | Rising |
| Registry | .CO Internet S.A.S. | Internet Computer Bureau |
| Name Availability | High | Medium |
.co Advantages & Disadvantages
Advantages
- Short and memorable (only 2 characters)
- Strong global recognition
- Supported by all major registrars
- No registration restrictions
Disadvantages
- Users may accidentally type .com
- Higher renewal prices than .com
- Less established trust than .com
.io Advantages & Disadvantages
Advantages
- Strong tech brand association
- Better name availability than .com
- Short and memorable
- I/O computing connection
Disadvantages
- Premium pricing ($30-50/year)
- Country code controversy (BIOT)
- Not ideal for non-tech businesses
.co Best For
- Startups and scaleups
- Modern tech companies
- E-commerce brands
- URL shortening
- Global commercial businesses
.io Best For
- Tech startups
- SaaS products
- Developer tools
- API platforms
- Open-source projects
Frequently Asked Questions
Is .co a good domain for a startup?
.co is a popular choice for startups, especially when the .com equivalent is taken. It's short, globally recognized, and carries a professional image. Many funded startups use .co as their primary domain.
What is the difference between .co and .com?
.com is the original commercial TLD and remains the most trusted. .co is a newer alternative that looks similar and works well for startups and modern brands. The main risk with .co is users accidentally typing .com.
Is .io good for startups?
Yes, .io is widely accepted and even preferred in the startup ecosystem. Tech investors, developers, and early adopters recognize .io as a legitimate, modern domain choice. Many successful companies use .io domains.
Is .io good for SEO?
Google treats .io as a generic TLD for search purposes, not as a country code. This means .io domains are not geo-targeted and can rank globally, making them excellent for international SaaS products.
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