.app vs .io
A detailed comparison of .app and .io domain extensions — pricing, features, and best use cases.
Our Verdict
.app is the more affordable option, while .app is trending upward. Choose .app for mobile apps, or .io for tech startups.
| Feature | .app | .io |
|---|---|---|
| Registration Price | $14.99/yr | $39.99/yr |
| Year Introduced | 2018 | 1997 |
| HTTPS Required | Yes | No |
| Est. Registrations | 1M+ | 2M+ |
| Growth Trend | Rising | Rising |
| Registry | Google Registry | Internet Computer Bureau |
| Name Availability | High | Medium |
.app Advantages & Disadvantages
Advantages
- HTTPS required (built-in security)
- Clear application association
- Google-backed registry
- Good name availability
Disadvantages
- Must configure SSL (no plain HTTP)
- Less recognized than .com or .io
- Google registry — single company dependency
.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
.app Best For
- Mobile apps
- Web applications
- SaaS products
- PWAs
- Software companies
.io Best For
- Tech startups
- SaaS products
- Developer tools
- API platforms
- Open-source projects
Frequently Asked Questions
Why does .app require HTTPS?
.app is included in the HSTS preload list, which means browsers enforce HTTPS for all .app domains. This was a deliberate security decision by Google Registry to make the entire TLD more secure by default.
Is .app good for mobile app landing pages?
Yes, .app is ideal for mobile app landing pages. The extension immediately signals to visitors that they're visiting a software product's website, and the required HTTPS ensures a secure experience.
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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