The foundational comparison for every domain decision. The overwhelming trust of .com against the startup culture of .io.
The default choice across all industries. Short names are nearly exhausted, and premium aftermarket trading is the norm.
Short names cost tens of thousands to millions on the aftermarket. A prime target for typosquatting.
Observer's Note
This species is so dominant that it defines the evolutionary pressure on all others. "Because .com was taken" is the single greatest catalyst for the birth of new species.
The ccTLD of the British Indian Ocean Territory, but its I/O association fueled explosive adoption in tech.
A 2024 treaty transfers Chagos sovereignty to Mauritius, casting doubt on the ISO 3166-1 "IO" code. ICANN rules allow up to 5 years to retire a ccTLD after its code is removed. Long-term viability remains uncertain.
Observer's Note
The greatest success story of ccTLD repurposing — and its greatest cautionary tale. A species that shows geopolitics can override tech trends.
Observation Axes
| .com | .io | |
|---|---|---|
| Trust | Highest. The unconscious default for consumers and investors. | High within tech. Less familiar to general consumers. |
| Availability | Short names nearly exhausted. Expensive on aftermarket. | Easier than .com, but popular names are competitive. |
| Cost | New registration $10-15/yr. Premium names cost thousands to millions. | New registration $30-50/yr. Far cheaper than .com premiums. |
| Tech Signal | Neutral. Universal across all industries. | Strong. An implicit declaration of being a tech company. |
| Geopolitical Risk | None. ICANN-managed gTLD. | High. Chagos sovereignty transfer may retire the ISO 3166-1 code. |
| SEO | Slight advantage (user .com assumption affects CTR). | No direct disadvantage, but .com redirect assumption may lower CTR. |
Verdict
Choose .com for trust and stability. Choose .io for tech-startup signaling — but accept the geopolitical risk that comes with it.