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.co vs .io

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Is there a particular hierarchy or rationale for choosing a .co extension over a .io if both are available (and .com is unavailable) for a given domain? Please advise. Thanks.
 
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Target markets. The .IO seems to be favoured by tech startups. The .CO is still a ccTLD and if the .COM is taken, it is almost certain that the .CO will lose traffic to the .COM if it has a website.

Regards...jmcc
 
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.co is cheaper, especially for the first year reg, usually only a few dollars. io can run up to $40 or more at some places. Both seem to be in the same realm of acceptability.
 
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.io mostly used by tech, web companies
.co used by new startups

go with .co and grab .io as backup if you are interested
 
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Co is good for company brands, single words especially. IO is best for tech brands.

For example:

Tile.co for a Tile Company
Byte.io for a software company.
 
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