.io
The tech and developer standard
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Adopted widely by developer tools, gaming studios, and tech startups, .io reads as technical and current — especially strong for products built by and for engineers.
It reads as short for 'input/output,' a natural fit for technical products, and short .io names are easier to find than short .coms.
Adopted first by developer tools and gaming studios, .io has become the unofficial extension of technical products built by engineers for engineers. Its 1997 origin as the British Indian Ocean Territory's code has almost nothing to do with why it caught on — 'input/output' is the reading nearly everyone assumes.
Short, technical-sounding names work best here — .io rewards brevity and a slightly clipped, product-y feel more than a fully spelled-out brand name would. It's a strong choice if your audience is developers, but weigh it carefully for a consumer product, where .io reads less intuitively to non-technical visitors.