The part after the dot — .com, .io, .ai, .co, .net — isn't just a technical suffix. It's a quiet signal about who you are and what kind of business you run. Picking the right one is a small decision with outsized brand consequences.
The short version: which ending for which business?
| Ending | Best for | Avoid if |
|---|---|---|
.com | Almost anything — broadest trust, most familiar to non-tech audiences | Already taken (very likely) and the alternatives feel forced |
.io | Developer tools, SaaS, technical infrastructure | Selling to a non-technical audience (grandparents won't recognize it) |
.ai | AI / machine-learning products specifically | You're not actually doing AI — it'll read as bandwagoning |
.co | Modern startups, when .com is unavailable | Customers might confuse it with Colombia (.co is technically Colombia's country code) |
.net | Networking / infrastructure companies, secondary fallback for .com | You want to feel current — .net peaked in 2003 |
.org | Non-profits, communities, open-source projects | You're a for-profit business — it'll look misleading |
.app / .dev | Apps and developer products (HTTPS-only by default, a small SEO plus) | Brand needs to feel timeless — these endings still feel new |
.shop | E-commerce, especially when "shop" is in your brand | You sell to enterprises — it reads as consumer |
The head-to-head comparisons people actually ask about
.io vs .ai — which domain extension?
Pick .ai only if artificial intelligence is genuinely core to your product — it reads as "an AI company" and is the stronger signal for ML/AI tools. Pick .io for developer tools, SaaS, and technical infrastructure that isn't specifically AI. Both say "modern tech company" to a technical audience, and neither is ideal for a mainstream non-technical market. One practical note: .ai renews noticeably more expensively than .io at most registrars, so factor the long-term cost in.
.co vs .io
Choose .co when your customers are mainstream or business buyers and the .com is taken — it's the closest "feels like .com" alternative and reads as a modern startup. Choose .io when your audience is technical (developers, SaaS). The trade-off: .co is far more familiar to non-tech customers but is occasionally typed as .com by mistake; .io signals "tech" clearly but means nothing to a general audience.
Why .com still wins (when you can get it)
Studies consistently show .com has the highest user trust and the lowest perceived friction. People default to .com when typing a remembered domain — if your site is on .io and someone types yourbrand.com out of habit, they may land on a competitor's parked page. That's a real cost.
That said: .com domains short enough to remember are mostly gone, and the ones still available are either very long, very contrived, or held by domain investors charging five-figure prices. For most new businesses, the question isn't whether to use .com — it's whether a clean short alternative beats a clunky long .com.
When .io is the right call
If your audience is developers, technical buyers, or anyone who lives in the JavaScript ecosystem, .io reads as "modern company, technical product." It's how Stripe, Notion, Loom and thousands of YC startups operated for years. Caveats:
- Renewal costs are higher than
.com(typically $40–$60/yr vs $13–$20/yr) - Non-technical audiences may not recognize it — if your customers are dentists or florists,
.comis still safer - Technically a country-code TLD (British Indian Ocean Territory) — in 2024 there was a brief scare about the registry being retired. It's stable for now but worth knowing.
The .ai bubble is real — pick carefully
Since 2023, .ai has gone from niche to mainstream. Renewal is expensive ($100+/yr) and short names sell for tens of thousands. If your business is genuinely AI-focused, .ai instantly signals "I do AI" without needing to explain. If your business merely uses AI like every modern product does, .ai will read as bandwagoning — and your customers won't be impressed.
Rule of thumb: would your homepage feel authentic if the URL didn't end in .ai? If yes, stick with .com.
Endings to avoid (mostly)
Some endings carry baggage that no marketing can scrub off:
.biz— reads as "I couldn't get the .com." Don't..info— flooded by spam in the 2000s, now associated with low-quality sites..click,.xyz,.top— heavily abused for malware and phishing campaigns. Many email servers treat mail from these domains as suspicious by default.- Long descriptive endings like
.consulting,.solutions,.management— technically available, almost never the right choice. They make domains too long.
Exception: if the ending is part of your brand pun (a wine shop on .wine, a law firm on .law), it can work. But this is a high bar.
The trust calculus
Imagine your customer is about to put their credit card into a checkout form. Which makes them more comfortable?
checkout.acmestore.comcheckout.acmestore.shopcheckout.acmestore.click
The first two are fine. The third will make some shoppers hesitate — even if your business is completely legitimate. That hesitation is conversion you'll never know you lost.
Our recommendation
- Try
.comfirst. If a short, brandable one is available, take it. - If
.comis taken, try a 1-word prefix (get,try,my,use) before switching endings. - For tech-audience products,
.ioor.coare fully respectable alternatives. - For genuine AI products,
.aiis worth the premium. - For everyone else, accept a slightly longer
.comover a short oddball ending. Your customers will thank you.
And whichever you pick: buy the .com too if you can, even just as a defensive redirect. Costs you $15/yr and prevents a competitor or squatter from parking on the obvious typo.
Lock yours in
Use our domain search to see which endings are available for your name in real time. We support 250+ extensions and you can register any of them in a single checkout.
