How to Choose a Domain Name for Your App or Business

How to choose a domain name: what makes a good one, .com vs .app, .io and .ai, workarounds when your name is taken, and what to check before you buy.

Mythex Team · 2026-09-29 · 5 min read

A good domain name is short, easy to say and spell, matches your brand, and doesn't get confused with someone else's. Use .com if you can get a clean one; otherwise a country ending (for a local business) or an ending like .app, .io or .ai (for software) works fine. Before buying, check the renewal price, trademarks and how it sounds out loud — and buy it in an account you control.

The domain matters because people type it, say it and see it in every link. It matters less than it used to, because most visitors arrive from search results, links and bookmarks rather than typing it in.

What makes a good domain name

Quality	Why	Test
Easy to say	People share it verbally	Say it to someone; can they type it without help?
Easy to spell	Typos go elsewhere	No odd spellings, doubled letters or confusing words
Short enough	Fits on cards, screens and in memory	Can you read it at a glance?
Matches your brand	Avoids "wait, which site?"	Same name as the product or company
No hyphens or digits	Hard to say out loud ("dash", "four or f-o-u-r?")	Would you need to explain it?
Not confusable	Protects visitors and you	Is there a similar domain owned by someone else?

If you haven't settled the name itself yet, start with how to name your app. The domain follows from the name, not the other way around.

Choosing the ending (TLD)

The ending after the last dot — .com, .org, .app — is the top-level domain, or TLD. There are hundreds. The ones most businesses consider:

Ending	What it is	Good for	Keep in mind
`.com`	The original generic ending	Almost anything; broad audiences	Short, clean names are hard to find
Country codes (`.co.uk`, `.de`, `.ca`…)	Country-code TLDs	Businesses focused on one country	Some have residency or local-presence rules
`.org`	Generic, associated with non-profits	Non-profits, communities, open-source	Open to anyone, but readers may assume non-profit
`.io`	Country code for the British Indian Ocean Territory	Software and developer tools, by convention	Technically a country code; not a local signal most people notice
`.ai`	Country code for Anguilla	AI products	Often priced higher than `.com`
`.app` / `.dev`	Generic TLDs run by Google Registry	Apps and developer projects	Require HTTPS — see below
`.co`	Country code for Colombia, used widely as "company"	Startups	Easy to confuse with `.com` when typed

The country-code facts for .io and .ai come from the IANA root zone database, which lists who manages every TLD.

The HTTPS rule for .app and .dev

.app and .dev (along with some other Google Registry endings) are on the browser HSTS preload list. That means browsers will only load these sites over HTTPS — a plain http:// version won't work at all. Most modern hosts issue certificates automatically, so it's rarely a problem, but check before pointing one at an older host. What is HTTPS and SSL explains certificates.

Does the ending affect SEO?

Not in a way worth choosing around. Search engines rank pages on their content. Country-code endings can suggest the site is aimed at that country, which suits a local business and can be a mild drawback for a global one. See SEO for AI-built websites for what matters more.

When the name you want is taken

It usually is. Options, roughly from best to worst:

Add a short word. getname.com, trynamehq.com, nameapp.com, usename.com. Common and widely understood.
Use a different ending. name.app or name.io if the .com is parked or unused — but check who owns the .com first. If it's an active business in your space, visitors will end up there.
Use a product subdomain on your company domain. name.yourcompany.com works while you're small.
Buy it from the owner. Many taken domains are parked and for sale. Use a reputable domain escrow service rather than paying a stranger directly, and set a budget before you start negotiating.
Change the name. If every variant is a problem, the name may be the problem.

Avoid misspellings (namr.com, nayme.com) and adding hyphens. Both create a permanent "no, the other one" problem.

Checks before you buy

Trademarks. Search your national trademark database and the WIPO Global Brand Database for the name. A domain doesn't give you rights to a name someone else has trademarked. For anything you'll invest in, get advice from a trademark lawyer.
History. Look the domain up in a web archive to see what it was used for before. A domain previously used for spam can carry a bad reputation, including with email providers.
Renewal price. Introductory prices are common. Look at what the second year costs. Domains marked "premium" can have higher renewal prices too, not just a higher purchase price.
Out loud. Say it, spell it, and read it in lowercase with no spaces. Some word combinations read very differently when joined.
Social handles. Ideally the same name is available on the platforms you'll use.

Where to buy, and how

A registrar is a company accredited to sell domains. Many exist, and prices and extras vary — some registrars, such as Cloudflare Registrar, say they charge the registry's price with no markup. When comparing, look at:

first-year and renewal prices;
whether WHOIS privacy (hiding your personal details from public records) is included;
DNS management and how easy it is to add records;
how easy it is to transfer the domain away later;
two-factor authentication on the account.

Some hosts and app builders let you buy a domain inside the product, which also sets up DNS for you. That's convenient; just make sure you can transfer the domain out later if you want.

Protect the domain once you have it

Buy it in your own account, or your company's — not a freelancer's or agency's.
Turn on auto-renew and keep the payment card current. An expired domain takes down your site and any email on it, and after a grace period someone else can register it.
Enable two-factor authentication on the registrar account.
Consider registering the obvious variants — the .com if you use another ending, or a common misspelling — if they're cheap. Don't overdo it.

Connecting it to your app

Once you own the domain, you point it at your host by adding DNS records, usually a CNAME for a subdomain like www or app. How to connect a custom domain walks through it, and how domains and DNS work explains the pieces.

Domain checklist

Matches your product or company name
Easy to say, spell and remember
No hyphens, digits or odd spellings
Ending suits your audience
No conflicting trademark or active similar domain
Clean history in a web archive
Renewal price is acceptable
Registered in an account you control, with auto-renew and 2FA on

Domains with Mythex

Every published Mythex app gets a free <name>.mythex.ai address, so you can launch before you buy a domain. On the Pro plan you can connect a domain you already own with a CNAME record, or search for and buy one inside Mythex; bought domains are billed separately from the plan, renew yearly with auto-renew on by default, and can be transferred out. HTTPS is set up automatically. The custom domains docs cover both routes.

Questions

Is .com still the best domain ending?

It's the ending most people assume, so it's the safest default for a broad audience. It isn't required: country endings suit local businesses, and endings like .app, .io or .ai are common for software. Pick one that's easy to say and doesn't send people to a competitor.

Does the domain ending affect SEO?

Not in a way you should choose around. Search engines rank pages on their content and usefulness. Country-code endings can signal that a site targets that country, which helps a local business and can be a drawback for a global one.

Where should I buy a domain?

From an accredited registrar you trust, in an account you control. Compare the renewal price, not just the first-year price, and check that WHOIS privacy and DNS management are included. Some hosts and app builders also sell domains directly.

What if the domain I want is taken?

Try a prefix or suffix such as get, try or app, a different ending, or a slightly different name. You can also ask the owner if they'll sell, ideally through an escrow service. Avoid misspellings, which lose visitors to the original.