.com still dominates: 52% of all domains. But .io (tech), .ai (AI startups), .co (general business) gaining acceptance. Choice affects: Customer trust (older demographics prefer .com), SEO (minimal impact), Pricing (some TLDs 3x more expensive), Brand perception (industry signals matter).
The .com Standard
.com is default domain extension. Customers type .com automatically. Email from .com addresses more trusted. Investors prefer .com for serious businesses. Resale value highest for .com domains.
When .com is Non-Negotiable
B2C e-commerce (customers expect .com). Professional services targeting 40+ demographics. Businesses with older client base. Companies seeking traditional VC funding. Brands planning major advertising spend. Franchises or multi-location businesses.
.io Domain Extension
Originally British Indian Ocean Territory ccTLD. Repurposed by tech industry (input/output). Signals: Technology company, SaaS platform, Developer tools, Startup. Pricing: $30-60/year (2-3x .com cost).
.io Advantages
Tech credibility - signals you're a tech company. Availability - many short names available on .io. Developer-focused - engineers prefer .io. VC acceptance - tech VCs comfortable with .io. Examples: socket.io, greenhouse.io, about.io.
.io Risk: Geopolitical uncertainty around British Indian Ocean Territory. UK agreed to cede territory to Mauritius. Could affect .io TLD long-term. Most experts believe .io will continue (too valuable to discontinue) but uncertainty exists.
.io Disadvantages
Non-tech customers confused. Older demographics don't trust it. Email deliverability 8% lower than .com. Harder to monetize (lower resale value). Automatic filters sometimes block .io as "not real business". SEO: No penalty but .com has trust advantage.
.ai Domain Extension
Anguilla country code TLD. Adopted by AI/machine learning companies. Pricing: $60-120/year (premium TLD). Highest cost of major extensions.
.ai Positioning
Signals: AI/machine learning company, Cutting-edge technology, Innovation-focused. Ideal for: AI startups, ML platforms, Data science tools, AI consultancies. Examples: character.ai, stability.ai, adept.ai.
.ai Considerations
Very niche - only for AI-related businesses. Expensive - premium pricing always. Availability - many good names already taken by investors. Trend risk - if AI hype cycle ends, domain dated. Consumer confusion - many people don't know .ai exists.
.ai domain surge: 200% registration increase 2022-2024 (ChatGPT effect). Warning: Don't use .ai unless actually AI-related. Brand mismatch if you pivot away from AI. Consider .com for flexibility.
.co Domain Extension
Colombia country code but marketed globally. Alternative to .com when .com taken. Often mistaken for .com (typo risk). Pricing: $20-35/year.
.co Best Use Cases
Your .com is taken by someone else. Short, memorable domain needed. Startup testing product-market fit. Budget-conscious businesses. International companies (co = company). Examples: angel.co, meet.co, t.co (Twitter).
.co Risks
Typo problem: Users type .com, go to competitor. Email confusion: People add 'm' and email wrong company. Trust issues: Some view as "couldn't get .com". Resale value: Lower than .com equivalents. SEO: Google treats as global TLD (no Colombia association) but .com has trust boost.
Other Notable Extensions
.app: Google-owned, requires HTTPS, good for apps. $14-20/year. .tech: Technology companies, broader than .io. $8-50/year. .store: E-commerce, Amazon-owned. $3-60/year. .xyz: Cheap generic, often used by Web3/crypto. $1-15/year. .co.uk: UK businesses (essential if targeting UK). £5-10/year.
Industry-Specific TLDs
.law: Law firms (regulated TLD, verification required). $150-200/year. .finance, .bank: Financial services (highly regulated). $1,000+/year. .health: Healthcare (no verification required). $60-80/year. .edu: Educational institutions only (cannot buy). .gov: Government only (cannot buy).
New Generic TLDs (.shop, .online, .site)
Hundreds of new TLDs launched 2014+. Most failed to gain traction. Generally viewed as "couldn't get .com". Low trust with consumers. Very cheap ($1-10/year) but low value.
When New TLDs Work
Exact match domain important for SEO. Very short name available (1-2 words). Internal tools or side projects. Geographic TLD matches location (.nyc, .london). Industry TLD matches perfectly (.law for lawyers). Examples that work: lawyers.law, news.com.au, amazon.shop.
Email Deliverability Issue: New TLDs (.club, .top, .xyz) heavily used by spammers. Many corporate email filters auto-block them. Your .xyz emails may never reach Fortune 500 contacts. Stick to .com, .io, .co, .ai for professional email.
Geographic TLDs (.us, .uk, .de)
.us: US businesses. Underutilized, .com preferred. $8-15/year. .co.uk: UK businesses (must have UK presence historically, now open). £5-10/year. .de: Germany, very popular in Europe. €5-10/year. .ca: Canada, requires Canadian presence. $15-20 CAD/year. .au: Australia, requires Australian entity. $10-20 AUD/year.
When to Use ccTLDs
Operating exclusively in that country. Want local SEO boost (Google ranks .uk higher in UK searches). Building trust with local customers. Regulatory requirement (some countries require local TLD). Supplement to .com (register both).
Domain Extension SEO Impact
Google's official stance: TLD doesn't affect rankings. Reality: .com has trust signals affecting CTR and engagement. ccTLDs boost local search (e.g., .co.uk ranks better in UK). New TLDs: No inherent penalty but lack trust history. Exact match domains: Less impactful than 2010s, still minor boost.
SEO Best Practices by TLD
.com: No special optimization needed (default trust). .io/.ai/.co: Build trust signals (press, reviews, backlinks). New TLDs: Extra effort on brand building and content. ccTLDs: Target country-specific content and backlinks. All TLDs: Quality content matters more than extension.
Domain Extension Pricing
Budget tier ($1-15/year): .xyz, .online, .site, .tech, .store. Standard tier ($15-35/year): .com, .net, .org, .co. Premium tier ($40-120/year): .io, .ai, .app. Ultra-premium ($150-1,000+/year): .law, .bank, .finance. Aftermarket .com: $1,000-millions (based on name quality).
Hidden Costs
Renewal rates often higher than first year. Premium DNS services extra ($20-50/year). Privacy protection (WHOIS privacy) included on some, $10-15/year on others. Trademark monitoring for valuable domains. SSL certificates (free with Let's Encrypt but paid options $50-300/year).
Domain strategy for startups: First choice: YourBrand.com. If .com taken: Bid to buy .com (many owners will sell for $2,000-10,000). Second choice: YourBrand.io (if tech) or .co (if general). Last resort: ModifiedName.com (e.g., GetYourBrand.com, YourBrandHQ.com). Avoid: New TLDs unless perfect match (.law for law firm).
Buying Premium .com Domains
Your ideal .com taken? Often for sale. Check: Whois lookup for registrant contact. Aftermarket platforms (Sedo, Afternic, GoDaddy Auctions). Domain broker services. Prices: Generic words: $50,000-$1M+. Brandable made-up words: $2,000-25,000. Common phrases: $5,000-50,000. Negotiate: Most sellers overpricing, counter-offer at 30-50% of asking.
Alternatives to Buying .com
Add modifier: GetYourBrand.com, YourBrandHQ.com, TryYourBrand.com. Change spelling: YourBrande.com (risky). Use different word: Synonym or related term + .com. Go with .io/.co: Accept alternative TLD. Rebrand completely: Choose available .com name. Wait and trademark: Build brand on .io, buy .com later when funded.
Domain Extension Recommendations
E-commerce business: .com only. Tech SaaS startup: .com or .io. AI/ML company: .ai or .com. Professional services: .com. Local business: .com + local ccTLD (.co.uk, .de, etc). App: .app or .com. Non-profit: .org or .com. Personal brand: .com. Web3/crypto: .xyz or .com. International expansion: .com + target country ccTLDs.
Multi-Domain Strategy
Successful businesses register: Primary: Your main domain (.com ideally). Defensive: Common misspellings. Geographic: ccTLDs for major markets. Alternative TLDs: .io, .co to prevent competitors. Redirect all to primary domain for SEO consolidation.
Check domain availability before choosing business name. Trademark Lens checks .com, .io, .ai, .co, and ccTLD availability plus trademark conflicts in one search.