Published: 19.05.2026
The .app extension was created for software of every kind: mobile apps, web apps, desktop programs and online services. It has one distinctive feature that makes it different from older zones: it is secure by design.
Check if a .app domain is available .app Check
A short history
.app was one of the new generic top-level domains created in the program that opened the domain system in the 2010s. It was delegated in 2015 and, after a period of reserved registrations for trademark holders and early access, it became available to everyone in 2018. The registry is operated by Google, which also runs other extensions for technology users. The extension quickly became popular among developers and start-ups because the word "app" describes the product directly.
Who runs it
The registry is Google Registry. Customers register names through accredited registrars, and the registry keeps the central database. Because the zone is run by one large operator, its technical policies are consistent and well documented.
The main rule: HTTPS only
The whole .app zone is on the HSTS preload list of modern browsers. This means browsers will connect to any .app website only over an encrypted HTTPS connection. If a site on .app has no valid SSL certificate, it will simply not open, and visitors will see a security error.
The result is a safer internet for visitors, but you must prepare for it:
- Install an SSL certificate before you point the domain to the site.
- Make sure the certificate covers the www name and subdomains that you use.
- Set automatic renewal so that the certificate never expires.
- Check that all images, scripts and styles also load over HTTPS.
Other rules
- Open to everyone: no residency or business status is required.
- Names can be up to 63 characters; letters, digits and hyphens are used.
- Registration for one year or more, with renewal at a fixed rate that can be higher than classic zones for premium names.
Who uses .app
- Developers who publish a mobile or web application and want a clear address for it.
- Companies that give each product its own address, for example product.app.
- Landing pages for downloads, support and documentation.
- Tools and services that sell subscriptions online.
Strengths
The extension explains itself and has a modern look. It guarantees encryption, which builds trust, and it has more free short names than .com. It is a good place for a product page that lives next to the main company site.
Weaknesses
- HTTPS is mandatory, which can surprise those who forget about certificates.
- The word is less natural for non-technical businesses.
- Some visitors may type .com out of habit, so protect the brand with an extra domain if it matters.
Tips for a smooth launch
- Prepare the hosting and the certificate first, and test the site through the temporary address.
- Register the domain and set the DNS records for the web and mail.
- Use the same name in app store listings, documentation and the website for consistent branding.
- Set redirects from the version without www or from other domains you own.
Frequently asked questions
Do I need an app to use .app? No. Anyone can register the extension, but it suits software products best.
Can I use .app with a free certificate? Yes. Free automatically renewed certificates are fully compatible.
Why does my .app site show a security error? The certificate is missing, expired or does not match the name. Fix it and the site will open.
