.app 的網域將開放註冊：「Introducing .app, a more secure home for apps on the web」。
.app 網域都已經被 Google 設定 HSTS Preload 了：
A key benefit of the .app domain is that security is built in—for you and your users. The big difference is that HTTPS is required to connect to all .app websites, helping protect against ad malware and tracking injection by ISPs, in addition to safeguarding against spying on open WiFi networks. Because .app will be the first TLD with enforced security made available for general registration, it’s helping move the web to an HTTPS-everywhere future in a big way.