I don't think so there is a web app but you can you use italki website on your computer.

No need an app for installation. Just access the website, italki.com 🙏

You can use the italki website on the computer

我在笔记本电脑上使用italki， 但我不需要安装任何东西。 您可以在互联网上访问 italki。 I use italki on my laptop, but I don't need to install anything. You can access italki on the internet. Good luck!