Yes. We do not access or store your Instagram password. The browser extension and the Apple app use your own signed-in Instagram session.
Can I use it on mobile?
Yes. The web app works in any mobile browser. For private accounts, use the app on iPhone and iPad, or the browser extension in Firefox for Android.
What data does it use?
The web app uses publicly available Instagram data. The browser extension and the Apple app use your own signed-in Instagram session to read private accounts you already follow.