Trillium. It works well via browser and reasonably on a mobile browser.

Obsidian is excellent but I can’t install any applications on my work computer and the web hosted version was buggy and slow. If I didn’t have IT blocking me I’d be using Obsidian again.

Shop.com has a great service that combs through my email and tracks everything I’ve ordered and when it’s coming. It even has access to my Amazon account directly since their tracking isn’t in the email. You’d need a service that can do that without selling your entire purchase history to anyone who’s interested. Good luck.