I'm currently using RoboForm's iPad app which only provides automatic login within it's own internal browser. Do any of these password managers handle authentication prompts wherever they occur? There are lots of apps and alternative browsers that require login. For example, the Apple Store even requires login to download free apps.
It's frustrating to have to exit that app, go to a password manager, search for the login, memorize the user ID (I use different user ID's when possible), copy the password to the clipboard, navigate back to the app, type the user ID, paste the password in and then proceed.