While not exactly the same as lnav, at Mobile Jazz we're building a remote logger for mobile devices (iOS only at this stage, support for Android, JS web apps and native desktop applications coming soon): http://bugfender.com/

We use Bugfender already for our own applications as well as for our clients, but we'd love to hear some unbiased feedback from other people whether or not this would be a useful product worth paying for. You can sign up here for a free beta account: https://app.bugfender.com/signup