Android: Not every part of the lecture or interview you are recording is interesting, but when the speaker does say something important, you want to be able to go back to it. Cogi makes it easy with a smart highlighting feature, along with other annotation tools.
Tap the big Highlight button and Cogi will mark that time as important. And since the person might be mid-sentence, Cogi smartly starts highlighting from 15 seconds before you tap. There might also be visual elements being shown by the speaker, like Presentation slides. Cogi has a built-in camera app to let you capture those for future reference. Unfortunately, there's no timestamp on those images so you don't know at which point of the talk they were shown.
And one of my favourite features in the app is the ability to add tags to your voice notes, making it easy to search for them later. You can also add people from your address book to the notes, but this feature didn't work as advertised for me. Still, if you're looking for a voice recorder for lectures and interviews, Cogi is the way to go.
Cogi Note & Voice Recorder (Free) [Google Play Store]