In SRS design, Anki and Quantum Country ask you to think of the answer; Duolingo and Execute Program ask you to input an answer.
I’d thought: latter’s likely more effective, but annoying & slow. Surprised to see these studies found little diff in recall: andymatuschak.org/files/papers/L
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I’ve tried both text and thought input, only found it helpful to type where a key part was spelling. For instance learning a song in a language that I have no knowledge of.
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Right. has suggested that typing is important to Execute Program for this reason: you want to be correct down to the character!