Chat & research · 5 tools · updated Oct 15, 2026
Learn a subject or language with an AI tutor
Speak leads with an evidence score of 52/100, ahead of Khanmigo (17) and Duolingo Max (10). 4 of 5 can be used free. Best for speaking practice with feedback: Speak.
Ranked by evidence — GitHub stars, Hacker News mentions, release activity and how much you can use for free. Recomputed nightly. How the score works.
+ Gets you talking from the first lesson with open-ended AI conversations rather than tap-the-word drills.
− Limited language selection and no meaningful free tier beyond a trial.
+ Deliberately refuses to just give the answer, nudging students through the problem with questions.
− Can be slow and occasionally makes arithmetic mistakes while tutoring math.
+ Video Call puts you in an unscripted spoken conversation that adapts to your level inside the app you already use.
− Pricey relative to Super Duolingo, and the AI features are only available for a subset of courses.
+ Phoneme-level feedback shows exactly which sounds in a word you are mispronouncing.
− English-only, and the scoring can be strict on perfectly intelligible accents.
+ Upload class notes and get flashcards, practice tests and outlines generated automatically.
− Many once-free study modes moved behind the Plus paywall.
Head to head: Speak vs Khanmigo Speak vs Duolingo Max Khanmigo vs Duolingo Max
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