Preply 1-on-1 Tutoring vs Duolingo Max
Same Bayesian formula, same rubric — so the difference in scores reflects the difference in the courses, not the difference in how we evaluated them.
Preply · Languages
Preply 1-on-1 Tutoring
Duolingo · Languages
Duolingo Max
Per-criterion
No curriculum — content is whatever the tutor brings. Preply's package model nudges teachers toward longer engagements and marginally more structured plans than italki's pay-per-lesson default, but variance is still large and the platform does not vet pedagogy.
Broad global tutor pool, strong supply in English-as-a-second-language and major European languages. Reviewers find tutors for less-common languages like Khmer at $10-15/hour. Vetting remains the student's job — most learners trial 2-4 tutors before settling.
Per-hour rates ($10-30) overlap with italki, but subscription-style packages and aggressive cancellation friction pull effective value down. Reviewers describe pricing that "always comes up higher, never lower" and packages that can expire on tutor reschedules.
The subscription mechanic is the biggest contrast with italki — pre-paid weekly packages create real commitment that helps learners who would otherwise drift. The same mechanic frustrates anyone who changes tutors or pauses; works for steady users, against churning ones.
Same speaking-and-correction engine as italki and the same outcomes — multiple Hacker News commenters credit weekly Preply tutors with breaking them out of Duolingo plateaus into actual conversation. The product is the tutor, and the tutor works.
Same Duolingo curriculum as Super with three AI bolt-ons — Explain My Answer, Roleplay, Video Call. AI explanations sometimes get grammar wrong and Roleplay topics are narrow, so the content lift over Super is real but modest.
The "instructor" is GPT-4 behind a Duolingo wrapper. It can explain basic grammar and hold a short roleplay, but multiple reviewers report it makes mistakes and is much narrower than ChatGPT/Claude direct, and far below an italki tutor on actual correction quality.
Roughly $30/month — more than 2× Super's $13. Reviewers flag that ChatGPT Plus/Claude Pro ($20) cover the AI capability with no topic limits, and a weekly italki lesson ($10-15) buys real human correction. Weakest dimension by a wide margin.
Inherits Duolingo's streak engine, leaderboards and daily quests — the strongest retention layer in the category. Max-specific features add little; reviewers describe the AI call as a "try one free, then upgrade" upsell rather than a habit driver.
Roleplay forces some output production, structurally better than Duolingo's tap-the-tile drill, but topic scope is narrow and it does not replicate real-conversation unpredictability. Better than Super at speaking, still well below a live tutor.
Scoring methodology applies identically to every course on the site — see the formula.