The free-tier reality, per each developer's documented plan pages: Duolingo free is a complete course with ads and hearts (error limits); Babbel's free tier documents only the first lesson of each course — effectively a trial; Pimsleur's free lesson is one session. The pick by learner type: casual and curious → Duolingo free, indefinitely; conversational-by-a-deadline → a paid subscription where structure matters more than price; grammar-and-reading learners → a textbook app approach rather than any gamified pick.
The documented comparison
| App | Free tier documents | Paid price (listed late 2025) | Best for |
|---|---|---|---|
| Duolingo | Full courses, ads, hearts limit; Super removes both | $12.99/mo or ~$83.99/yr | Habit-building, casual learning |
| Babbel | First lesson only | from $8–15/mo by term length | Structured conversational courses |
| Pimsleur | One free lesson | $20.95/mo or course purchase | Audio-first, commute learning |
| Anki | Free on Android/web; iOS app $24.99 one-time | None needed | Vocabulary volume, serious study |
Which method works — per the evidence?
What documented research consistently supports: spaced repetition (Anki's entire design), daily contact (streaks gamify a real principle), and speaking practice (the piece apps simulate worst). What apps oversell: fluency from tapping — speaking with humans, via tutoring platforms or local conversation groups, remains the documented gap-closer that no subscription replaces.
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How do you choose without wasting money?
- Run the free tier for a month — Duolingo free or any app's trial; the honest data is whether you return daily, not which app ranked first.
- Match to your dead time: commutes suit audio (Pimsleur); couch time suits gamified (Duolingo); study sessions suit structured (Babbel) or Anki decks.
- Check annual pricing — every service documents steep discounts for yearly commitment; monthly-plus-quitting is the documented most expensive path.
What are the catches nobody mentions?
- Duolingo's hearts: the free error limit pushes subscription psychologically — the documented workaround is practicing, not paying, when you're refining rather than learning.
- Streak anxiety: the gamification works on some users and stresses others; streak freezes document a fix, deciding you don't care is also a fix.
- Course quality varies by language: documented course depth for Spanish dwarfs, say, Swahili — check the course's documented length before committing to a rare language.
The verdict
Duolingo free for building the habit, Babbel when structure pays for itself, Pimsleur for ears-only commutes, Anki for volume — and any of them plus actual conversation for results. What no source establishes: an app alone producing fluency; apps documentedly produce consistency, which is the prerequisite.