Three friends started learning languages last year. One did Duolingo every day for nine months and can now order coffee in Spanish, but couldn't hold a five-minute conversation if her holiday depended on it. One did Babbel for three months, hated it, gave up. One paid for Italki lessons twice a week and is now functional in French.
That isn't an indictment of any of these tools. It's a reminder that language apps don't all do the same job, and the right one depends on what you're actually trying to achieve. Pick the wrong tool for your goal and you'll either give up out of boredom or end up with vocabulary you can't deploy.
The four philosophies on offer
Each major UK language app has a distinct teaching philosophy. They're not interchangeable.
Duolingo at free / £6.99 a month for ad-free Super / £14 a month for Max with AI features. Gamified daily practice. Works for habit-building because the streaks and points are genuinely motivating. Less effective for structured grammar than Babbel, and the conversations it teaches are sometimes oddly disconnected from real-world speech.
Babbel at £8-£14 a month. Genuine grammar instruction in bite-sized lessons that build cumulatively. Stronger for European languages than for Asian or non-Latin script languages, where the pedagogy gets noticeably thinner.
Pimsleur at £12-£20 a month. Audio-first with heavy emphasis on listening and pronunciation. Different teaching philosophy entirely — closer to old-school language tapes than to gamified apps. Right for people who learn by ear.
Busuu at £8-£15 a month. Native-speaker community correction is the real differentiator. Lessons are similar to Babbel; the community feedback loop is what you're paying for.
How to actually pick
If you're brand new to a language: start with Duolingo free for three months. The question isn't whether it'll teach you the language — it might not — but whether you'll maintain a daily habit at all. Most adults won't. Better to find that out for free.
If the habit holds: add Babbel as the primary structured course alongside Duolingo for daily reinforcement. Duolingo for the streak; Babbel for actual grammar.
If you're prepping for a specific trip: Pimsleur for the listening and speaking focus. Conversations that work in real situations matter more than vocabulary count when you're standing at a market stall in Tuscany.
If you're learning seriously and want real progress: Babbel + Italki (one-on-one video lessons with native speakers, £8-£25 per lesson). The combination of structured app and real conversation is the closest thing to "what actually works" that I've seen.
If you want native-speaker correction baked in: Busuu earns its keep here.
What I'd swerve: subscribing to multiple language apps simultaneously without using them (the discount on the annual plan won't help you if the app is closed); paying for Rosetta Stone (over-priced relative to alternatives in 2026); free YouTube-only learning if you don't have rare discipline.
The reality of adult language learning
A reality check that no app's marketing will give you: most adults need at least 600 hours of focused practice to reach functional conversation in a Romance language, and significantly more for Mandarin, Japanese, or Arabic. Fifteen minutes of Duolingo a day adds up to about 90 hours a year. So a year of Duolingo gets you to about 15% of functional fluency in a "easy" language for English speakers.
That isn't an argument against starting. It's an argument for setting realistic expectations and pairing apps with real conversation as soon as you can.
Affiliate disclosure: Morningfold has affiliate partnerships with Duolingo, Babbel, Pimsleur, and Busuu. See editorial standards.