Mondly vs Duolingo: Which Self-Study App Actually Fits?
Short answer, and we will not dress it up: for most learners, and especially English speakers, Duolingo is the stronger of these two. Its full course is free with ads, so you never have to pay to keep going, and its paid Max tier offers open-ended AI conversation practice through Video Call and Roleplay. Mondly's free tier is thinner and keeps more behind Premium.
Mondly earns its place in a narrower set of cases, and they are real ones: when it teaches your specific native-language-to-target pairing that Duolingo does not, when you want explicit grammar guides and conjugation tables rather than learning grammar implicitly, or when you would rather buy a one-time Lifetime licence than hold a subscription. If one of those is you, Mondly is a sensible choice.
The honest framing either way: both are self-study apps, and neither makes you fluent on its own. The real upgrade in speaking is a human teacher, not swapping one app for the other. Verified July 23, 2026.
Same category, two different bets
Both of these are self-study apps you use alone, so the comparison is not live classes against software, the way it is with a school. It is two apps that make different bets. Duolingo bets on a huge free tier and habit mechanics that get you to open it daily. Mondly bets on teaching from your own native language and bundling grammar reference and extras into a paid tier.
Mondly vs Duolingo, side by side
| What you are comparing | Mondly | Duolingo |
|---|---|---|
| Free tier | Limited: a daily lesson, challenges and vocabulary review, with most features behind Premium | The full course is free with ads; you never have to pay to keep learning |
| Languages | 41 languages taught from your own native language, over 1,000 language combinations | 40+ languages and 100+ courses; its 7 most popular languages are taught from all 28 interface languages |
| Speaking practice | Conversation practice that runs on set scenarios, in Premium | On Max, open-ended AI Video Call and Roleplay for supported languages |
| Explicit grammar | Premium includes grammar guides and conjugation tables | Grammar is mostly taught implicitly through exercises, with fewer reference tables |
| Habit and gamification | Daily lessons plus weekly and monthly challenges | Streaks and game mechanics that are the category benchmark for showing up |
| Paying once | A one-time Lifetime purchase is offered alongside subscriptions | Paid tiers Super and Max are subscriptions only |
| Published price | None on mondly.com; the US App Store showed 15.90 dollars monthly and 74.90 dollars yearly | No single price published; base courses are free, Super and Max vary by region |
| Refund position | Non-refundable by default; a 14-day cooling-off applies only to UK and EU subscribers | Free to use; paid subscriptions bought in a store follow that store’s refund policy |
| Extras | Pronunciation lessons, augmented-reality lessons and a Kids mode in Premium | Stories and in-app practice; a very large active learner base |
Highlighted cell marks the clear advantage. Duolingo takes more of them, which is the honest result for most learners; Mondly's wins are specific and they matter to the people they matter to. Mondly verified on mondly.com and its store listing July 23, 2026; Duolingo verified on duolingo.com and its blog July 23, 2026.
Why Duolingo wins for most people
The free tier is the heart of it. Duolingo states that everyone can access its courses without spending anything, whether you take one course or forty, with ads shown to free users. That means the entire vocabulary-and-habit stage, which is all most people need at the start, costs nothing. Its streak and game mechanics are the category benchmark at the one thing that actually decides beginner progress, which is opening the app at all.
If you do pay, Max is the more advanced upgrade. It adds Video Call, an open-ended AI conversation with feedback, and Roleplay, both powered by AI, for English speakers learning Spanish, French, German, Italian and Portuguese, with Video Call also available on Japanese, Korean and Chinese. That is genuine open conversation practice, and it is more than Mondly's equivalent offers.
Where Mondly is the right call
Mondly's real advantage is that it is built to teach from your own native language, advertising 41 languages across more than 1,000 combinations. Be precise about how big that edge is, though: Duolingo now teaches its seven most popular languages from all 28 of its interface languages, so the native-language advantage only bites when your specific pairing is one Duolingo does not offer. Where it does not, Mondly is very often the app that fills the gap, and that is a real reason to choose it.
Two more genuine reasons. First, Mondly's Premium bundles explicit grammar guides and conjugation tables, where Duolingo teaches grammar mostly by doing, so if you want reference material to study from, Mondly gives you more of it. Second, Mondly offers a one-time Lifetime purchase, which its subscription terms describe as perpetual, so if you dislike recurring subscriptions you can pay once. Duolingo's paid tiers are subscriptions only.
Our full Mondly review covers the free and Premium split, the store pricing and the refund terms in detail.
See what Mondly Premium includes
Price and refunds, honestly
Neither company makes this easy. Duolingo publishes no single price for Super or Max and it varies by region, though the base courses are free. Mondly publishes no price on its own site either; the figures you can verify come from the app stores, where the US App Store listing showed 15.90 dollars a month and 74.90 dollars a year when we checked, plus a Lifetime option whose price is not published.
One refund detail matters for buyers in the United States. Mondly's subscription terms state that amounts are non-refundable unless stated otherwise, and grant a 14-day cooling-off right only to subscribers in the UK and EU. A US buyer does not get that cooling-off period, and a subscription bought through an app store can only be cancelled or refunded by that store. Duolingo's paid tiers, bought through a store, follow the same store-policy rule, but its free base means you can try the actual course without paying at all. On store ratings, Mondly showed 4.7 out of 5 from 33,000 US App Store ratings against 2.6 out of 5 from 779 Trustpilot reviews, both checked July 23, 2026, with the low scores driven by billing rather than teaching.
Which should you choose
- Check Duolingo first. If it teaches your language pairing, its free tier is the sensible place to start, and paying is optional.
- Look up your exact pairing. If you want to learn from a native language Duolingo does not support for your target, Mondly is the app that probably does.
- Decide how you like to study grammar. Want tables and reference to study from? Mondly gives you more. Happy to absorb grammar through exercises? Duolingo is fine.
- Think about how you pay. If you refuse subscriptions, Mondly's one-time Lifetime is the option that fits. If free-with-ads is enough, Duolingo already is that.
- Then plan the real upgrade. Whichever app you use, book a live lesson when you are ready to actually speak, because that is the step neither app replaces.
Our pick for most learners: start with Duolingo, because a free course you will open daily beats a paid one you will not, and its Max tier is the stronger paid upgrade. Choose Mondly if it teaches a native-language pairing Duolingo does not, if you want explicit grammar and conjugation reference, or if you want to pay once with Lifetime instead of subscribing.
See what Mondly Premium includes
Related reading
For the full detail on Mondly, including the store prices, the Lifetime option and the refund terms, see our Mondly review. When you are ready to add a real teacher, which is the upgrade neither app replaces, our italki review and the language learning hub set out how to do it without wasting money.
Frequently asked questions
Is Mondly or Duolingo better?
For most learners, especially English speakers, Duolingo is the stronger starting point, because its full course is free with ads and its paid Max tier offers open-ended AI conversation practice. Mondly is the better pick in a narrower set of cases: when it teaches your specific native-language-to-target pairing that Duolingo does not, when you want explicit grammar guides and conjugation tables, or when you would rather buy a one-time Lifetime licence than hold a subscription. Neither app makes you fluent on its own; both are self-study that you eventually pair with a real teacher.
Is Duolingo really free?
Yes. Duolingo states that everyone can access its courses without spending anything, with advertising shown to free users. Its paid tiers remove ads and add features: Super gives unlimited energy and personalised review, and Max adds AI-powered Video Call and Roleplay for supported languages. Mondly also has a free tier, but it is thinner, offering a daily lesson and review while keeping conversation practice, grammar guides and other features for Premium subscribers.
Does Mondly teach from my own language when Duolingo does not?
Sometimes, and this is Mondly’s clearest advantage, but it is narrower than it used to be. Mondly advertises 41 languages taught from your native language across more than 1,000 combinations. Duolingo has expanded so that its seven most popular languages are now taught from all 28 of its interface languages. So check whether your specific pairing exists on Duolingo first; where it does not, Mondly is the app that likely fills the gap.
Which has better AI conversation practice?
Duolingo, if you pay for Max. Its Video Call and Roleplay features hold open-ended conversations and give feedback, and are available for English speakers learning Spanish, French, German, Italian and Portuguese, with Video Call also on Japanese, Korean and Chinese. Mondly’s conversation practice, part of Premium, runs on set scenarios rather than open-ended chat, so it is useful for structured speaking drills but is not the same as an open AI conversation. We do not present Mondly’s feature as more than it is.
Which should I actually choose?
Start free on Duolingo if it teaches your language, because paying for the vocabulary-and-habit stage is optional. Choose Mondly if it covers a native-language pairing Duolingo does not, if you want explicit grammar and conjugation reference, or if you prefer a one-time Lifetime purchase to a subscription. Whichever you pick, remember that the real step up in speaking is adding a human teacher, not switching from one app to the other, which is why our language hub points to live lessons as the next move.
How we reach these verdicts, and the sources behind them, is on our methodology page. Mondly's free and Premium contents, language claims, store prices, subscription terms and refund rules were read on mondly.com, its subscription terms, the US App Store listing and Trustpilot and verified July 23, 2026; Duolingo's free access, Super and Max features, AI Video Call and Roleplay availability and course breadth were read on duolingo.com and its blog and verified July 23, 2026. We publish no Duolingo price because it publishes none and its base courses are free, and no Mondly price on its own authority because Mondly publishes none; store figures are attributed to the store. Ratings are attributed to their platforms. We earn a commission if you subscribe to Mondly through our link. Duolingo is named here purely as a benchmark: we have no commercial relationship with it and do not link to it.