What's the best way to learn a language offline?
Use two kinds of tools together. Use downloaded flashcards, audio and a dictionary for review and listening, because they work anywhere. Add something that lets you speak, because that is the part most offline options leave out. Which tools you pick depends on what you want to do without a signal.
What works offline without any trouble?
Quite a lot, and most of it is free or cheap:
- Flashcards. Spaced repetition apps such as Anki keep your cards on the phone, so you can review on a plane or a train. Syncing needs a connection, but reviewing does not.
- Downloaded audio. Podcasts, graded listening courses and audiobooks can be saved ahead of time. This is the easiest way to train your ear on a commute.
- Dictionaries and translators. Many dictionary apps and Google Translate let you download a language so you can look words up without a signal. Quality is lower than the online versions, so treat it as a lookup tool.
- Books. A textbook, a grammar reference or a graded reader never needed a connection in the first place.
What is hard to do offline?
Talking. Most apps that offer AI conversation send your voice or text to a server and wait for the answer, so the conversation stops when the signal does. Their offline modes tend to cover review: replaying lessons you already downloaded, or working through exercises with fixed answers. That is useful, but it is not the same as practising speech that nobody scripted. Check what an app's offline mode actually includes before you count on it for a trip.
Does Duolingo work offline?
Partly. Offline lessons are limited to some content, and its AI conversation features run in the cloud, so they need a connection. Plans and features change, so check Duolingo's own site for the current details. We wrote a longer, fair comparison in Sayelle vs Duolingo.
Can an AI tutor run entirely on your phone?
Yes, though it comes with trade-offs. Sayelle runs its tutor, speech recognition and voice on the phone, so a spoken conversation works in airplane mode after a one-time download of about 4 GB. The trade-offs are real. You need a fairly recent phone, with iOS 18 or later on iPhone, or Android 8.0 or later and 8 GB of memory or more recommended. The on-device model is smaller than the biggest cloud models, so it can make mistakes. It teaches nine languages, so it will not cover everything. The details are in how an offline AI tutor works.
How do you choose?
Start with what you actually need to do offline:
- Review vocabulary? A flashcard app is enough, and the free ones are very good.
- Train your listening? Download podcasts or audio courses in your target language.
- Practise speaking? You need something that answers you without a server. An on-device AI tutor is one option.
- Travel somewhere with patchy signal? Download a dictionary language pack too, and save anything you will need before you leave.
What does a simple offline plan look like?
Before a flight or trip, with Wi-Fi: download your flashcard deck, two or three podcast episodes, a dictionary pack and, if you use one, the offline models and lessons for your tutor. Then, wherever you are: review cards for five minutes, listen to one episode, and spend ten minutes speaking with the tutor. That covers reading, listening and speaking without needing a connection once.
Try it on your phone
Sayelle is free to start, on iPhone and Android. Conversations with the tutor are free and unlimited.
