Duolingo caches lesson assets, audio clips, images, and downloaded course content that can grow to hundreds of megabytes. You can clear that storage on iPhone and Android without losing your streak or progress, because your account data is saved on Duolingo's servers.
Short answer:
- Android: go to Settings > Apps > Duolingo > Storage and tap Clear cache (safe). Clear storage logs you out.
- iPhone: there's no in-app cache button, so offload Duolingo via iPhone Storage or delete and reinstall it.
- Your streak, XP, and course progress are stored in your Duolingo account, so they survive a cache clear, just confirm you're signed in (not a guest).
Why Duolingo Uses Storage
Duolingo downloads and caches lesson content, character animations, illustrations, and audio for every exercise so lessons load and play instantly, even offline. As you progress through courses, that cached media accumulates.
On iPhone, check Settings > General > iPhone Storage > Duolingo, where the cache shows under Documents & Data. On Android, open Settings > Apps > Duolingo > Storage to see the Cache figure.
The reassuring part: this is disposable. Your streak, XP, achievements, and course progress live in your Duolingo account on its servers, so clearing the local cache loses none of your learning history.
Make Sure You're Signed In (Protect Your Streak)
Before clearing anything, confirm your progress is tied to an account and not just a local guest profile, this is the one thing that can cost you your streak.
Open Duolingo, tap Profile, and check that you're signed in with an email, Google, Apple, or Facebook account. If you only ever used Duolingo as a guest, create an account first so your progress syncs to the cloud. Once you're signed in and synced, clearing cache or reinstalling is completely safe.
Clear Duolingo Cache on Android (Safest)
Android gives you a clean cache clear that won't sign you out.
- Open Settings > Apps (or Apps & notifications).
- Tap Duolingo, then Storage (or Storage & cache).
- Tap Clear cache.
Only temporary lesson assets and media are removed. Duolingo redownloads them as you take lessons, so the app keeps working and you stay logged in. Your streak and progress are untouched. Repeat whenever the cache grows back.
Cache vs Clear Storage: Read Before Tapping
The second button on that Android screen is far more drastic, so be deliberate.
- Clear cache: removes temporary files only. Safe, keeps you signed in, keeps your streak.
- Clear storage / Clear data: wipes everything local and signs you out. If your progress is synced to an account, you'll get it back on login; a guest-only profile could lose its streak.
Use Clear cache for routine cleanup. Only use Clear storage if you've confirmed you're signed in and are ready to log back in.
Clear Duolingo Storage on iPhone
iOS has no per-app cache button, and Duolingo doesn't offer an in-app clear option, so you reset it from iOS to reclaim cached space.
Go to Settings > General > iPhone Storage > Duolingo:
- Tap Offload App to remove the app while keeping its data, then reinstall to clear the cache.
- Tap Delete App for a full wipe, then reinstall from the App Store and sign back in.
Because your progress lives in your Duolingo account, signing back in restores your streak, XP, and courses. Just make sure you're signed in (not a guest) before a full delete.
Keep Duolingo and Your Phone Lean
A simple habit keeps Duolingo's footprint small:
- Android: clear the cache from Storage every few weeks.
- iPhone: offload or reinstall Duolingo when Documents & Data balloons.
- Stay signed in so your progress always lives safely in the cloud.
Duolingo is one app among many, and the rest of your phone usually needs attention too. A review-first cleaner, Clenoir on iOS or Cleanor on Android, scans on-device and surfaces your largest videos and duplicate photos before you confirm any deletion. For a fuller plan, see the clean up phone storage hub and the storage cleanup FAQ. With the cache cleared, Duolingo keeps your streak alive and works exactly as before, minus the quiet storage creep.
Want the fast version? Cleanor for iPhone scans on-device — nothing uploaded — and surfaces your largest videos, duplicate photos, and heavy caches in one pass. For the full routine, see the free up phone storage guide.
FAQ
Will clearing the Duolingo cache reset my streak or progress?
No. Your streak, XP, achievements, and course progress are stored in your Duolingo account on its servers, so clearing the cache loses none of your learning history. The cache only holds disposable lesson assets, animations, illustrations, and audio.
What is the one thing that could cost me my Duolingo streak when clearing storage?
Using a guest-only profile. Tap Profile and confirm you're signed in with an email, Google, Apple, or Facebook account; if you only used Duolingo as a guest, create an account first so your progress syncs to the cloud before clearing cache or reinstalling.
What's the difference between Clear cache and Clear storage for Duolingo on Android?
Clear cache removes only temporary files, is safe, and keeps you signed in with your streak intact. Clear storage (Clear data) wipes everything local and signs you out; synced account progress returns on login, but a guest-only profile could lose its streak.