Most storage cleaner apps for Android have one thing in common: they want something from you. An upgrade to remove ads, a subscription to unlock the scan, permission to upload your file list to a server. This comparison covers five apps that actually work, what each one does well, and where each one falls short.
No sponsored placements. No invented scores.
The five apps
| App | Free? | Ads? | Duplicate detection | Image compression | Internet required | |---|---|---|---|---|---| | FreeMemory | Yes | No | Yes (MD5) | Yes (JPEG) | No | | Files by Google | Yes | No | No | No | Optional | | CCleaner | Free tier | Yes | No | No | Yes | | SD Maid | Free + paid | No (paid) | Partial | No | No | | Dumpster | Free + paid | Yes (free tier) | No | No | No |
FreeMemory
Best for: duplicate photos, image compression, users who don't want any ads or tracking.
FreeMemory scans for duplicate files (exact match via MD5), large images and videos, screenshots, and JPEGs that can be compressed. Everything runs on-device — the app has no internet permission, so it physically cannot send your data anywhere.
What it does not do: general file browsing, app management, RAM optimization, or system cache clearing beyond what the Android API exposes to non-root apps.
Where FreeMemory wins: it is the only app on this list that combines zero ads, zero internet access, and actual duplicate photo detection.
Where it falls short: the file browser is limited to the cleaner views. If you need to move files around or access a folder tree, you need a separate app.
Download FreeMemory free on Google Play
Files by Google
Best for: everyday file management, general storage cleanup, users who want a Google-trusted app.
Files by Google is a file browser first and a storage cleaner second. It identifies "junk" files — temp files, residual APKs, meme folders — and offers to delete them in one tap. The UI is polished and the app is actively maintained.
Where Files by Google wins: it is the better general-purpose file manager. The folder browsing experience, the search, and the share-nearby feature are all more capable than FreeMemory.
Where it falls short: no duplicate photo detection, no image compression. If your storage problem is hundreds of duplicate vacation photos, Files by Google will not find them.
CCleaner for Android
Best for: users who want junk cleaning plus app management in one place.
CCleaner on Android does junk cleaning, cache clearing, app hibernation, and RAM monitoring. The free version is functional. The paid version removes ads and adds scheduled cleaning.
Where CCleaner wins: the broadest feature set of any free option. App management and battery monitoring are features FreeMemory does not have.
Where it falls short: the free tier shows ads, and the RAM boost feature is misleading — Android manages its own memory and apps that claim to "boost RAM" do not meaningfully improve performance. CCleaner also requires internet access.
SD Maid
Best for: power users, especially on rooted devices.
SD Maid has two versions. The free version handles basic corpse file cleanup (leftover data from uninstalled apps). SD Maid Pro adds deeper system cleaning, a file explorer, and a duplicate finder that goes beyond exact-match. On a rooted device, SD Maid Pro can access parts of the file system that no other cleaner can touch.
Where SD Maid wins: for rooted power users, nothing on this list competes with SD Maid Pro. The system-level access on rooted devices is genuinely useful.
Where it falls short: the free version is limited. Getting the full value requires buying Pro. Non-rooted users get less benefit than rooted ones.
Dumpster
Best for: users who want an undo option after deleting files.
Dumpster is not really a storage cleaner — it is a recycle bin for Android. Files you delete go to Dumpster first, and you can restore them within a window. This is the only app here that gives you a safety net for accidental deletions.
Where Dumpster wins: if you want to recover files you deleted by mistake, Dumpster is the right tool.
Where it falls short: Dumpster does not help you find what to delete — it just holds what you have already deleted. The free tier shows ads and limits restore capacity.
Which one to install
If your problem is duplicate photos → FreeMemory. It is the only free app here with exact-match duplicate detection and no ads.
If your problem is general clutter and file management → Files by Google. Better file browser, trusted developer, actively updated.
If you want the most features in one app and don't mind ads → CCleaner free tier. Just ignore the RAM boost numbers.
If you have a rooted device and want deep system cleaning → SD Maid Pro.
If you delete things by accident → Dumpster.
You can run more than one. FreeMemory for duplicates and compression, Files by Google for everyday file browsing — they do not conflict.