How Slean handles your photos
Slean sorts, scans, groups, filters, compresses and edits your photos on your phone. Your library is not uploaded to a Slean server to be cleaned, there is no account, and the app shows no ads and carries no advertising or analytics trackers.
Why the phrase “on-device” is not enough
Nearly every photo cleaner says it processes photos on the device, and most of them mean it. What differs is everything around the processing — an app can analyse your library locally and still show ads, carry an advertising SDK, require an account and report what you do to an analytics service.
So the claim worth making is the narrower, checkable one: no data collected, no ads, no trackers, no account.
The boundary, stated exactly
On the device: reading your library, finding duplicates, grouping near-identical shots, every filter, deletion, compression, crop, resize, collage and Pixel Stretch.
Never: sold, shared, or used to build a profile of you. Slean has no advertising SDK, no analytics on your behaviour, and no account to attach any of it to.
How to check this yourself
Open Slean's App Store listing and scroll to App Privacy. Every developer has to declare there what their app collects, in a format Apple sets rather than one the developer writes.
Do the same for any cleaner you are considering. It takes a minute per app, and it tells you more than a comparison article will — including the ones on this site.
- Most photo cleaner apps don't upload your photos, but that isn't the whole questionMost cleaners process photos on the device and never upload them. But local processing and data collection are two different things — here's how to tell them apart.
- Photo cleaner apps raise two different safety questions, not one"Safe" usually means two different things: will it leak your photos, and will it delete something you wanted. The answers, and the risks, are not the same.
- Finding a photo cleaner that doesn't run on ads and trackersThe photo cleaner category is unusually ad-heavy. Here's why, what comes bundled with an ad-supported cleaner, and the checks that find one that isn't.
- How to read the privacy label on a photo cleaner's store listingPrivacy labels are developer-declared, not audited — but they're still the fastest real check on any app. What each term means and what to look for.
- How to clean up your photos without uploading them anywhereThe iPhone and Android's own tools already do this locally. For a third-party cleaner, the airplane-mode test is how to check — and it takes thirty seconds.
The formal document is the privacy policy. It is short.
