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Guides
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How to Check Whether a Cleaner App Is Uploading Your Photos
Four tests you can run yourself, in about ten minutes, on any app in the App Store. No technical background needed, and no need to trust anyone’s marketing copy — including ours.
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iPhone Cleaner Apps and the Subscription Trap
Why a task that finishes is sold by the week, what it costs over one, two and five years, and how to find and cancel a subscription you don’t remember starting.
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Recently Deleted: Why Your Storage Didn’t Go Down
You deleted thousands of photos and the number barely moved. Here is where they went, how long iOS keeps them, and the other four reasons storage stays stubborn.
Photos
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How to Find and Delete Duplicate Photos on iPhone
The Duplicates album iOS already has, why it often reports nothing, where duplicates come from in the first place, and the four ways people delete the copy they meant to keep.
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Similar Isn’t Duplicate: Why iOS Only Finds Half Your Redundant Photos
What perceptual hashing is in plain language, why bursts hide the size of the problem, and why the round trip through a chat app leaves you two files that are not the same.
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Live Photos Are Quietly Costing You Gigabytes
Every one carries a three-second video. What that costs, why turning “Live” off in the editor saves nothing at all, and the setting that stops the camera making more.
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How to Hide Photos on iPhone, and What “Hidden” Really Means
The Hidden album solves one problem properly and another not at all. Which is which, the locked-note trick nobody uses, and when you actually need encryption.
Space
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How to Compress a Video on iPhone Without Losing Quality
What 4K costs per minute in Apple’s own numbers, what a codec actually throws away, the free route through iMovie, and the camera setting that fixes the rest of the year.
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How to Find the Largest Files on Your iPhone
Reading the iPhone Storage screen properly, sorting Files by size, the videos Photos will not rank for you, and why nothing on earth can clear your System Data.
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iCloud Photos vs On-Device Storage: What “Delete” Actually Does
Two numbers, two problems, and one setting people believe solves both. Why optimising storage does nothing for your iCloud bill, and why sync is not backup.
Everything else
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How to Clean Up Duplicate Contacts on iPhone
The merge iOS already offers, why it finds so few, the difference between a linked contact and a duplicate one, and an honest note about the storage this does not free.
More coming
Two new guides a month. Next up: what “System Data” really is and whether you can reduce it, and a complete guide to freeing space on iPhone that ties all of these together. If there is something you would find useful, say so — info@syleniainc.com.
Each guide is written from how iOS and this app actually behave. If you would rather read about the app itself, every feature has its own page.