How to See Storage Usage by App on iPhone
To see storage usage by app on iPhone, open Settings > General > iPhone Storage and wait a few seconds for the bar chart and per-app list to load; the list is sorted largest-first, so the apps eating the most space sit right at the top. This guide is for anyone who keeps hitting "Storage Almost Full" and wants to know exactly which apps are responsible before deleting anything.
TL;DR
- The full breakdown lives in Settings > General > iPhone Storage — apps are auto-sorted by size, biggest first.
- Tap any app to see its App Size (the app itself) versus Documents & Data (your downloads, caches, and saved media).
- The colored bar at the top splits usage into Photos, Apps, Media, System Data, and more so you can scan categories at a glance.
- "System Data" and "Other" can look huge and aren't an app you can open directly — that's normal and often temporary.
- iOS surfaces the numbers but won't clean inside an app for you; tools like Cleanor help you act on the photo and duplicate side that usually dominates the list.
Where is the iPhone storage breakdown screen?
Apple keeps the real numbers in one place. Here's how to get there:
- Open Settings.
- Tap General.
- Tap iPhone Storage.
- Wait 5–20 seconds for the chart to finish calculating.
The screen has two parts. The colored bar at the top groups everything into categories — Photos, Apps, Media, Mail, Messages, System Data, and free space. Below it is the per-app list, ranked from largest to smallest. That list is the fastest way to answer "what is using my storage?" without guessing.
If the bar is stuck on a gray "Calculating…" placeholder, lock the phone, leave it on a charger for a few minutes, and reopen the screen. The estimate finalizes once iOS finishes indexing.
How do I read the per-app list?
Each row shows the app name and a single number — its total footprint. But that number combines two very different things, and you only see them when you tap in.
- In iPhone Storage, tap any app (try the one at the top).
- Read the two values: App Size and Documents & Data.
- Note the last-used date if shown — handy for spotting apps you've forgotten.
| What you see | What it means | Can you clear it? |
|---|---|---|
| App Size | The app's code and built-in assets | Only by deleting/offloading the app |
| Documents & Data | Downloads, caches, attachments, saved media | Often yes, inside the app's own settings |
| Total (list number) | App Size + Documents & Data | The combined figure shown in the list |
The big realization for most people: a 200 MB app showing 6 GB total isn't a bloated app — it's 5.8 GB of Documents & Data, usually downloaded videos, message attachments, or cached media. That's where the easy wins are. For the deeper version of this distinction, see our explainer on what app cache is and when it's safe to clear.
What do Offload and Delete actually do?
When you tap into an app, iOS gives you two buttons. They are not the same, and the difference matters.
- Offload App removes the app's binary but keeps its Documents & Data. Reinstall it later and your data returns. This reclaims the App Size only.
- Delete App removes the app and all of its Documents & Data. This frees the full total, but you lose anything stored only in that app.
| Action | Frees App Size | Frees Documents & Data | Keeps your data |
|---|---|---|---|
| Offload App | Yes | No | Yes |
| Delete App | Yes | Yes | No |
You can also let iOS offload automatically. Go to Settings > App Store and turn on Offload Unused Apps. iOS then removes apps you haven't opened in a long time whenever space runs low, and restores them on demand. It's a safe, reversible setting for anyone who installs more than they use.
Why is Photos or System Data so big?
For most iPhones, the largest entry isn't an app at all — it's Photos, followed by System Data. Here's how to think about each.
Photos. Your camera roll, screenshots, and especially videos add up fast; a few minutes of 4K footage can run over a gigabyte. Tapping Photos in the storage list shows the breakdown and offers built-in suggestions. The most effective single move is enabling Settings > Apps > Photos > Optimize iPhone Storage, which keeps full-resolution originals in iCloud and lighter versions on the device. We cover the trade-offs in the truth about Optimize iPhone Storage and Google Photos.
System Data. Formerly called "Other," this is caches, logs, Siri voices, and temporary files iOS manages itself. It can swell to several gigabytes and shrink on its own. You can't open it like an app, and you shouldn't chase it too hard. For the full picture, read what System Data is and whether you can delete it.
Is it safe to delete apps from the storage screen?
Yes — the iPhone Storage screen is the safest place to delete apps because it shows you the cost and the reward before you commit, and Offload is fully reversible. Here's the honest breakdown of what each layer does.
What iOS does natively: it measures usage, sorts apps by size, separates App Size from Documents & Data, and lets you Offload (reversible) or Delete (permanent). It also auto-offloads unused apps if you opt in. That covers measurement and app-level action well.
What iOS cannot do: it won't reach inside an app to delete just the junk. If a messaging app is hoarding 8 GB of forwarded videos, iOS shows you the 8 GB but can't trim it — you have to open that app's own storage tools (see clearing WhatsApp and Telegram storage without losing chats). iOS also can't find duplicate or near-identical photos, which often quietly make up a large share of the Photos total.
What Cleanor adds: Cleanor focuses on the part the storage screen exposes but can't fix — your photo library. It scans for duplicate and visually similar shots, large videos, and screenshots, then lets you review and remove them in batches before they ever reach the trash. It does not — and cannot — delete other apps' internal data or touch System Data, and no app should claim it can. Think of the storage screen as the diagnosis and Cleanor as a focused tool for the biggest symptom.
FAQ
Why doesn't the per-app total match the storage used?
The per-app list counts third-party and most built-in apps, but categories like Photos, Media, Mail, Messages, and System Data are tracked separately in the colored bar. Add those in and the figures reconcile. The bar at the top is the true total.
How often does iPhone Storage update?
It recalculates each time you open the screen, but the estimate can lag right after you delete something. Give it a minute, or lock and reopen the phone, and the numbers will settle to the true value.
Can I see storage by app without going into Settings?
Not reliably. Settings > General > iPhone Storage is the authoritative source. Some apps show their own internal usage in their settings, but only iOS gives you the ranked, device-wide list.
Does offloading an app free up Documents & Data?
No. Offloading only removes the app's binary (the App Size) and keeps all Documents & Data so you can restore it instantly. To free the data too, you must delete the app or clear its data from inside the app.
Turn the breakdown into a real cleanup
Seeing the list is step one; acting on it is step two. Once you know whether the culprit is apps, message media, or photos, start with the highest-value target. For a structured plan, our guide on what to delete first when storage is full walks through the order that frees the most space with the least regret.
When the list points back at your photo library — as it usually does — that's where a focused tool helps most. See how Cleanor cleans up phone storage for the duplicate and large-media side, and Cleanor for iOS to do it directly on the device. The storage screen tells you the problem; the right next step turns that into gigabytes back.