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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWhen one iPhone app crashes, hangs, or refuses to open, work from least destructive to most destructive: force-close that app and reopen it, restart the iPhone, install app and iOS updates, then delete and redownload the app only after checking whether its local data is backed up. If the same app still fails, the developer is the right escalation point. When several apps or the entire phone are slow, investigate the network, storage, Low Power Mode, and temperature instead of repeatedly quitting apps.
Start with the least risky fix
The order matters because the first steps do not remove app documents or downloads. Test the app after every step so you know which change solved the problem.
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- Close and reopen the affected app. On a current iPhone, open the App Switcher, locate the app’s preview, and swipe up on that preview. Then launch the app normally. On an iPhone with a Home button, double-click the Home button to open the App Switcher, find the app, swipe up on its preview, and reopen it.
- Restart the iPhone. Use the iPhone’s normal shut-down and restart controls, wait for the phone to finish booting, and try the app again. A restart can clear a temporary process or memory condition without touching the app’s stored documents.
- Check for updates. Open the App Store, tap the account or profile area, and look for available app updates. If the app has no update, open Settings and check for an iOS update under the software-update controls. Labels and update locations can vary by iOS release and region.
- Delete and redownload only if necessary. Before removing the app, identify anything stored only on the iPhone: unsynced work, downloaded media, offline maps, game progress, or files that are not visible in a cloud account. Deleting an app can remove its related data. If you proceed, delete the app, download it again from the App Store, sign in if required, and test it before restoring optional downloads.
- Contact the app developer if the failure continues. The developer can investigate an app-specific bug, service outage, account problem, or compatibility issue that Apple’s general troubleshooting cannot resolve. If you recently purchased the app and no longer want it because it does not work for you, Apple also provides a refund-request process.
Do not routinely force-close every app. iPhone automatically manages apps in the background, and Apple says quitting apps that are not unresponsive does not extend battery life. Quit an app when it is actually stuck; otherwise, leave it in the background.
First decide whether the problem is isolated
Knowing the scope prevents you from applying a destructive fix to the wrong problem. Use this quick diagnostic before moving beyond the first two steps.
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| What you observe | Most useful interpretation | Next check |
|---|---|---|
| One app closes, freezes, or will not open while other apps work | An app-specific process, update, account, or compatibility problem is more likely | Close and reopen, restart, update that app, then contact its developer if needed |
| Several apps are slow or failing | The iPhone, network, storage, or operating-system state may be involved | Check the connection, available storage, iOS updates, Low Power Mode, and temperature |
| The app fails only when loading online content | A weak or congested connection, or a service-side outage, may be involved | Try Wi-Fi or another location and test again |
| The app fails even with no network-dependent action | The app itself, its local data, or iOS may be responsible | Complete the restart and update steps before considering deletion |
| The entire iPhone is sluggish or unresponsive | This is broader than a single app crash | Check storage, network conditions, Low Power Mode, and device temperature |
This is a practical way to choose the next step, not a published diagnostic test. A particular app’s outage, defect, or compatibility status cannot be determined without the app name and current developer notices.
How to close and reopen a frozen app
Current iPhones without a Home button
- Swipe up from the bottom edge and pause in the middle of the screen to open the App Switcher.
- Swipe left or right until you see the affected app.
- Swipe up on the app’s preview to remove it from the App Switcher.
- Return to the Home Screen or App Library and tap the app icon.
If the preview will not move, the whole phone may be frozen rather than just the app. In that case, wait briefly and then use the iPhone’s normal restart procedure.
iPhones with a Home button
- Double-click the Home button to open the App Switcher.
- Find the unresponsive app.
- Swipe up on its preview, then open the app again.
Removing a preview is a temporary process reset. It does not update the app, repair damaged data, or resolve a service outage, so continue to the next relevant check if the symptom returns.
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Restart the iPhone before changing app data
A restart is the safest broad fix after force-closing. It reloads iOS services and gives the app a fresh launch without deleting documents, settings, or downloads. After the phone has restarted, open the problem app by itself and check whether it reaches its normal home screen.
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If the phone cannot respond to normal controls, use Apple’s model-specific forced-restart instructions rather than repeatedly tapping the frozen app. The exact button sequence depends on the iPhone model; do not guess a sequence that could trigger another function such as Emergency SOS.
Install app and iOS updates
Update the app
Open the App Store and tap the account/profile area. Review the available updates list and install the update for the affected app, or use the store’s update-all option if you have verified that you have enough storage and a reliable connection. Reopen the app after installation. An update may include a crash fix, a server-compatibility change, or support for a newer iOS version.
Update iOS when no app update is available
If the App Store offers no update for the app, check Settings for an available iOS update under the software-update section. Keep the iPhone connected to power when practical and allow the installation to finish before testing the app. Store labels, update timing, and availability can differ by iOS version and region.
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Updating is not a guarantee: an app can remain broken because of a developer defect, a temporary outage, an account issue, or an incompatibility that the developer has not yet addressed.
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Delete and redownload without losing what matters
Check for local-only data first
Deleting an app is the first step in this sequence that can remove information. Before you do it, ask:
- Is recent work synchronized to the app’s account or cloud service?
- Are downloaded songs, videos, maps, podcasts, or documents replaceable?
- Does the app keep progress or settings only on this iPhone?
- Can you sign back in, and do you have the required password or passkey?
- Is there an in-app export or backup option you can use while the app still opens?
If you cannot answer these questions, try the network, storage, restart, and update checks first, and contact the developer before deleting the app.
Understand Offload App versus Delete App
| iPhone action | What it removes | What it keeps | When it helps |
|---|---|---|---|
| Offload App | The app software itself | The app’s documents and data | Freeing storage while preserving local data for a later reinstall |
| Delete App | The app and its related data | Nothing the app stored locally unless it was separately synchronized or backed up | A clean redownload when an app installation or local files may be damaged |
You can review these choices at Settings > General > iPhone Storage. Depending on the app, iOS may also expose individual documents or data that can be removed separately. Offloading is less destructive, but it is not a complete reset if the problem is in the retained documents or settings.
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- Confirm that important data is synchronized, exported, or otherwise recoverable.
- Delete the app only after accepting the possibility of local-data loss.
- Download it again from the App Store.
- Open it before restoring optional downloads, add-ons, or large offline libraries.
- Sign in and test the original action that triggered the crash or freeze.
If the fresh installation works until you restore a particular file or download, that item may be corrupt or unsupported; ask the developer how to recover it safely.
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When the whole iPhone is slow or several apps misbehave
Check the network, not just the signal icon
Many apps need an internet connection. A strong-looking signal does not rule out congestion between your phone and the service. Apple recommends waiting briefly, trying another location, or switching to Wi-Fi. Test the app again after the connection changes. If only online screens fail while offline features work, the service or connection deserves attention before you reinstall anything.
Keep at least 1 GB of free storage
Open Settings > General > iPhone Storage and review the available space. Apple recommends maintaining at least 1 GB free to help avoid slowdowns. iOS can automatically manage space during app installations and updates by removing items that can be downloaded again or are no longer needed, but you should not rely on that behavior when storage is nearly full.
Use the storage screen to identify large apps, media, and downloads. Remove replaceable items first, and verify that important photos, files, and app data exist elsewhere before deleting them.
Check Low Power Mode
Low Power Mode can make some features work more slowly. If the entire phone feels sluggish, check whether it is enabled and test again after normal power conditions return. This is a secondary performance check, not a guaranteed explanation for one app that crashes immediately.
Let an overheated or very cold phone return to normal temperature
Extreme device temperature can reduce performance. Move the iPhone away from direct heat or severe cold, avoid demanding use while it returns to a normal temperature, and then retry the app. Temperature-related slowness usually affects the device more broadly than a single app.
What persistent failure usually means
If one app still crashes after a close-and-reopen, restart, and current updates, the remaining causes are often specific to that app’s code, account, content, backend service, or compatibility. Apple’s general steps cannot identify which one applies. Look for an in-app status message or the developer’s support channel, and provide the app version, iOS version, iPhone model, exact action that triggers the failure, and whether it happens on both Wi-Fi and cellular data.
For privacy, do not send passwords, authentication codes, payment details, or private documents in a crash report. A screen recording or crash time can help the developer, but include only information you are comfortable sharing.
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A compact decision path
- One app only? Force-close it and reopen it.
- Still broken? Restart the iPhone.
- Still broken? Update the app, then iOS if no app update exists.
- Still broken and data is safe? Consider Offload App first; use Delete App and redownload only when a clean installation is justified.
- Still broken? Contact the developer, and request a refund from Apple if a recent purchase qualifies and you no longer want it.
- Several apps or the phone itself are slow? Check network conditions, keep at least 1 GB free, and review Low Power Mode and temperature.
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