An app that worked fine yesterday and now crashes the moment you open it — right after an iOS update — is one of the most common complaints after any major iPhone software release. The frustrating part is that it’s rarely your fault and rarely permanent: it’s almost always a compatibility gap between the app’s old code and the new iOS version, and there’s a clear order of fixes that resolves the vast majority of cases without losing anything.
Quick Decision Guide
| What’s happening | Start here |
|---|---|
| Just one specific app crashes, everything else is fine | Jump to Just One App Crashing |
| Several or all apps started crashing after the same update | Jump to Multiple Apps Crashing At Once |
| The app crashes the instant it opens, before you can do anything | Jump to Instant Crash On Launch |
| It crashes only after a while, or only during a specific action | Jump to Crashes During Use, Not On Open |
Just One App Crashing
If it’s isolated to a single app, the cause is almost always that the app itself hasn’t been updated to work properly with the new iOS version yet — this is normal and developers usually push a fix within days. Check first:
- Open the App Store, tap your profile icon (top right), then App Updates — install anything pending for that app specifically.
- If it’s already up to date, delete and reinstall it: press and hold the icon, tap Remove App > Delete App, then reinstall from the App Store. This replaces any corrupted local files without touching your account or cloud-saved data.
- Check the app’s own permissions at Settings > [App Name] — updates sometimes reset permissions, and an app missing a permission it expects (Camera, Photos, Location) can crash instead of just showing an error.
Multiple Apps Crashing At Once
When several unrelated apps all start crashing right after the same update, the cause is more likely something at the iOS level rather than each individual app. Work through these in order:
| Fix | What it addresses | Time |
|---|---|---|
| Restart the iPhone | Clears temporary memory/cache issues left over from the update process itself | 1 min |
| Free up storage | iOS needs free space to run apps properly; many crashes are actually low-storage crashes misread as update bugs | 5 min |
| Reset Settings (not Reset All Content) | Resets Wi-Fi passwords, display settings, and permission states to defaults — fixes corrupted permission/settings databases without touching your data | 2 min + re-enter Wi-Fi passwords |
| Wait 48-72 hours | Background indexing/optimization after a major iOS update can cause temporary instability across many apps for a day or two | Passive |
Reset Settings specifically (found at Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings) is worth calling out: it sounds drastic but doesn’t delete any apps, photos, or data — it only resets system preferences back to default, which is exactly the kind of corruption a botched update can leave behind.
Instant Crash On Launch
If the app closes the moment you tap it — sometimes so fast you only see a flash — before any screen even loads, this points to either a corrupted app install or a permission conflict, not a bug inside the app’s actual logic. Delete and reinstall first (this fixes the majority of instant-crash cases), and if it still happens immediately after a clean reinstall, the app genuinely hasn’t been updated for the new iOS version yet and you’ll need to wait for the developer.
Crashes During Use, Not On Open
If the app opens fine but crashes later — during a specific action like opening the camera, scrolling a feed, or saving something — this is more often a storage or memory problem than a compatibility one:
- Check Settings > General > iPhone Storage — under 1-2GB free space causes exactly this pattern of “works at first, crashes mid-task.”
- Close other apps running in the background if you were multitasking heavily right before the crash.
- Check if Background App Refresh is enabled for that app (Settings > General > Background App Refresh) — on older iPhones this can starve the active app of memory after an update changes how iOS allocates resources.
Will Reinstalling Lose My Data?
| Type of app | What happens on delete + reinstall |
|---|---|
| Apps with cloud accounts (social media, email, streaming) | Nothing lost — log back in and everything syncs from the server |
| Apps with iCloud-backed local data (some note apps, games) | Restores automatically if iCloud sync was already on |
| Apps with purely local data and no account system | That data is genuinely gone — check the app’s own settings for an export/backup option before deleting |
If It’s Specifically the Camera, Messages, or Another Built-In Apple App
Built-in apps can’t be “reinstalled” the normal way, but you can reset them: offload the app (Settings > General > iPhone Storage > find the app > Offload App), then reinstall it from the same screen. This works for Camera, Mail, Music, and most other stock apps without losing any of your actual data, since it’s stored separately from the app itself.
When To Just Wait It Out
If the crash started within 24-48 hours of a major iOS version release (a full number jump like iOS 17 to 18, not a small point update), and it affects a popular third-party app, checking the developer’s own support Twitter/X account or their app’s App Store reviews from the last day or two will usually confirm thousands of other people have the exact same issue and a fix is already in progress. In that specific situation, waiting genuinely is the correct first move rather than troubleshooting your own phone.
Frequently Asked Questions
Does deleting and reinstalling an app delete my account on that service?
No. Your account lives on the app developer’s servers, not on your phone. Deleting the app only removes the local copy and any data that wasn’t backed up to your account.
Why does Reset All Settings not delete my photos or apps?
Because “settings” in iOS refers specifically to system preferences (Wi-Fi passwords, display brightness, privacy permissions) — it’s a completely separate category from your actual files, photos, and installed apps, which live in different storage areas entirely.
How do I know if it’s my phone or the app itself that’s the problem?
Check if the app is crashing for other people too by searching the app’s name plus “crashing” on social media or checking its recent App Store reviews. If many recent reviews mention the same crash, it’s the app’s fault, not your specific device.
Should I downgrade back to my old iOS version?
Apple makes this difficult and often impossible after a short window, and it’s rarely necessary — app compatibility issues after an iOS update are typically resolved by the app’s own update within days, which is a much simpler fix than downgrading an entire operating system.
My iPhone is older — could it just be too old for the new iOS?
Yes, this is a real factor. Apps optimized for the newest iOS features can run noticeably less stable on the oldest iPhone models still supported by that iOS version. If your phone is among the oldest still able to install the update, this is worth considering if the problem affects almost every app rather than just one or two.
Does offloading an app delete my saved data inside it?
No. Offloading removes only the app program itself while keeping its documents and data stored on your phone; reinstalling from the same screen restores everything exactly as it was.
Is there a way to see a list of recent crashes on my iPhone?
Yes — go to Settings > Privacy & Security > Analytics > Analytics Data and look for files starting with the app’s name (often containing “JetsamEvent” or the app name itself with a timestamp). This is mainly useful if you want to share crash details with a developer’s support team.
Can a VPN or ad blocker cause apps to crash after an update?
Yes, occasionally. Content-filtering or VPN apps that modify network traffic can conflict with how an updated app expects to communicate with its servers. If the crashing app needs internet access, try temporarily disabling any VPN or content blocker to rule this out.
Why did this only start happening days after I updated, not immediately?
Some crash causes are triggered by accumulated cache or by a specific action (like the app trying to sync background data) rather than the update itself, so the first crash can be delayed until you happen to trigger that specific code path for the first time post-update.
Will Apple compensate me if a paid app keeps crashing and I can’t use it?
You can request a refund directly from Apple for a paid app that’s unusable due to crashes — go to reportaproblem.apple.com, find the purchase, and select “request a refund,” citing that the app is not functioning as expected.