iPhone (iOS) · Troubleshooting
View Crash and Diagnostic Reports
Every app crash or system hang on iPhone generates a diagnostic log you can view directly on the device, useful for troubleshooting a misbehaving app yourself or sharing details with a developer or support team.
How to open Diagnostic Log
- Open Settings → Privacy & Security → Analytics & Improvements → Analytics Data.
- Scroll or search for the log matching the app and approximate crash time.
- Tap the log entry to view its contents.
- Tap the Share icon to export it via Mail, Messages, or Files if a developer requested it.
What you should know
- Logs are listed by app name and timestamp, newest first.
- Each log can be opened, viewed as text, and shared via Mail, Messages, or Files.
- Logs include technical details like the crash type, memory state, and process being run at the time.
- Older logs are automatically cleared after a period of time or once storage is needed elsewhere.
Diagnostic logs contain technical crash details, not personal file contents, but developers sometimes ask for them by name — know how to locate and share the right one quickly.
Why it matters
When an app crashes repeatedly and support asks 'do you have the crash log,' this is exactly where to find it — without it, developers are often diagnosing blind. Being able to locate and share a specific diagnostic log can turn a vague bug report into a fixable one much faster.
Best practices
- Note the approximate time an app crashed so you can quickly find the matching log afterward.
- Share the specific log file rather than a screenshot when a developer requests crash details, since the raw log has far more diagnostic information.
- Periodically clear old logs you no longer need if you're manually managing device storage closely.
Common problems and fixes
- Can't find a log for an app that just crashed
- Reopen the app once to let iOS finish generating the log, then check Analytics Data again after a minute or two.
- The log list is very long and hard to search through
- Logs are typically sorted newest-first and named after the app, so scroll from the top or use the search field if available for your iOS version.
Tips and tricks
- If an app keeps crashing, export a handful of its recent logs at once rather than just one, since a pattern across logs can reveal the real cause faster.
Frequently asked questions
Do diagnostic logs contain my personal photos or messages?
No, they contain technical crash and performance data about the app or system process, not the content of your personal files.
Can I delete diagnostic logs manually?
iOS manages log retention automatically, though you can share and then ignore ones you don't need — there isn't always a direct manual delete option for individual logs.
Related settings
- Analytics & ImprovementsAnalytics & Improvements controls whether your iPhone automatically sends anonymized crash reports and usage analytics to Apple, and optionally to third-party app developers, to help diagnose problems and improve software.
- Battery Health & ChargingBattery Health & Charging shows your battery's Maximum Capacity as a percentage of its original capacity, its Peak Performance Capability status, and charging optimization options — the key diagnostic info for battery-related complaints.
- General & AboutThe About screen lists identifying and technical details about your iPhone — name, iOS version, model and serial numbers, storage capacity, and carrier information — that support staff and other apps often need.
More Troubleshooting guides for iPhone (iOS)
- Reset iPhoneReset options let you fix persistent software issues by resetting specific settings (like network or keyboard dictionary) or fully erase the device back to factory defaults.
- Recovery Mode & RestoreRecovery Mode is a special startup state used with a computer running Finder (or iTunes on older systems) to reinstall or restore iOS when an iPhone is frozen, stuck on the Apple logo, or won't update normally.
- Force Restart & Shut DownA force restart or full shut down can resolve a frozen or unresponsive iPhone using a physical button sequence, without needing to reach Settings at all.
- Erase All Content and SettingsErase All Content and Settings permanently deletes everything on the iPhone, including apps, photos, settings, and accounts, restoring it to an out-of-box state, distinct from resetting individual settings categories.
- DFU Mode RestoreDevice Firmware Update (DFU) Mode is the lowest-level restore state available on iPhone, used when the device won't respond to a force restart or standard Recovery Mode, typically requiring a computer with Finder or iTunes.
- Temperature Warnings & OverheatingiPhone displays an on-screen warning and can temporarily limit performance, charging, or camera flash when it gets too hot or too cold, protecting the battery and internal components until it returns to a safe operating range.