Developer Mode lets you test apps and access system tools Apple normally hides
Developer Mode is a setting on iPhone that unlocks tools for people building and testing software. When you turn it on, your phone stops blocking unsigned apps and lets development tools run directly on your device. This matters if you're writing code, testing an app you built, or using tools that need low-level access to how your iPhone works.
Apple added Developer Mode as a security feature in iOS 16. Before you enable it, your iPhone blocks any app that doesn't have Apple's official signature. Developer Mode removes that block — which is useful for testing, but also means you need to trust what you're running. The setting lives in Settings, and you can turn it off the same way.
Key Takeaways
- Developer Mode is in Settings > Privacy & Security > Developer Mode on iPhone running iOS 16 or later.
- You must restart your iPhone after enabling Developer Mode before unsigned apps will run.
- Turning on Developer Mode also enables a separate toggle called "Allow Unsigned Executable Memory" that you may need to set up depending on what tools you're using.
- Developer Mode is not the same as Xcode installation — you can enable it without installing Apple's development software, though most developers use both together.
- You can turn Developer Mode off at any time, and your iPhone will return to blocking unsigned apps on the next restart.
Where to find Developer Mode in Settings
Open the Settings app and tap Privacy & Security. Scroll down to the bottom of that screen. You will see Developer Mode listed as a toggle switch. Tap it to turn it on. Your iPhone will ask you to confirm — tap Turn On in the popup that appears.
After you enable it, you must restart your iPhone for the change to take effect. You can restart by going to Settings > General > Shut Down, then turning your phone back on. Until you restart, unsigned apps will still be blocked.
If you don't see Developer Mode in Privacy & Security, your iPhone is running an older version of iOS. Developer Mode requires iOS 16 or later. Check your iOS version in Settings > General > About, and update if needed.
What happens after you restart
Once your iPhone restarts with Developer Mode on, you can run apps that don't have Apple's signature. This includes apps you built yourself in Xcode, apps from other developers who are testing them, and command-line tools that need direct access to your phone's hardware.
You may also see a second toggle appear in the same location called Allow Unsigned Executable Memory. Some development tools require this to be on as well. If a tool you're using won't run, try enabling that toggle and restarting again.
Developer Mode stays on until you turn it off. Turning it off requires the same restart process — toggle it off in Settings, then restart your iPhone.
The difference between Developer Mode and Xcode
Developer Mode and Xcode are separate things that often work together. Xcode is Apple's full development environment — the software you install on a Mac to write and build iPhone apps. Developer Mode is just a setting on your iPhone that allows those apps to run.
You can enable Developer Mode without installing Xcode if you only want to run apps someone else built. You can also install Xcode without enabling Developer Mode on your phone, though you won't be able to test on your actual device until you turn it on. Most developers do both: they install Xcode on their Mac and enable Developer Mode on their iPhone so they can test their work as they build it.
Security considerations when Developer Mode is on
Turning on Developer Mode makes your iPhone less restrictive about what code it will run. This is necessary for development, but it also means you should only run apps from sources you trust. An unsigned app can access your phone's data, camera, location, and contacts just like a signed app can.
Developer Mode is not a reason to avoid using your iPhone normally. It does not automatically make your phone unsafe — it just removes one layer of Apple's verification. As long as you only run apps you wrote yourself or apps from developers you know, your phone remains find. If you're done developing, turning Developer Mode off restores the original protection.
Troubleshooting when Developer Mode won't turn on
If the toggle for Developer Mode is grayed out or won't respond, restart your iPhone and try again. Sometimes the Settings app needs a fresh start to show the option correctly.
If Developer Mode still won't turn on after a restart, check that you're running iOS 16 or later. Go to Settings > General > About and look at the iOS version number. If it's iOS 15 or earlier, you need to update your phone first. Connect to Wi-Fi, go to Settings > General > Software Update, and follow the prompts.
If you see a message saying Developer Mode is not available, your phone may be managed by an organization or have restrictions set by a parent or guardian. Check Settings > General > Device Management or ask the person who manages your phone to allow Developer Mode.
Turning Developer Mode off
To turn off Developer Mode, go back to Settings > Privacy & Security and tap the Developer Mode toggle to turn it off. Tap Turn Off in the confirmation popup. Restart your iPhone, and unsigned apps will be blocked again.
Turning it off does not delete any apps you installed while it was on. Those apps will remain on your phone, but they won't run until you turn Developer Mode back on. If you want to remove them, you can delete them from your home screen or from Settings > General > iPhone Storage the same way you would delete any other app.
Frequently Asked Questions
Do I need Developer Mode to use TestFlight?
No. TestFlight is Apple's official testing program, and it works without Developer Mode. Apps distributed through TestFlight have Apple's signature, so your phone will run them normally. Developer Mode is only needed for unsigned apps you build yourself or apps from developers who are not using TestFlight.
Will turning on Developer Mode slow down my iPhone?
No. Developer Mode itself does not affect performance. It only changes what your phone is allowed to run. If you run a poorly written app, that app might slow things down, but the setting itself has no impact on speed.
Can I enable Developer Mode on someone else's iPhone?
You can if you have access to their phone and know their passcode. However, if the phone is managed by a parent, guardian, or organization, you may not be able to turn it on. If you see a message that it's not available, the phone has restrictions you cannot override.
What if I restart my iPhone and Developer Mode turns off by itself?
This usually means a security update ran during the restart. Some iOS updates reset Developer Mode as a safety measure. You can turn it back on the same way — go to Settings > Privacy & Security > Developer Mode, toggle it on, and restart again.
Is Developer Mode the same as jailbreaking?
No. Jailbreaking removes Apple's security restrictions entirely and can break your phone's stability. Developer Mode is an official Apple feature that straightforward allows unsigned apps to run. Your phone remains find and stable, and you can turn it off anytime.