If you encounter “can not be opened because the developer can not be verified,” your macOS security settings are preventing the app from launching. This message pops up when Gatekeeper, Apple’s built-in security feature, blocks software that isn’t signed by an identified developer. It’s a common hurdle for Mac users downloading apps from outside the official App Store.
You might feel stuck when this error appears. Don’t worry. This guide walks you through every fix, from simple clicks to advanced terminal commands. By the end, you’ll open that app safely and understand why macOS blocks it in the first place.
What Does “Can Not Be Opened Because The Developer Can Not Be Verified” Mean?
macOS uses a system called Gatekeeper to protect your computer from malicious software. When you try to open an app, Gatekeeper checks its digital signature. If the developer hasn’t registered with Apple or the signature is broken, you see this warning.
This doesn’t always mean the app is dangerous. Many legitimate developers choose not to pay for Apple’s developer program. Open-source tools, indie software, and older apps often trigger this message. Still, you should always verify the source before bypassing security.
Common Scenarios Where This Error Appears
The error can show up in several situations:
- Downloading an app from a website instead of the App Store
- Opening a cracked or modified version of software
- Running an app from an external drive or USB stick
- Launching a tool that hasn’t been updated for the latest macOS version
Each case requires a slightly different approach. Let’s look at the quickest fix first.
Quick Fix: Right-Click And Open
The simplest way around this block is using the context menu. Instead of double-clicking, right-click the app and select “Open” from the dropdown. A new dialog appears with an “Open” button you can click.
This method adds the app to Gatekeeper’s exception list temporarily. Next time you open it normally, it should work without the warning. However, this only works for the current user account.
Step-By-Step Instructions
- Locate the app in Finder or your Downloads folder
- Right-click (or Control-click) the app icon
- Choose “Open” from the menu
- Read the warning dialog carefully
- Click the “Open” button to launch the app
This trick works about 80% of the time. If it doesn’t, move to the next solution.
Adjust Security & Privacy Settings
Sometimes macOS remembers your choice but still blocks the app. You can check your security settings to see if the app is listed there. This method gives you more control over what runs on your machine.
How To Allow Apps From Anywhere
Older versions of macOS had an “Anywhere” option in Security & Privacy. Apple removed this in recent updates, but you can still allow specific apps. Here’s how:
- Open System Settings (or System Preferences on older macOS)
- Click “Privacy & Security”
- Scroll down to the “Security” section
- Look for a message about the blocked app
- Click “Allow Anyway” next to the app name
- Enter your admin password to confirm
After this, try opening the app again. The warning should disappear. If you don’t see the “Allow Anyway” button, the app might not be in the list yet. Try the right-click method first to add it.
Use Terminal To Override Gatekeeper
For stubborn apps, the Terminal gives you direct control over file attributes. This method removes the quarantine flag that triggers the warning. It’s more technical but very reliable.
Removing The Quarantine Attribute
Every app downloaded from the internet gets a quarantine flag. This flag tells Gatekeeper to check the app. Removing it bypasses the check entirely.
- Open Terminal from Applications > Utilities
- Type:
xattr -d com.apple.quarantine(include the space at the end) - Drag the app file from Finder into the Terminal window
- Press Enter
- Enter your admin password if prompted
Now try opening the app normally. The warning should be gone. This method works for most apps, including those downloaded from torrents or direct links.
Alternative Terminal Command
If the first command fails, try this one:
sudo spctl --master-disable
This disables Gatekeeper entirely for all apps. Use it with caution. After running this command, you can open any app without verification. To re-enable Gatekeeper, run:
sudo spctl --master-enable
I recommend re-enabling it after you open the app you need. Keeping Gatekeeper off leaves your system vulnerable.
Check App Integrity And Source
Before you bypass security, make sure the app is safe. Malware often disguises itself as legitimate software. Take these steps to verify the file you downloaded.
Verify The Developer’s Identity
Look for these signs of a trustworthy app:
- The developer’s website has a professional design and contact information
- Other users have reviewed the app positively on forums or review sites
- The app is listed on trusted platforms like GitHub or SourceForge
- You downloaded it from the official developer site, not a third-party mirror
If anything seems off, don’t open the app. Delete it and find an alternative from the App Store or a verified source.
Scan With Antivirus Software
Run a virus scan on the downloaded file before opening it. Free tools like Malwarebytes for Mac catch most threats. Even if you trust the source, scanning adds an extra layer of safety.
Some malware specifically targets users who bypass Gatekeeper. A quick scan prevents headaches later.
Reinstall The App From A Trusted Source
Sometimes the downloaded file is corrupted or incomplete. Re-downloading the app from the official website often fixes the problem. Make sure you get the latest version compatible with your macOS.
Steps For A Clean Reinstall
- Delete the current app file from your Applications folder
- Empty the Trash to remove all traces
- Visit the developer’s official website
- Download the latest version of the app
- Try opening it with the right-click method
If the error persists, the app might be incompatible with your macOS version. Check the system requirements on the developer’s site.
Update MacOS To The Latest Version
Apple releases security updates that can change how Gatekeeper works. An outdated system might block apps that newer versions allow. Keeping your Mac updated reduces these conflicts.
How To Check For Updates
- Click the Apple menu in the top-left corner
- Select “System Settings” (or “System Preferences”)
- Click “General” then “Software Update”
- If an update is available, click “Update Now”
- Restart your Mac after the update completes
After updating, try opening the app again. The error might resolve itself with the new security policies.
Create An Exception For The App
macOS allows you to add specific apps to a whitelist. This tells Gatekeeper to trust the app permanently. The process varies slightly between macOS versions.
For MacOS Ventura And Later
- Open System Settings
- Go to “Privacy & Security”
- Scroll to the “Security” section
- Click the lock icon to make changes
- Enter your admin password
- Find the app under “Allow apps downloaded from”
- Select the app and click “Allow”
This method is more permanent than the right-click trick. The app will open without warnings until you remove it from the list.
Use A Different User Account
Gatekeeper settings can vary between user accounts on the same Mac. If you have another admin account, try opening the app from there. This isolates the issue to your primary account.
Creating A Test User Account
- Open System Settings
- Go to “Users & Groups”
- Click “Add Account”
- Choose “Administrator” as the account type
- Fill in the details and create the account
- Log out of your current account
- Log into the new account
- Try opening the app
If the app works in the new account, the problem is with your main account’s settings. You can reset your main account’s preferences or migrate to the new one.
Reset Gatekeeper Settings
Sometimes Gatekeeper’s database gets corrupted. Resetting it can fix persistent blocks. This requires Terminal commands, so follow carefully.
Resetting Gatekeeper
- Open Terminal
- Type:
sudo spctl --reset-default - Press Enter and enter your password
- Type:
sudo spctl --master-enable - Press Enter
- Restart your Mac
After the restart, try opening the app again. This resets Gatekeeper to its default settings, which might remove the block.
Check For Conflicting Software
Third-party security tools can interfere with Gatekeeper. Antivirus programs, firewalls, or system cleaners sometimes block apps incorrectly. Temporarily disable these tools to see if they’re causing the issue.
Common Conflicting Software
- Little Snitch
- Malwarebytes (real-time protection)
- Avast or Norton security suites
- CleanMyMac X
- Any VPN with network filtering
Disable each tool one at a time and test the app. If the app opens with a tool disabled, you found the culprit. Add an exception for the app in that tool’s settings.
Repair Disk Permissions
Corrupted file permissions can cause Gatekeeper errors. Repairing them might resolve the issue. This is a safe maintenance step that won’t affect your data.
Using Disk Utility
- Open Disk Utility from Applications > Utilities
- Select your startup disk (usually “Macintosh HD”)
- Click “First Aid” in the toolbar
- Click “Run” to start the repair
- Wait for the process to complete
- Restart your Mac
This checks and repairs the entire disk, including system files that Gatekeeper relies on. It’s a good idea to run this monthly anyway.
Boot Into Safe Mode
Safe Mode loads only essential system extensions. If the app opens in Safe Mode, a third-party extension or startup item is blocking it. This helps isolate the cause.
How To Boot Into Safe Mode
- Restart your Mac
- Immediately press and hold the Shift key
- Release the Shift key when you see the login window
- Log in (you might need to log in twice)
- Try opening the app
If the app works in Safe Mode, restart normally and disable startup items one by one. Find the one causing the conflict and remove it.
Reinstall MacOS Without Losing Data
As a last resort, reinstalling macOS can fix deep system issues. This doesn’t erase your files, but it replaces system files that might be corrupted. Always back up your data first.
Steps For Reinstalling MacOS
- Back up your Mac with Time Machine
- Restart and hold Command + R to enter Recovery Mode
- Select “Reinstall macOS” from the utilities window
- Follow the on-screen instructions
- Wait for the installation to complete
After reinstalling, test the app. The Gatekeeper error should be resolved. If not, the issue might be with the app itself, not your system.
Frequently Asked Questions
Why Does This Error Keep Appearing For Apps I Trust?
Gatekeeper checks every app’s signature each time you open it. If the signature is missing or invalid, the error appears. Even trusted apps from small developers often lack Apple’s approval. You can bypass it safely if you verified the source.
Can I Disable Gatekeeper Permanently?
Yes, using the Terminal command sudo spctl --master-disable. However, this leaves your Mac vulnerable to malware. I recommend only disabling it temporarily for specific apps, then re-enabling it.
Does This Error Mean The App Has A Virus?
Not necessarily. Many legitimate apps trigger this warning. But you should always scan the file with antivirus software before bypassing security. If the source seems sketchy, delete the file.
Will Updating MacOS Fix This Error?
Sometimes. Newer macOS versions update Gatekeeper’s database, which can resolve false positives. But if the developer hasn’t updated the app, the error might persist even after updating.
What If None Of These Solutions Work?
Contact the app’s developer for support. They might provide a signed version or instructions for your specific macOS version. Alternatively, look for an alternative app from the App Store.
Final Thoughts On The Gatekeeper Error
The “can not be opened because the developer can not be verified” message is a protective measure, not a death sentence for your app. Most of the time, the right-click method or adjusting security settings gets the job done. For stubborn cases, Terminal commands offer a reliable workaround.
Always prioritize safety over convenience. Verify the app’s source, scan for malware, and only bypass Gatekeeper for software you trust. With these steps, you can use any app on your Mac without compromising security.
Remember that Apple’s restrictions exist for a reason. The macOS ecosystem is relatively safe because of Gatekeeper. Use the fixes in this guide responsibly, and you’ll enjoy both security and flexibility.