How to Install Scarlet iOS on iPhone Without a Computer
Why You Do Not Need a Computer to Install Scarlet iOS
One of the most common misconceptions about third-party iOS app installers is that they require a desktop computer, a USB cable, and some level of technical expertise. Scarlet iOS was built specifically to eliminate those barriers. The entire installation process happens directly on your iPhone or iPad using only a web browser and your iOS Settings app. No Mac, no PC, no Xcode, no AltServer: nothing external at all.
You can do all of it in Safari on your iPhone, starting from our Scarlet iOS install page.
This guide walks you through every step in plain language, including what to do if something does not go as expected.
What You Need Before You Start
Before beginning the installation, make sure you have the following:
- An iPhone or iPad running iOS 14 through iOS 26 (iOS 27 is reported to work too, though not officially confirmed).
- A stable Wi-Fi or cellular data connection.
- Safari browser (recommended; other browsers may not show the system install prompt).
- Approximately 50 MB of free storage on your device.
- A few minutes of uninterrupted time.
You do not need your Apple ID password, a developer account, or any special technical knowledge.
Step-by-Step Installation Instructions
Step 1: Open Safari on Your iPhone
Using Safari is important for this step. The over-the-air install prompt works most reliably in Safari. If you try to use Chrome, Firefox, or another third-party browser, the install may be blocked or may not trigger the correct system prompt.
Open Safari and navigate to the official Scarlet iOS website. Make sure you are on the legitimate, official domain to avoid phishing sites that mimic the real installer.
Step 2: Tap the Install Button
On the Scarlet iOS homepage, locate the primary install button. Tap it. iOS will display a dialog asking whether you want to install Scarlet. Tap Install.
Step 3: Wait for Scarlet to Download
After tapping Install, go to your home screen. The Scarlet iOS icon appears and fills in while it downloads. There is no configuration profile to install in Settings: Scarlet installs as an app.
Be careful with any site that asks you to install a profile for Scarlet: the real install does not need one.
Step 4: Trust the Enterprise Developer Certificate
Installing the app is not the final step. Before Scarlet opens for the first time, you need to trust the developer certificate associated with Scarlet iOS. Here is how:
- Go to Settings → General → VPN & Device Management.
- Under Enterprise App, find the developer listed for Scarlet.
- Tap that developer’s name.
- Tap Trust, then confirm by tapping Trust again in the confirmation popup.
If you skip this step, iOS shows an “Untrusted Enterprise Developer” message when you try to open Scarlet iOS. You normally do this only once. For a deeper explanation of this process, see the guide on how to trust enterprise developer certificates on iPhone.
Step 5: Launch Scarlet iOS
Return to your home screen. You will now see the Scarlet iOS app icon. Tap it to launch the installer. On the very first launch, Scarlet iOS may take a few seconds to initialize its certificate verification and library sync. This is normal.
Step 6: Browse and Install Apps
Once inside Scarlet iOS, you can immediately begin exploring the built-in app library. Tap any app listing to see its description, version history, and install button. Tap Get to install an app. iOS will ask you to confirm the installation: tap Install in that system dialog. The app will appear on your home screen within seconds.
Troubleshooting Common Installation Issues
The Install Prompt Does Not Appear
If tapping the install button does nothing or redirects you to another page, make sure you are using Safari and not a third-party browser. Also check that your internet connection is stable. If the problem persists, try clearing Safari’s cache via Settings → Safari → Clear History and Website Data, then reload the page.
The Install Is Blocked on a Managed Device
This usually happens when a Mobile Device Management (MDM) profile from a school or employer is installed on your device and restricts installing apps from outside the App Store. If your device is managed by an organization, you may need to use a personal device instead.
Apps Show “Unable to Install” After Scarlet iOS Is Running
This is almost always a certificate issue. The enterprise certificate used to sign apps may have been revoked by Apple. Scarlet iOS’s automatic renewal system typically handles this, but during a transition period, you may need to reinstall Scarlet iOS to pick up a freshly signed certificate. Full details are available in the 10 fixes for common Scarlet iOS issues guide.
Scarlet iOS Crashes Immediately on Launch
If the app crashes on launch, the most common cause is a revoked certificate or an iOS version Scarlet does not support yet (it supports iOS 14 to 26). Reinstall Scarlet iOS over the existing copy first. If it still crashes, delete Scarlet, restart your device, and repeat the installation from Step 1; deleting Scarlet does not remove the apps you installed with it.
Keeping Scarlet iOS Updated
Scarlet iOS checks for its own updates automatically in the background. When a new version is available, you will see a notification badge on the app icon. Tap the app, navigate to Settings within Scarlet iOS, and tap Check for Updates. The update installs over the air, with no computer needed, just like the original installation.
To learn more about the update process in detail, read how to update Scarlet iOS to the latest version.
Ready to Install?
Scarlet iOS installation happens in Safari on the device and gives you access to apps Apple does not carry. The process above works on every supported iPhone and iPad model running iOS 14 through iOS 26 (iOS 27 is reported to work as well, though not officially confirmed), including current iPhone models.
Head to Scarlet iOS now, tap the install button in Safari, and start exploring a world of apps beyond the App Store.