No jailbreak detection

I’m trying to make an app which onely works on jailbroken iDevices. I allready made a jailbreak detection:

([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"cydia://"]]);{
    UIAlertView *cydiaisinstalled=[[UIAlertView alloc]initWithTitle:@"Cydia is installed!"
                                                            message:@"You can use Respring!"
    [cydiaisinstalled show];

But now I need the reverse thing. I need a NON JAILBREAK detection.

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    3 Solutions Collect From Internet About “No jailbreak detection”

    Try accessing any file outside the app’s sandbox. For example:

    BOOL IsDeviceJailbroken(void) {
        return NO;
        return [[NSFileManager defaultManager] fileExistsAtPath: @"/bin/bash"];

    Note that having Cydia installed and having a jailbroken device are two different things.

    I wrote a function that detects whether the device is jailbroken for another question, but it seems relevant here:

    - (BOOL) isJailbroken() {
        //If the app is running on the simulator
            return NO;
        //If its running on an actual device
            BOOL isJailbroken = NO;
            //This line checks for the existence of Cydia
            BOOL cydiaInstalled = [[NSFileManager defaultManager] fileExistsAtPath:@"/Applications/"];
            FILE *f = fopen("/bin/bash", "r");
            if (!(errno == ENOENT) || cydiaInstalled) {
                //Device is jailbroken
                isJailbroken = YES;
            return isJailbroken;

    This function uses two checks to see if the phone is jailbroken: it first checks if Cydia is installed. Not all jailbroken devices have Cydia installed, though most do, so I also check for the existence of bash, which also only appears on jailbroken devices. Note that this function will work in nearly all cases, but it’s probably not 100%. The only people that don’t have Cydia on their jailbroken iDevice are probably those that are experimenting with jailbroken devices and not using them for advantages like tweaks and themes.

    OK thanks for all the answers but I found it out on my own. Here is the code:

    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"cydia://"]]) {
        //insert action if cydia is installed
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"cydia://"]] == NO) {
        //insert action if Cydia is not installed

    With this code you can detect any application on your idevice as long as the app has an URL scheme you can find most of the URL scheme here:

    PS: You have to replace the green part whith your actions:)