Hello! I understand you're having trouble connecting your Cololight device to the app on your iPhone running iOS 18.5. I'd like to help you get it working. To get started, could you tell me if the app opens properly and just fails at connecting to the device, or does it not open or respond at all? Also, do you see any specific error messages when trying to connect?

In the meantime, here’s a simple step-by-step to troubleshoot the connection issue:

1. Check Power and Proximity
Make sure your Cololight device is properly plugged in and powered on. Also, keep your iPhone close to the Cololight for the initial connection, as proximity helps the device discover the light.

2. Wi-Fi Network
Cololight devices usually require connection to a 2.4GHz Wi-Fi network, not 5GHz. Ensure your iPhone is connected to the correct Wi-Fi band, and your Cololight is within good range of the router.

3. Restart Devices
Try restarting your Wi-Fi router, your iPhone, and power cycling the Cololight (turn it off and on).

4. Reset Cololight
If nothing else works, perform a reset on the Cololight. Usually, this involves pressing and holding the reset button (or reset hole) on the device until the indicator light flashes, then letting go and waiting for it to reboot.

5. App Permissions and Bluetooth
Make sure the Cololight app has all the necessary permissions enabled on your iPhone, such as local network access and Bluetooth if required. You can check this in Settings > Cololight app.

6. Update App and iOS
Ensure both your Cololight app and iOS 18.5 are up to date.

If you could try these and let me know what happens or if you see any errors, I can help you further from there!

Are you able to try these and update me?