When you open AirDroid on your Android device you'll notice there are two web addresses: http://web.airdroid.com and an IP address like http://192.168.xx.xx:8888. If your Android device and computer are on the same WiFi network, you'll be able to visit the IP address above on your computer. And you'll enter Lite mode.
Lite mode allows you to connect your Android devices directly, without passing through the AirDroid web servers. It may not have all the AirDroid features.
How to sign in with IP address?
Open AirDroid on your Android device, and you should see something like the screenshot below:
Visit the IP address (http://192.168.199.89:8890, your exact address may vary) via your web browser on your computer:
And your Android device will instantly get a connection request as below:
Tap Accept, and you'll sign in to AirDroid using Lite mode.