Yes, the app is free—no subscription, no hidden fees. You pay the exact same drop-off fee (£5 for 10 minutes, £6 for 15 minutes, etc.) as you would at the machine. The app takes a tiny processing fee? Nope. Zero. Check the official Gatwick site if you don’t believe me.
I triple-checked my bank statement after first use. It was lean, clean, and exact. I almost felt guilty for not suffering. Almost.
Drop off and pick up at Gatwick Airport