Frequent traveler Tzahi Zilbershtein has set up a site, which predicts how crowded Ben Gurion airport is likely to be. The site (in Hebrew) assesses the arrivals hall, check-in, and security checks in both Terminal 1 & 3. It has five ratings: deserted, light, medium, heavy, and peak.

https://en.globes.co.il/en/article-new-app-predicts-pre-flight-crowding-at-ben-gurion-airport-1001419175

https://tlv-busy.web.app/