Until 2007, the number of attendees varied between 2,000 and 4,200; however, during WWDC 2007, Steve Jobs noted that there were more than 5,000 attendees.
Jumlah peserta biasanya bervariasi antara 2.000 dan 4.200 pengembang; namun, pada WWDC 2007, Steve Jobs mencatat bahwa jumlahnya mencapai lebih dari 5.000 orang.