Deals in the Australian technology start-up sector fell to their lowest level in 18 months in the June quarter, as megadeals dried up and funding for female founders reached record lows.

The latest figures from Cut Through Venture, which tracks venture capital investments, showed Australian start-ups raised $812 million across 76 deals in the three months to June 30, an 18 per cent drop on the first quarter, and a 47 per cent decline on the same period last year.