Providing online non-downloadable computer software for marketing purposes, namely, non-downloadable computer software to track and measure application downloads, installations and use to determine and analyze efficacy of marketing campaigns; providing online non-downloadable web based computer software to determine marketing attribution for application installations, launches or other in-app conversion events; providing online non-downloadable web based computer software for monitoring the success and progress of marketing campaigns; providing online non-downloadable web based computer software to detect and protect against fraud related to marketing campaigns