Built using
Ruby on Rails, LiquidPlanner is the industry’s only priority-based, predictive online project management solution and claims to be the first
software as a service (SaaS) based project management solution to allow users to express uncertainty in their task estimates using ranges. The application employs a probabilistic scheduling engine that is claimed to build more accurate schedules. Several authors have noted that estimating in ranges (e.g. 3–4 days, 1–3 hours) is preferable to single-point estimates (e.g. 1 hour, 2 days).
Steve McConnell states "simplistic single-point estimates are meaningless because they don't include any indication of the probability associated with the single-point." From these uncertainty measures over time it can plot the history of the project estimates. This type of plot is often referred to as the
Cone of Uncertainty. Project managers create workspaces and invite users to participate in a way similar to
LinkedIn or
Facebook. The workspace can contain multiple projects and keeps a running narrative of tasks, comments, documents, and other project collateral. In September 2011, LiquidPlanner introduced their free mobile app that connects the LiquidPlanner online project management workspace to the Apple
iPhone and
iPad. This app is no longer available in Apple play store as of 2024. The LiquidPlanner
application programming interface (API) enables project managers to programmatically interact with their LiquidPlanner workspace. With the API, most of the LiquidPlanner project management actions can be automated. For example, you can create a task and then post comments, track time against it, and mark the task done when completed. LiquidPlanner was founded in 2006. released its first public beta in 2008. ==Funding==