
Online usage of the site cost around the same at $10/month. The users of other OS have to pay a maintenance fee annually of $69. The downloadable software is around $297, one time payment for windows users. It has a online and offline version of the software. It is a generic CAD tool for flowcharts, floorplan, smart art etc. Smartdraw is very similar to Lucid chart. Lucidchart is a generic design tool and can be used for creating a wide range of drawings - from flowcharts and organizational charts to piping drawings. So you only need a Lucidchart account and an internet connection to use this design tool. It is offered on Software as a Service (SaaS) basis.

Lucidchart is a lightweight online CAD software. While some other CAD tools are dedicated to P&IDs. Some of them are generic CAD tools, used for creating many different kinds of engineering drawings. There are a number of CAD software tools that can be used for creating a P&ID.

A P&ID is normally developed from a Process Flow Diagram (PFD) which captures the basic process flow, at the design stage of a plant. P&IDs of a plant are developed by process design engineers and are followed by instrumentation and piping engineers. P&ID is later used for assistance for construction of the corresponding plant and for operating that plant. Piping and Instrumentation Diagram (P&ID) is a drawing elaborating the details of piping and instrumentation of a processing plant, developed at the design stage. Piping & Instrumentation Diagrams or P&IDs are very commonly used technical drawings in the process industry - for example, oil & gas, petrochemical, pharmaceutical and chemical manufacturing industries.
