OpenTrace is a brand new environmental infrastructure that aggregates product materials' information from bottom up and dynamically calculates the environmental load to indicate them. Existing indicators are well-authenticated, but are very complex and static when calculating the environmental load, so it costs us so much money and time. OpenTrace approaches to this difficult problem from a totally different aspect which is simple and free for use. Based on simple and flexible calculation method, it provides many environmental tools to meet users' needs including; [Calculation] convenient web-interface for producer [Labels] printable environmental labels to indicate CO2 emission, usage of fishery-resources, and distances such as food miles [Search] various product search for consumers by keyword, product code and location [Web API] provide interface that external service can use for their service [License] provide GPL-like license to propagate its philosophy