Comparagraph lets you quickly compare two plots--line graphs, scatter graphs, any type of image you'd like to overlay onto another with about a dozen clicks. JPG, JPEG, PNG & GIF are currently supported.
Please email me (Jim) at email@example.com with comments, problems, suggestions, etc.
The number of housing starts and Lowes' stock price have different time ranges. The different y-axes units is not a problem since we just want to compare trends.