The tool is showing a lot of valid links with a status:
(TypeError: NetworkError when attempting to fetch resource.)
Not sure if this is due to a too short timeout or maybe some other status codes (like redirects)... but is making using the tool time consuming, as I still need to manually validate it's assessments (OK it's still better than going through all of my links manually).

There shall be an option to filter the list based on the status code (many 401s (Require Authentication) are valid links, so shall be a way to exclude them from the list).

Also, I have quite a few bookmarklets - the address actually containing javascript (starts with javascript:) - they shall be omitted from the list.
Keep up to great work, thanks a lot for your efforts to make our life easier ;-)