An advanced search utility, HoudahSpot for Mac offers plenty of search filters and features, which enable you to do more thorough searches. It's a capable app but not necessarily easy to use.
Comprehensive search: HoudahSpot for Mac supports multiple search options, such as grouping the searches or using user-defined groups, and can search file attributes and the content of text files. It can also do a fuzzy search using the parameters you enter.
Include and exclude locations: The search can be limited to a certain location on the computer, or it can be specific to certain folders on user-mounted volumes or Spotlight indexed pages. Explicit locations can also be excluded.
Interface full of options: Integrating with Spotlight to help you find files on your computer, it features an interface that looks like Finder, except for the sidebar full of filters and options.
Not for simple searches: Simple searches can be done more easily with Spotlight.
Not for beginners: As an advanced search tool, it might not appeal to beginners. There are too many options that can easily confuse a beginner.
Search parameters can be contradictory: If you're not paying attention to all the search parameters you choose, you might end up with conflicting filters.
HoudahSpot for Mac proves to be a potent search tool that allows you to filter many search results fairly quickly. However, this app can be counterintuitive to basic searches, for which filters are seldom needed. This app is definitely not for beginners -- grab it only if you must search through thousands of files using many filters.
Editors' note: This is a review of the trial version of HoudahSpot for Mac 3.9.2.