MkDocs vs Solr: What are the differences?

What is MkDocs? *A static site generator *. It builds completely static HTML sites that you can host on GitHub pages, Amazon S3, or anywhere else you choose. There's a stack of good looking themes available. The built-in dev-server allows you to preview your documentation as you're writing it. It will even auto-reload and refresh your browser whenever you save your changes.

What is Solr? An open source enterprise search server based on Lucene search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication etc. Solr is the popular, blazing fast open source enterprise search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, near real-time indexing, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly reliable, scalable and fault tolerant, providing distributed indexing, replication and load-balanced querying, automated failover and recovery, centralized configuration and more. Solr powers the search and navigation features of many of the world's largest internet sites.

MkDocs belongs to "Static Site Generators" category of the tech stack, while Solr can be primarily classified under "Search Engines".

Slack, Coursera, and Zalando are some of the popular companies that use Solr, whereas MkDocs is used by Hactar, elmah.io, and Worldsensing - Mobility. Solr has a broader approval, being mentioned in 173 company stacks & 254 developers stacks; compared to MkDocs, which is listed in 5 company stacks and 8 developer stacks.