Apache Solr vs Guru

Apache Solr is a free, open-source, self-hosted search platform built on Apache Lucene. It provides full-text, vector, geospatial, and hybrid search through a REST query interface. Documents can be sent over HTTP as JSON, XML, CSV, or binary, with results returned in those formats. Matching supports phrases, wildcards, joins, and grouping; discovery tools include faceting, autocomplete, spelling suggestions, hit highlighting, and result clustering. Solr distributes indexing, replicates data, balances queries, and supports automated failover and recovery. Apache Tika integration extracts rich content such as PDF and Microsoft Word files. Its administrative interface controls instances and exposes cluster state, logs, threads, and metrics. Listed security capabilities include SSL, authentication, and role-based authorization. Solr runs on Linux, macOS, and Windows, with API access, and is licensed under Apache License, Version 2.0. The project describes use from weekend projects to global enterprises. Releases are not scheduled in advance, and versions below 9.10 are end of life without further updates. The Apache Solr plan is free.

Guru is a paid knowledge platform for publishing trusted answers inside an organization. It combines a unified retrieval index and hybrid search across connected sources with Knowledge Agents that answer questions using governed content, citations, and permission-aware access. Guru connects to more than 100 enterprise tools, including Slack, Microsoft Teams, Salesforce, Zendesk, Confluence, and SharePoint. Automated verification uses usage signals, content age, and policy rules; Guru says this handles approximately 80–90% of verification. MCP support lets compatible AI tools and agents access the governed knowledge layer. A browser extension for Chrome, Microsoft Edge, and Opera surfaces answers in the workflow. Mobile apps support searching, viewing, sharing, and copying Cards, with listed requirements of iOS 12.1 or later and Android 10. Connected-source permissions carry across surfaces, alongside role-based access controls and single sign-on. Guru lists SOC 2 Type II auditing, GDPR support, Microsoft 365 and Google CASA certifications, and optional HIPAA agreements. Pricing is custom and available on request.