Apache Solr vs Notion

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.

Notion is a cloud workspace for organising personal projects and coordinating work. Its pages, blocks, and databases support note sharing and real-time collaboration, and offline access is available. It runs on the web, Windows, macOS, iOS, and Android, with a Chrome extension also listed. Connections include Slack, Google Drive, Figma, GitHub, Zoom, and Microsoft Teams. Notion supports semantic search, AI search or answers, and version history. The Free plan costs $0 per member per month and includes trial AI capabilities and a trial of Notion AI. Free uploads are limited to 5 MB per file, multi-member Free workspaces have a limited number of blocks, and external guests are limited to 10. Plus costs $10 per member per month, and Business costs $20 per member per month; yearly payment saves up to 20%. Paid plans list unlimited guests. Notion says data is encrypted and private, and that Notion AI does not use customer data to train models unless users opt in. Enterprise workspaces get zero data retention with LLM providers.