Lucidworks Fusion
by Lucidworks
Lucidworks Fusion is an enterprise search and discovery platform built on Apache Solr. It provides tools for indexing, querying, relevance tuning, personalization, analytics, and machine-learning-assisted search applications.
Why Abandoned
Lucidworks continues to publish Fusion product documentation and maintains a product page for the platform. Fusion 5 documentation includes recent release notes, supporting an active status.
💵 Pricing & access
- Pricing model
- Not documented
- Starting at
- Not documented
- Official site
- Visit Lucidworks Fusion →
🩺 Health Signals
- HTTP Status
- 403
- Response
- —
- SSL
- —
- Confidence
- 93%
- Domain expires
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- Last content change
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- Last tweet
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- API status
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📅 Timeline
Lucidworks Fusion launched
Lucidworks announced Fusion, a search development platform designed to make enterprise data easier to index, analyze, and search.
$50 million Series D announced
Lucidworks announced a $50 million Series D financing round led by Top Tier Capital Partners, with participation from existing investors.
Fusion 4 introduced
Lucidworks announced Fusion 4 with expanded machine-learning capabilities, including signals-based personalization and tools for building AI-powered search applications.
$100 million investment announced
Lucidworks announced a $100 million investment led by Francisco Partners and TPG Sixth Street Partners to support product development and growth.
🔄 Alternatives to Lucidworks Fusion
Cohere
🟢ActiveEnterprise AI platform providing NLP models for text generation, classification, and search.
Hugging Face
🟢ActiveThe GitHub of machine learning — hosting models, datasets, and AI applications.
Perplexity AI
🟢ActiveAI-powered answer engine that provides cited, real-time answers to complex questions.
You.com
🟢ActiveAI search engine offering summarized answers with source citations and app integrations.
🪦 Other dead Search tools
Waldo
🟡Acquired / MergedWaldo was a research search platform for finding and extracting information from online sources. It provided source-backed answers and tools for organizing research, with a focus on professional knowledge work.
Scite
🟡Acquired / MergedScite is a research discovery and citation-analysis platform that uses machine learning to classify citation contexts as supporting, contrasting, or mentioning a claim. It also offers literature search and an AI research assistant.
Neeva
🔴Shutdown / DeadAd-free, AI-powered search engine founded by ex-Google exec that aimed to provide unbiased search results.
Casetext
🟡Acquired / MergedCasetext launched CoCounsel in March 2023, a GPT-4-powered legal assistant for case analysis, contract review, and deposition prep. The product gained traction with AmLaw 100 firms and Thomson Reuters announced a $650M cash acquisition in June 2023, closing in August. CoCounsel was rebranded as a Thomson Reuters product line and integrated with Westlaw. The standalone Casetext site is gone.
❓ Frequently Asked Questions
What is Lucidworks Fusion?
Lucidworks Fusion is an enterprise search and discovery platform for building applications that index organizational data, retrieve relevant results, personalize experiences, and analyze search behavior.
Is Lucidworks Fusion still active?
Yes. Lucidworks maintains the Fusion product page and current Fusion documentation, including release notes. The platform appears active as of September 2026.
Is Lucidworks Fusion based on Apache Solr?
Yes. Fusion is built around Apache Solr and adds ingestion pipelines, query processing, security, analytics, relevance tooling, and machine-learning features for enterprise deployments.
What is Lucidworks Fusion used for?
Organizations use Fusion for website search, e-commerce product discovery, workplace search, customer-service knowledge retrieval, and other applications that require relevance tuning and personalization.
Is Lucidworks Fusion open source?
Fusion is a commercial Lucidworks product. It uses Apache Solr, an open-source search platform, but Fusion's added management, application, analytics, and machine-learning capabilities are commercially licensed.