Apache Solr VS Glean

Compare Apache Solr VS Glean and see what are their differences

Rating: 0 reviews
Pricing: Open source

Alternatives Is it good?

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Rating: 0 reviews
Pricing: Paid

Alternatives Is it good?

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Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, Apache Solr seems to be more popular. It has been mentioned 19 times since March 2021.

social mentions: 19 vs 0
Custom Search Engine popularity: 100% vs 0%
alternatives listed: 132 vs 83

Base details

Website, pricing, platforms and company facts side by side.

	Apache Solr	Glean
Website	solr.apache.org	glean.com
Pricing	Open source	Paid
Company	—	Startup from the United States · 500 - 999 employees
Listed in	Custom Search Engine Custom Search Search API Search Engine +1	AI Tools AI Assistant AI Search Enterprise Search AI Work AI AI Agents +4

About Apache Solr and Glean

In their own words, as submitted to SaaSHub.

Apache Solr

Glean

No description of Apache Solr yet.

Glean is the Work AI platform that connects and understands all your enterprise data, to generate trusted answers and automate work grounded in company knowledge. Using Glean’s powerful search and RAG technology to retrieve the most relevant, up-to-date information, Glean's AI assistant generates...

Features and specs

What each product offers, as listed by its team.

Apache Solr 6 features

Glean 0 features

Scalability
Apache Solr is highly scalable, capable of handling large amounts of data and numerous queries per second. It supports distributed search and indexing, which allows for horizontal scaling by adding more nodes.
Flexibility
Solr provides flexible schema management, allowing for dynamic field definitions and easy handling of various data types. It supports a variety of search query types and can be customized to meet specific search requirements.
Rich Feature Set
Solr comes with a wealth of features out-of-the-box, including faceted search, result highlighting, multi-index search, and advanced filtering capabilities. It also offers robust analytics and joins support.
Community and Documentation
Being an open-source project, Apache Solr has a strong community and comprehensive documentation, which ensures continuous improvements, updates, and extensive support resources for developers.
Integrations
Solr integrates well with a variety of databases and data sources, and it provides REST-like APIs for ease of integration with other applications. It also has strong support for popular programming languages like Java, Python, and Ruby.
Performance
Solr is built on top of Apache Lucene, which provides high performance for searching and indexing. It is optimized for speed and can handle rapid data ingestion and real-time indexing.

Possible disadvantages

Complexity
The initial setup and configuration of Apache Solr can be complex, particularly for those not already familiar with search engines and indexing concepts. Managing a distributed Solr installation also requires considerable expertise.
Resource Intensive
Running Solr, especially for large datasets, can be resource-intensive in terms of both memory and CPU. It requires careful tuning and adequate hardware to maintain performance.
Learning Curve
The learning curve for Apache Solr can be steep due to its extensive feature set and the complexity of its configuration options. New users may find it challenging to get up to speed quickly.
Consistency Issues
In distributed setups, ensuring data consistency can be challenging, particularly for users unfamiliar with managing clustered environments. There may be delays or issues with synchronizing indexes across multiple nodes.
Maintenance
Ongoing maintenance of a Solr instance, including monitoring, tuning, and scaling, can be labor-intensive. This requires dedicated effort to keep the system running efficiently over time.
Limited Real-time Capabilities
Although Solr provides near real-time indexing, it may not be as effective as some specialized real-time search engines. For applications requiring truly real-time capabilities, additional solutions might be necessary.

No features have been listed yet.

Analysis

An editorial look at what each product does well and who it suits.

Apache Solr

Glean

Overall verdict

Yes, Apache Solr is generally considered a good option for organizations seeking a reliable, scalable, and flexible search platform. It offers extensive features and is supported by a strong community, making it a solid choice for many use cases.

Why this product is good

Apache Solr is highly regarded for its robust full-text search capabilities, scalability, and ease of integration. As an open-source search platform, it is built on Apache Lucene and provides powerful distributed search and indexing, replication, load-balanced querying, and automated failover and recovery. Solr is designed to handle large volumes of data efficiently and supports various data formats with powerful data management features.

Recommended for

Apache Solr is recommended for organizations that need to implement powerful search capabilities, especially those managing large, complex datasets. It is ideal for businesses that require full-text search features, e-commerce sites, content management systems, and big data applications that demand high query performance and scalability.

Overall verdict

Glean is a strong enterprise AI search and knowledge management platform that unifies company data across apps, delivering fast, secure, and permission-aware answers powered by advanced language models.

Why this product is good

Connects and searches across dozens of enterprise apps like Google Workspace, Slack, Jira, Confluence, and Salesforce from a single interface
Respects existing document permissions so users only see content they're authorized to access
Uses AI and large language models to provide conversational answers, summaries, and generative assistance grounded in company knowledge
Learns organizational context, people, and terminology to deliver more relevant and personalized results
Offers a platform for building custom AI agents and workflows tailored to business needs
Strong focus on enterprise-grade security, compliance, and data governance

Recommended for

Mid-to-large enterprises with data scattered across many SaaS applications
Knowledge workers who spend significant time searching for information internally
IT and engineering teams needing quick access to documentation and code knowledge
Customer support and sales teams requiring fast retrieval of internal resources
Organizations looking to deploy AI assistants and agents grounded in their own data
Companies prioritizing secure, permission-aware AI search over public LLM tools

Videos

Walkthroughs and reviews on video.

Apache Solr 2 videos + Add

Glean 3 videos + Add

Solr Index - Learn about Inverted Indexes and Apache Solr Indexing

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100

Apache Solr

Glean

100% 100%

Custom Search Engine

0% 0%

AI Assistant

100% 100%

Custom Search

0% 0%

100% 100%

User comments

Share your experience with using Apache Solr and Glean. For example, how are they different and which one is better?

Reviews and articles

External articles and on-site reviews we used to compare the two products.

Apache Solr no reviews yet

Glean no reviews yet

Top 10 Site Search Software Tools & Plugins for 2022
influencermarketinghub.com · Mar 2022

Apache Solr is optimized to handle high-volume traffic and is easy to scale up or down depending on your changing needs. The near real-time indexing capabilities ensure that your content remains fresh and search...
5 Open-Source Search Engines For your Website
vishnuch.tech · Jul 2021

Apache Solr is the popular, blazing-fast, open-source enterprise search platform built on Apache Lucene. Solr is a standalone search server with a REST-like API. You can put documents in it (called "indexing") via...
Elasticsearch vs. Solr vs. Sphinx: Best Open Source Search Platform Comparison
greenice.net · Feb 2018

Solr is not as quick as Elasticsearch and works best for static data (that does not require frequent changing). The reason is due to caches. In Solr, the caches are global, which means that, when even the slightest...

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Apache Solr 19 mentions

Glean 0 mentions

List of 45 databases in the world
Solr — Open-source search platform built on Apache Lucene. - Source: dev.to / about 2 years ago
Considerations for Unicode and Searching
I want to spend the brunt of this article talking about how to do this in Postgres, partly because it's a little more difficult there. But let me start in Apache Solr, which is where I first worked on these issues. - Source: dev.to / over 2 years ago
Swirl: An open-source search engine with LLMs and ChatGPT to provide all the answers you need 🌌
Using the Galaxy UI, knowledge workers can systematically review the best results from all configured services including Apache Solr, ChatGPT, Elastic, OpenSearch, PostgreSQL, Google BigQuery, plus generic HTTP/GET/POST with... - Source: dev.to / about 3 years ago

Tracking Glean since Mar 2024.

Alternatives to Apache Solr and Glean

When comparing Apache Solr and Glean, you can also consider the following products.

ElasticSearch
Elasticsearch is an open source, distributed, RESTful search engine.

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Microsoft Copilot
Microsoft Copilot leverages the power of AI to boost productivity, unlock creativity, and helps you understand information better with a simple chat experience.

Compare Microsoft Copilot to Apache Solr or Glean:

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Algolia
Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.

Compare Algolia to Apache Solr or Glean:

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ActionSync.ai
Action Sync connects your tools, understands your business context, and executes actions securely. One AI layer for search, insights, and execution, all with full data control.

Compare ActionSync.ai to Apache Solr or Glean:

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Swiftype
The simplest way to add search to your website or application. Sign up for free.

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GetGuru
Get started for free with Guru, the powerful company wiki that cuts through chat noise to serve you the info you actually need to do your job.

Compare GetGuru to Apache Solr or Glean:

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