We build powerful

Search solutions

Our Elasticsearch and Solr experts provide professional consulting and tailored application development.

Search services»

We wrote the book on

Search relevance

What good is search if you can never find anything? We're pioneers in smarter search that "gets" users.

Learn about relevance »

We are passionate

Industry leaders

We've spoken at conferences from San Diego, to NYC, to Dublin. Our blog is read by industry experts.

Blog  |  Events  |  Podcast

We're the relevance experts

Good search understands a user's intent, not just what they type.

We wrote Relevant Search, the definitive guide to building smarter Elasticsearch and Solr applications.

One of the best and most engaging technical books I've ever read. — Trey Grainger, Lucidworks
Will help you solve real-world search relevance problems for Lucene-based search engines — Dimitrios Kouizes-Loukas, Bloomberg

Read the book »
Get help from the experts »

Products and services for smarter search

We built Quepid, a search testing platform that takes the guesswork out of search relevancy.

Do NOT attempt a search project without it. — John Bickerstaff

Try it Now »

Want to just understand why results are showing up in your search?

Use splainer for free »

Selected Clients

  • Cisco
  • Career Builder
  • O'Reilly


  • Elastic
  • Datastax

Our publications

Relevant Search »
Learn the secrets of building intuitive, targeted search.

Elasticsearch course »
Dive into Elasticsearch and AngularJS in this video course.

Solr Enterprise Server »
We cowrote the first book on Solr. Now in its third edition.

The blog and other happenings

Vespa vs Lucene: First Impressions Matt overstreet on October 6, 2017

Our first impressions of Vespa compared to Solr or Elasticsearch

Elasticsearch Learning to Rank 1.0 RC1 Released Doug turnbull on October 2, 2017

We've released Elasticsearch Learning to Rank 1.0 RC1, which brings machine learning capabilities to Elasticsearch relevance ranking. Beginning the March to fully releasing version 1.0.

Solving The Search Management Minefield in Open Source Search Doug turnbull on August 7, 2017

Don't be fooled by fancy technology: search is fundamentally a business problem; not a technical one. Technologists and domain experts need to establish careful contracts for managing search together.

Come see E at Machinary.ai - Getting started with Learning To Rank Nov 7th, 2017 | Tysons Corner, VA

Overview, prerequisites, and implementation details of getting started with Learning To Rank. Why relevancy tuning will be taken over by machine learning, but not yet.

Talk directly with Eric Pugh, our founder & CEO
(434) 466-1467 | eric@o19s.com