Company lists · Data refreshed September 2026
Top 25 Search indexing optimization platforms worldwide
RevenueBase identified 980 search indexing optimization platforms worldwide as of September 2026 and tracks 12,148 professional contacts across them, including 2,606 with verified work emails. The United States is the largest market and London the largest hub.
This list covers search indexing optimization platforms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 2026. Country and city lists for search indexing optimization platforms follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest search indexing optimization platforms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 811 contacts → | ||||
Strong evidence “Algolia is a leading AI search and discovery platform, powering more than 1.75 trillion queries each year for over businesses worldwide.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 671 contacts → | ||||
Strong evidence “Constructor is the only search and discovery platform designed exclusively for commerce where conversions matter.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 589 contacts → | ||||
Partial evidence “At Conductor, we’re on a mission to help companies realize the full potential of their AI search presence and translate their wisdom into content that helps people.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 253 contacts → | ||||
Partial evidence “Botify’s AI search solutions give brands the power to be found everywhere, by consumers, bots, and agents alike.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 205 contacts → | ||||
Partial evidence “Lucidworks makes search a superpower-ensuring the right information reaches the right people at the right time.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 174 contacts → | ||||
Strong evidence “Ahrefs is the marketing platform built to keep your brand discoverable across search, AI, and the web.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 166 contacts → | ||||
Strong evidence “Even before AI-powered Search and platforms like ChatGPT or Perplexity started reshaping how people search, we anticipated the shift in user behaviour.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 146 contacts → | ||||
Partial evidence “Luigi’s Box is a set of tools for e-commerce (search analytics, site search & product discovery), that helps you to increase your sales and conversions by providing your visitors…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 123 contacts → | ||||
Strong evidence “Adthena is the market-leading, AI-driven search intelligence platform that helps enterprise brands and agencies lower paid search costs, protect brand equity and stay ahead of…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 122 contacts → | ||||
Indirect evidence “We are SEO professionals, content writers, and marketers, just like you.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 110 contacts → | ||||
Partial evidence “SearchStax - the Search Experience Company - enables marketers and developers to deliver fast, relevant website search experiences.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 91 contacts → | ||||
Partial evidence “Writesonic runs your marketing for the AI-search era.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 79 contacts → | ||||
Strong evidence “Serpstat is the go-to platform to speed up search marketing goals achievement.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 72 contacts → | ||||
Strong evidence “Surfer is the most complete platform for AI Search Optimization and visibility.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 69 contacts → | ||||
Strong evidence “seoClarity is an enterprise search intelligence platform that merges SEO and AI search optimization to keep global brands visible across a fragmented search landscape.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 62 contacts → | ||||
Partial evidence “performance.io are the specialist SEO and AI search agency helping brands drive online performance in the evolving search landscape.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 59 contacts → | ||||
Partial evidence “Your AI-powered SEO Co-Pilot Summary: Scalenut is an AI-powered SEO platform that helps businesses drive organic traffic and build sustainable businesses.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 58 contacts → | ||||
Indirect evidence “Every day, companies and government agencies generate huge amounts of data, distributed across emails, file storage systems, specialist applications, cloud services, and databases.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 55 contacts → | ||||
Partial evidence “WEBCEO LLC, founded in produces the world-famous WebCEO SEO Platform with 24 tools and white-label functionality.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 49 contacts → | ||||
Indirect evidence “Chroma builds data infrastructure for AI” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 48 contacts → | ||||
Partial evidence “site:https://Gloc.al (in process of re-branding) Glocal SEO Platform 2025 raised USD plus USD startup valued currently on USD $8.5 million by retail investors of…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 46 contacts → | ||||
Indirect evidence “Autonomy is a technology company on a mission to make access to mobility easy and affordable through car subscriptions.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 46 contacts → | ||||
Indirect evidence “X1 creates exceptional solutions for people and organizations that need to find information, whether on individual desktops or company networks at the fastest speeds in the…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 45 contacts → | ||||
Indirect evidence “SmartKeyword est la solution de référencement naturel la plus complète du marché.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 40 contacts → | ||||
Indirect evidence “Le SEO évolue, notre métier aussi.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: search indexing optimization platforms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names search indexing optimization platforms.
- Partial evidence
- Its own public description names part of search indexing optimization platforms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name search indexing optimization platforms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 980 search indexing optimization platforms worldwide
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Search indexing optimization platforms worldwide at a glance
As of Sep 29, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among search indexing optimization platforms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for search indexing optimization platforms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “search indexing optimization platforms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names search indexing optimization platforms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among search indexing optimization platforms, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 2,606 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 29, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Search indexing optimization platforms by location
4 lists · largest firstEvery Search indexing optimization platforms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Search indexing optimization platforms based in the United States252
- Search indexing optimization platforms based in the United Kingdom56
- Search indexing optimization platforms based in Germany31
Cities
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names search indexing optimization platforms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many search indexing optimization platforms are there worldwide?
RevenueBase identified 980 search indexing optimization platforms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Algolia, headquartered in Palo Alto, tops this list with the largest team on record.
Which country has the most search indexing optimization platforms?
The United States leads with 252 companies, followed by the United Kingdom (56) and Germany (31). Every search indexing optimization platforms list by country and city is linked on this page.
Which city has the most search indexing optimization platforms?
London leads with 28 headquartered companies, followed by San Francisco (25) and New York (18).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,606 verified decision-maker contacts tracked across these 980 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.