When you search the web, the answer comes from an index: a huge database that records which pages exist and what they contain. Building one is difficult and expensive, so most search engines rely on a small number of indexes. A search service that decides to stop borrowing and use its own index is making a major technical and financial commitment. Understanding what goes into it explains why such moves are rare and why they matter.
What an index is
Think of the index at the back of a book. It lists terms and where they appear. A web index does the same for billions of pages. It records words, links, page titles, languages, freshness and many other signals, then stores them in a way that lets software find relevant pages in milliseconds.
The stages of building one
1. Crawling. Automated programs called crawlers visit pages, follow links and download content. They must respect rules in robots.txt files and avoid overloading sites.
2. Parsing. The system extracts text, images, metadata and structure from each page.
3. Deduplication. Many pages are copies or near-copies, and the index must recognise them.
4. Filtering. Spam, malware pages and low-quality content are detected and demoted or removed.
5. Indexing. Information is organised into data structures that support fast lookup.
6. Ranking. Algorithms score pages for each query using signals like relevance, authority, freshness and user experience.
7. Serving. Servers answer queries with results in a fraction of a second.
8. Refreshing. Crawlers revisit pages to catch updates, with popular and fast-changing pages checked more often.
Each step requires engineering skill and substantial computing resources.
Why it costs so much
- Scale. The web contains vast numbers of pages, and it keeps growing.
- Storage and processing. Keeping copies and analysing them takes thousands of machines.
- Bandwidth. Crawling consumes large amounts of data transfer.
- Constant change. Pages are edited, moved or deleted every second.
- Quality control. Spammers continually try to game rankings.
- Language coverage. Supporting many languages and regions multiplies the work.
For this reason, newer search services often start by licensing results from existing indexes, then build their own gradually, often beginning with the most popular parts of the web.
Why independence matters
An engine that depends on another company’s index has limited control.
- Policy changes. The index provider can change terms, pricing or access.
- Ranking decisions. The borrower inherits the lender’s choices about quality and bias.
- Privacy limits. Some privacy features are easier to guarantee when the same company runs the index.
- Innovation. Different indexes allow new approaches to ranking, such as favouring independent sites or reducing spam in different ways.
- Resilience. More indexes mean less reliance on a few points of failure.
The web search market is highly concentrated, so any serious independent index adds diversity.
How they compete
An independent index cannot beat the largest ones on size, at least at first. Instead, projects focus on strengths.
- Transparency: explaining how rankings work.
- Privacy: avoiding user profiling.
- Community input: allowing users to adjust or vote on results.
- Specialisation: concentrating on certain languages, topics or types of content.
- Alternative signals: using human curation or open datasets.
- Customisation: letting users change source rankings or block sites.
How to judge a search engine’s quality
Try a test of your own.
1. Make a list of ten queries you often use, mixing common and obscure topics.
2. Run them on two or three engines.
3. Note how often you find what you need in the first page.
4. Check freshness with a recent event or product.
5. Compare how many results are spam or heavily advertised.
6. Look at whether local searches are accurate.
Different engines suit different needs. You may prefer one for everyday queries and another for rare ones.
Open indexes
Some groups publish web crawls as open datasets, which anyone can use to build search or train models. These shared resources lower the barrier for new projects, though they require large processing capacity to use. Governments and researchers have discussed public web indexes as a way to encourage competition and innovation.
Effects on publishers
Websites rely on search traffic, and a new index means another crawler visiting their pages. Publishers can manage this through robots.txt, sitemaps and webmaster tools. Having multiple indexes can reduce dependence on a single source of traffic, but it also means more crawlers consuming server resources. It is a good idea to check which crawlers visit your site and to block those you do not want.
What you can do as a user
- Try an independent engine for a week and compare.
- Use its settings to tune results.
- Report spam pages.
- Support services that are transparent about their data.
- Keep bookmarks of key sites so you are not fully reliant on search.
The bottom line
Search appears simple, but it sits on top of enormous infrastructure. An engine that builds its own index takes on cost and risk in exchange for independence. If it succeeds, users gain choice, publishers gain alternatives, and the web gets a bit less dependent on a handful of gatekeepers. Whether it works depends on quality, funding and patience.
For wider background, Wikipedia has a general overview of Brave Search. You may also find these related guides useful: Why Apps Get Shut Down During Cost-Cutting and How Multi-Store Delivery Orders Work Behind the Scenes.
