Kagi

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Do not build this. A search index is the product, and nobody builds one.

Crawling the web at scale, plus licensed result sources, is what a search engine is. The subscription model is the interesting part — you are the customer rather than the inventory — but that is a business decision, not something to reproduce.

WHAT TO DO INSTEAD
- Keep it if you value results nobody has optimised for advertising. That is a real thing to pay for
- If you use it once a week, the free engines are free

WHAT YOU CAN BUILD, AND SHOULD

**Search over the things you have already read**, which no engine can do because it does not have them:
- Archive every page you save: the extracted article, and a single-file copy with the images and stylesheets inlined so it survives the site disappearing
- Full-text index the contents with FTS5, not just the titles. Searching only titles is what makes most bookmark tools useless after a year
- Your browser history, your notes, your highlights and your saved pages in one index, searched together
- Ranked by recency and by whether you opened it before
- Instant, local, and private by construction

That is a weekend, it is covered under Raindrop and Instapaper elsewhere in this catalogue, and it answers the question a search engine cannot: 'where was that thing I read'.

AND THE SMALL THING WORTH HAVING
A per-domain preference list — sites you want first, sites you never want to see — is the feature people actually love about the paid engine, and it is a browser extension that rewrites result pages if you want it on a free engine. A hundred lines, and it is yours.

THE HONEST NOTE
Paying for search removes the incentive to optimise your attention, which is a genuine argument. Just do not confuse it with a technical one — the code here is not what you are buying.

THE ONE-LINE VERSION
Nobody builds an index. Build the search over what you have already read, which no engine has.