Directory
Algolia
Hosted keyword search API
Free tier + paidSearch, vector & RAGalgolia.com
What it is
The incumbent hosted search-as-a-service: you push records to an index over an API and get typo-tolerant, sub-50ms keyword search with faceting, synonyms and analytics. Free tier covers 10,000 search requests and 50,000 records per month. Not self-hostable — it is closed SaaS.
Why it earns a slot
InstantSearch UI widgets for React, Vue and vanilla JS mean a working search box in an afternoon, and DocSearch is free for open-source docs sites. Models know its API surface cold.
Know before you commit
Billing is per search request, not per user — an as-you-type box fires a request per keystroke unless you debounce. Costs scale with traffic, fast.
Getting started
npm i algoliasearch react-instantsearch
Neighbourhood
How Algolia sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.
Also in Search, vector & RAG
Brave Search API
brave.comNot yet swept
Independent web index search API
PaidSearch, vector & RAG
$5/month in free credits applied automatically; no standing free query allowance. Search $5 per 1K requests at 50 QPS. Answers $4 per 1K requests plus $5 per million input/output tokens at 2 QPS. Enterprise custom.
Open dossier
Chroma
trychroma.comNot yet swept
Embedded vector DB + cloud
Free tier + paidSearch, vector & RAG
OSS free (Apache 2.0). Chroma Cloud Starter: $0/mo base with $5 free credits, then usage. Team $250/mo + usage with $100 credits. Rates: $2.50 per GiB written, $0.33 per GiB-month stored, $0.0075 per TiB queried, $0.09 per GiB returned.
Open dossier
Cloudflare Vectorize
developers.cloudflare.comNot yet swept
Serverless vector DB on Workers
Free tier + paidSearch, vector & RAG
Workers Free: 5M stored vector dimensions, 30M queried dimensions/mo. Workers Paid ($5/mo): 10M stored and 50M queried included, then $0.05 per 100M stored dimensions and $0.01 per million queried dimensions.
Open dossier
Elastic Cloud
elastic.coNot yet swept
Managed Elasticsearch + vector
PaidSearch, vector & RAG
14-day free trial. Cloud Hosted from $99/mo Standard (120GB storage, 2 zones); Gold $114, Platinum $131, Enterprise $184. Serverless from $0.047 per GB retained/mo, $0.09 per search VCU-hour, $0.14 per ingest VCU-hour.
Open dossier