01
Opensolr
A complete website search platform with managed Solr hosting
Opensolr provides AI site search and managed Apache Solr hosting. It offers hybrid vector search, a RAG API, and web crawling capabilities.
96.0
Best AI search API providers with a free plan in 2026
10 ranked, with a plain verdict on every entry.
Opensolr ranks first among the top 10 AI search API providers with a free plan in 2026, with a Lister Score of 96.0.
Opensolr comes first on this list for Drupal and WordPress developers seeking integrated search solutions. Agentset is built for developers building production RAG apps. Octen serves AI agent developers, and achieves top accuracy on SimpleQA and FreshQA Strict benchmarks.RANKENTRYSCORETRENDFROM
5
AlgoliaThe AI tool provides average response times of less than twenty milliseconds90.0NEW1 Dollar per 1000 requests
AlgoliaThe AI tool provides average response times of less than twenty milliseconds90.0NEW1 Dollar per 1000 requestsCURATED · UPDATED REGULARLY
The ranking, in detail
02
Agentset
Build AI chat and search
Agentset provides infrastructure for developers building production-ready RAG applications. It powers search and Q&A inside products with reliable answers.
92.0
03
Octen
Real-time search infrastructure with low latency and high reliability
Octen provides a real-time web search API for AI agents. It offers a complete retrieval stack including extraction and embedding models.
92.0
04
You.com
The AI search assistant for your mind
You.com enables developers to extract clean content and generate grounded answers with high accuracy.
92.0
05
Algolia
Algolia is a retrieval intelligence platform that transforms user intent into precise outcomes. It delivers effortless discovery by understanding context and surfacing relevant content instantly.
90.0
06
Face Search AI
Search the web with a face
Face Search AI is a free reverse face search engine that finds where a face appears on the public web. It processes one photo to locate credible matches across millions of indexed images in seconds.
90.0
07
SearchJet
Ship production search in minutes, not quarters.
SearchJet provides lightning-fast search with typo tolerance, semantic ranking, and real-time indexing for websites and apps.
90.0
08
Tavily
The web access layer for AI agents
Tavily provides a secure API for real-time web access to AI agents. It enables search, extraction, research, crawling, and mapping within production workloads.
90.0
09
Parallel
Web infrastructure for AI agents
Parallel provides web infrastructure for AI agents to search and reason. It gives agents real-time access to fresh context from the web.
88.0
10
TXYZ
Integrate all paths to knowledge
TXYZ integrates all paths to knowledge for researchers. It provides AI assistance for reading, problem solving and more.
88.0
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Positions 1, 2 and 3 are available to buy for twelve months.
Frequently asked questions
What is the best AI search API providers with a free plan?
Opensolr ranks first on Lister. Opensolr provides AI site search and managed Apache Solr hosting. It offers hybrid vector search, a RAG API, and web crawling capabilities.
What are the top 10 AI search API providers with a free plan?
1. Opensolr; 2. Agentset; 3. Octen; 4. You.com; 5. Algolia; 6. Face Search AI; 7. SearchJet; 8. Tavily; 9. Parallel; 10. TXYZ.
Are there free options for AI search API providers with a free plan?
No free option is confirmed in the recorded pricing for this ranking. Check each provider's pricing page for current plans and trials.
What do the top two say they are built for?
Opensolr says it is built for Drupal and WordPress developers seeking integrated search solutions, and Agentset for developers building production RAG apps.
What should a buyer check before signing up?
Opensolr states that shared plans enforce strict per-IP rate limits to protect infrastructure, and Agentset that the AI tool does not include custom format support on lower tiers. Face Search AI states that the AI tool only indexes public pages and cannot access private accounts or CCTV footage. Those are the limits each AI tool publishes itself, not a full account of any plan.
