Find 18 Best Retrieval Augmented Generation (RAG) Software with API Integration in November 2026

What is LlamaIndex?

LlamaIndex is an open-source data framework for building LLM-powered applications over private and enterprise data. It provides the tools to ingest, structure, and retrieve data for LLM context: document loaders for 100+ data sources, chunking and indexing pipelines, retrieval strategies ...

What is Unstructured?

Unstructured turns documents into the clean, ordered text a retrieval pipeline needs, through a transform API, a Model Context Protocol server and scheduled pipelines that move content from a source system into a destination store. Deployment runs from the hosted service to a dedicated ...

What is Amazon Kendra?

Amazon Kendra is an index service rather than a packaged application: a developer provisions capacity, points connectors at sources such as Confluence, SharePoint, Salesforce and Google Drive, then calls a query API for search or a retrieve API to ground a generated answer. Billing follows ...

What is ZeroEntropy?

ZeroEntropy trains reranking and embedding models and runs a search API on top of them. The model line covers zerank-2 in three sizes and the zembed-1 embedding model, alongside custom work on context compression, query rewriting and fine-tuning. Access is an API key with Python and TypeScript ...

What is Voyage AI?

Voyage AI supplies the embedding and reranking models a retrieval pipeline runs on, now published under MongoDB. The range covers general text, long context, code, finance and legal variants, and rerankers in full and light sizes. Access is consumption based through the company’s own endpoint, ...

What is Morphik?

Morphik ingests documents, including their images and layout, and answers questions over them, with a research agent for longer investigations and community graph templates to start from. The core is published on GitHub, and higher plans move the deployment into a dedicated instance in an ...

What is mixedbread?

mixedbread runs indexing, keyword and semantic search, optional reranking and storage as one managed stack, alongside Toast 1, a search model and agent aimed at knowledge work. Rates are published per unit and apply on every plan: indexing is $1.50 per million content tokens at speed or $3 at ...

What is Contextual AI?

Contextual AI sells a hosted platform for agents that answer from a customer’s own documents, covering query optimisation, retrieval, reranking, filtering, generation and a groundedness check, with prebuilt agent templates. The same pieces are also sold separately for teams that keep their own ...

What is Ragie?

Ragie runs the whole retrieval sequence behind one API: ingestion and parsing, hybrid and hierarchical search, reranking, partitions, entity extraction and recency bias, with a Model Context Protocol server for agent clients. Its connector product can be embedded inside a customer’s own ...

What is Reducto?

Reducto reads complex documents and returns structured output, with separate endpoints for parse, extract, edit, split and classify, plus a web studio for reviewing results. Published list rates are per thousand pages: $10 for r-1 parsing, $1 for the smaller r-1 mini, $20 for extraction with ...

What is Parallel?

Parallel sells web search, extraction and research as separate APIs an agent can call, alongside a free hosted Model Context Protocol server for personal use. The published rates start at $1 per 1,000 search requests with ten results included, $1 per 1,000 extracted addresses, $1 per 1,000 ...

What is SerpApi?

SerpApi runs a query against a search engine and returns the result page as structured data, which is how many retrieval pipelines reach public search results without maintaining their own scraping. Plans are sold as a monthly search quota with an hourly throughput guarantee, and faster ...

What is Linkup?

Linkup is a web search API for AI applications with three endpoints: fetch, which reads a single page, search, which returns results in under a second, and research, which works through a longer question asynchronously. Beyond the open web it can hold a private index of a customer’s own ...

What is Firecrawl?

Firecrawl takes a URL or a whole site and returns content a model can read, through endpoints for scrape, crawl, map, search, interact, monitor and agent. Every call draws on one credit balance, so searching and scraping are budgeted together, and paid accounts can top up in $5 increments with ...

What is Tavily?

Tavily is a single API for giving an agent live web access, with endpoints for search, extract, research, crawl and map. It is called from an application rather than opened by a person, and the company runs a European deployment for customers who need requests handled inside the region. Pricing ...

What is Exa?

Exa is a search API built for applications rather than people. Its endpoints cover search, deep search, page contents, a direct answer, monitors that watch a query over time, and an agent that runs a research task from start to finish. Access is an API key, with Python and JavaScript libraries ...

What is Vectorize?

Vectorize is a data pipeline tool for AI engineers and developers building retrieval-augmented generation (RAG) applications who need to convert unstructured documents and data sources into optimized vector search indexes. It automates the chunking, embedding, and indexing steps that developers ...

What is Deepset?

Deepset is an open source solution for developers to build production-ready Natural Language Processing (NLP) systems with ease and efficiency. We offer developers powerful tools to make data processing faster and simpler, while also being devoted to making modern NLP technology accessible, ...