langsearch
LangSearch provides a free web Search API and a free Rerank API that deliver natural-language search over billions of web documents and a semantic reranker optimized for LLM applications and AI agents.
langsearch is ai agents software teams evaluate for ai agents. Use this page to review pricing, integration signals, and the best alternatives before you commit.
Profile facts come from the vendor source. AiMatch labels unknown pricing or API details instead of estimating them.
Review official source →Used in These Packs
Quick Overview
Best for: AI Agents
What it does
AI Agents software for decision-makers comparing workflow fit and alternatives.
Best fit
AI Agents
Pricing snapshot
Freemium from Free (no credit card required)
Next step
Compare langsearch with similar tools before you shortlist it.
Compare this tool before you shortlist it
Review alternatives, pricing posture, and workflow fit side by side.
langsearch
LangSearch is a provider of web search and semantic reranking APIs designed for LLM-driven applications and AI agents. The service offers a Web Search API that supports natural language queries across billions of web documents (including news, images, and videos) and a separate Rerank API driven by a transformer-based LangSearch reranker. The platform emphasizes delivering clean, accurate, high-quality context for LLM applications, with tooling and integrations for direct API calls, LLM function calls, LangChain examples, and AI agent plugins. LangSearch offers a free tier and positions itself for integration into AI search, chatbots, retrieval-augmented generation (RAG), and other production workflows.
Web search and rerank API for LLM applications, providing accurate context.
Own this listing?
Claim this page for a one-time $29 to add pricing, features, screenshots, verified owner details, and a clearly labeled 30-day category position after the profile is live.
Claim this listing for $29Key Features
Natural Language Web Search API
A Web Search API supporting natural language search across billions of web documents, including news, images, videos, and more.
Free Rerank API
A semantic rerank API (langsearch-ranker) to boost search result accuracy; described on the site as 'Absolutely Free, No credit card required.'
Hybrid search & semantic reranker
Support for mixed keyword and vector searches using a hybrid search database and semantic reranker to improve relevance.
Lightweight transformer reranker
LangSearch Rerank model based on transformer architecture that achieves ranking performance comparable to 280M–560M models while using ~80M parameters for faster inference and lower cost.
Easy integration with LLM tooling
Direct API integration plus examples and mentions of using LangSearch via LLM function calls, LangChain, and AI agent plugins.
API options: freshness, summary, count
The API example demonstrates request parameters such as 'freshness', 'summary', and 'count' to control results and summaries.
Pricing
Free access to the Web Search API and Rerank API for evaluation; the site repeatedly advertises 'TRY FREE' and 'Absolutely Free, No credit card required.'
Free
Free (no credit card required)- Access to Web Search API and Rerank API to try for free
- Basic API usage for evaluation
Use Cases
LLM augmentation and RAG
Provide web context and high-quality search results to retrieval-augmented generation (RAG) systems and LLMs.
AI Agents and Chatbots
Integrate search and reranking into AI agents and chatbots to enable up-to-date and relevant responses from live web content.
Custom search workflows
Call the LangSearch API from custom applications or workflows with filtering options and hybrid (keyword/vector) search support.
Integrations
LangChain
Site includes a LangChain example showing how to call LangSearch from a LangChain workflow and use function calls.
LLM tools & AI agent plugins
Described integration paths for LLM function calls, agent plugins, and embedding the API into AI agents, chatbots, and RAG systems.
Benefits
Limitations
Frequently Asked Questions
No verified FAQs are available.
Getting Started
- 1 Step 1: Visit the LangSearch site and sign up or click 'START FOR FREE' (no credit card required).
- 2 Step 2: Retrieve an API key and review the API example (curl example for 'https://api.langsearch.com/v1/web-search' is provided on the page).
- 3 Step 3: Integrate with your application or LLM toolchain (examples show LangChain and LLM function call usage) and call the Web Search or Rerank endpoints with parameters like 'query', 'freshness', and 'summary'.
Support
docs
The site lists 'DOCS' / Documentation as a resource for API usage and examples (documentation label present on the site).
site pages
Site includes legal and informational pages (Privacy Policy, Terms of Service) and product pages for Database, Reranker, API, and Docs.
API
Documentation and example API usage are linked or shown on the site (page includes a curl example and a JSON response example), exact documentation URL not provided in supplied content.
Compare langsearch with similar tools
See how it stacks up against alternatives
Related Tools
View all 496 →
Needle2
Needle 2 is an open, production-ready 45M-parameter agentic LLM from Cactus designed for tool calling, device control, and structured extraction on extremely small devices; the shipped CQ2-bit binary is ~14 MB and runs in ~28 MB of RAM across Cortex-M, microcontrollers, phones, Raspberry Pi and WebAssembly.
Oodle.ai
Oodle Agent Observability provides agent/LLM observability at scale with S3-backed columnar storage, fast search (<1s P99), out-of-the-box AI-powered insights, and flat ingestion-based pricing designed to retain 100% of traces affordably for debugging and optimizing production agents.
Sentinel
Sentinel is an open-source (MIT) autonomous QA agent that reads a codebase to derive end-to-end business flows and tests them across frontend and backend, combining deterministic repo recon, model-driven planning, Playwright browser automation, and backend assertions.
Nous
Nous is an open-source context graph for agentic GTM (go-to-market) teams that centralizes identity-resolved people and company data from multiple GTM tools so agents can read a single, source-traced account context in one call. It is available as a hosted service and as a self-hostable stack.
Premium Alternatives
AletheionAGI
AletheionAGI provides a grounded-memory layer for AI systems that enforces evidence-bound delivery, namespace isolation, and policy authorization so AI readers cannot produce unsupported claims. It's targeted at production-facing use cases like customer support, commerce agents and internal copilots.
ClaudeThings
ClaudeThings provides a packaged, continuously-updating set of 89 specialized agents, 103 pre-built skills, and 181 slash commands that act as an AI engineering and marketing team for Claude Code — delivered as a private GitHub repo and installed with a single npx command. It adapts to any stack via a CLAUDE.md project manifest and is sold as a one-time purchase with lifetime updates.
qomplement
qomplement is an Agentic AI-driven ERP built for supply chain and operations teams that automates tasks across procurement, inventory, freight, finance, and planning to reduce manual work and scale operations without adding headcount.
lunarlink-ai
LunarLink is a beta web app that lets users access and compare multiple advanced AI models (including ChatGPT, Claude, and Gemini) side-by-side, with pay-as-you-go pricing matched to first-party API rates and a privacy-first chat experience.
Wonderchat
Wonderchat is an AI concierge platform that builds site-embedded chat agents to deflect repetitive support questions, qualify leads, and answer using your approved content with citations; built for teams across SaaS, industrial, healthcare and e-commerce and deployable in minutes.
Miro
Miro is a collaborative visual workspace and AI platform that integrates intelligent agents (Sidekicks), visual multi-step workflows (Flows), and connectors to bring team context and external data into a shared canvas to accelerate planning, design, and decision-making across organizations.