Open-source search API with BM25F ranking, typo tolerance, and sub-50ms autocomplete. Same quality as Algolia — flat pricing from $0/month, no per-request fees.
MIT licensed · No per-request fees · Sub-50ms autocomplete · Free tier forever
// Initialize LumoSearch const client = new LumoSearch({ apiKey: 'lum_8291_x92', host: 'https://api.lumosearch.com' }); // Perform a high-relevance search const results = await client.search('index_v1', 'fast search engine', { limit: 10, attributesToHighlight: ['title', 'description'], matchingStrategy: 'last' });
Everything you need to build world-class search experiences without the infrastructure headache.
Industry standard ranking algorithm tuned for precision and high relevance across your documents.
Handles typos and misspellings gracefully, ensuring users always find what they're looking for.
Sub-50ms response times for real-time search-as-you-type interfaces.
A developer-first REST API and client libraries that feel natural in any tech stack.
Boost relevance by assigning custom weights to titles, tags, or body content.
Easily identify and display matching snippets within large documents automatically.
The same search quality as Algolia, at 1/3 the cost. No hidden fees, no surprises.
Compare: 50K searches on Algolia = $75/mo · On LumoSearch = $29/mo
For testing and evaluation
Ideal for: Side projects, testing
For side projects and small apps
Ideal for: Blogs, personal sites, prototypes
For small production apps
Ideal for: Docs sites, small stores, SaaS
Most Popular
For growing applications
Ideal for: E-commerce, SaaS, high-traffic sites
For mission-critical search
Ideal for: Enterprise, large-scale platforms
All plans include: API access · Fuzzy search · Instant autocomplete · Highlight ranges · Free tier included
Need more than 2.5M searches/mo? Contact us for custom enterprise pricing.
LumoSearch is an open-source search API that uses BM25F ranking, fuzzy matching, and instant autocomplete. You can self-host it or use LumoSearch Cloud for managed hosting.
LumoSearch is open-source with flat monthly pricing (no per-request fees). It uses the industry-standard BM25F algorithm and runs serverless — no binary dependencies or persistent servers required.
The open-source engine is MIT-licensed and free forever. LumoSearch Cloud has a free tier with 1K documents and 500 searches/month. Paid plans start at $39/month.
Autocomplete responses return in under 50ms. Search queries with BM25F scoring, fuzzy matching, and highlight extraction typically complete in under 100ms. Indexes are cached in Lambda memory for low-latency access.
Yes. LumoSearch Cloud supports optional semantic reranking using OpenAI, Gemini, or Bedrock Titan embeddings. Lexical BM25F results are blended with cosine similarity scores for hybrid search.
Yes. The core search engine is MIT-licensed and runs anywhere JavaScript runs — Node.js, Lambda, Cloudflare Workers. LumoSearch Cloud adds managed hosting, API keys, usage tracking, and semantic search.
Algolia charges per search request and per record. 50K searches on Algolia costs around $75/month. The same volume on LumoSearch Cloud costs $39/month with flat pricing — no surprises as traffic grows.
LumoSearch has a REST API that works with any language. The official SDK supports JavaScript and TypeScript. It integrates with React, Next.js, Vue, and any framework that can make HTTP requests.
The power of LumoSearch, managed for you. Focus on your product, not your search infrastructure.