Observed Signal · Aug 14, 2026 · Technical Release · Source: DEV Community · Impact: 1/5 · Sentiment: Neutral
Client-side semantic search without server or vectors
A technical post describing a client-side semantic search engine for a 796-page static site that runs entirely in the browser with no server-side model or hosted vector DB. The implementation ships three static JSON artifacts (lex.json, index.json, body.json) and a single 401-line JS ranking engine. It uses a Model2Vec-style distilled per-word 384-dimensional vector table (quantized to int8) derived from Xenova/all-MiniLM-L6-v2, BM25 lexical and full-text channels, and Reciprocal Rank Fusion (RRF, k=60) on ranks rather than scores. The design favors privacy (no third-party embedding calls), progressive loading of channels, and deterministic, testable behavior; the article also documents concrete tradeoffs (loss of context, accent/tokenization issues, coverage drift) and measurements showing where the approach excels or fails. Published 2026-08-14.
A practical, privacy-preserving client-side retrieval design for static sites with measured tradeoffs; technically interesting to publishers and engineers but narrowly scoped and not industry-shifting for AdTech at large.
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Key Takeaways & Evidence Grounding
- The site has 796 indexed pages and the search engine ships as three static JSON files (lex.json: 588 KB brotli, index.json: 3.39 MB, body.json: 1.39 MB).
- The semantic channel uses a distilled per-word 384-dimensional vector table (Model2Vec) derived from Xenova/all-MiniLM-L6-v2 over the corpus vocabulary, with document vectors quantized to int8 and base64-encoded.
- Retrieval fuses three channels (semantic cosine similarity, BM25 over title/dek/tags, BM25 over page prose) by Reciprocal Rank Fusion (RRF) with k=60, plus a deterministic exact-title override.
- Search runs fully client-side (in-browser), with progressive loading of channels and identical ranking code reused in Cloudflare Worker and Node harnesses for deterministic results.
- Publication date (article metadata): 2026-08-14.
Connected Companies & Entities
2 Entities mapped“The Cloudflare Worker imports it as ESM for our MCP server at `POST /mcp`, so an AI agent calling `search_strata` runs the same ranking a hu...”
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