Intelligence that stays on-device

Open-source chatbots that run entirely in your browser. A transformer embedding model, BM25 sparse retrieval, dense-sparse ensemble ranking, a 25-feature MLP policy network, and fragment-based composition — zero servers, zero LLMs, zero telemetry.

Game Theory Chat Golden Age Inquiry Data Science Chat Source

Privacy-first Browser-based Open-source No LLMs

How It Works

01 Embed

Sentence Embedding

sentence-transformer (MiniLM-L6-v2) downloads once, caches in your browser, and runs fully on-device. A one-time warm-up — then it's yours forever.

02 Signal Layer

Multi-Signal Extraction

BM25 sparse retrieval, entity extraction, ensemble dense-sparse ranking, and temperature-calibrated intent scores are fused into a structured DecisionPacket — all locally.

03 Decide

Policy Network

An MLP policy network (13K parameters, RL-trained) determines mode, intent, topic count, creativity, and tone from your extracted features.

04 Compose

Fragment Composition

Fragment-based assembly with linguistic connectors, comparison openers, and tone modulation produces precise, varied, natural-sounding answers.

05 Render

KaTeX & Session Memory

Responses render with KaTeX math, formatted text, and session memory for follow-up context — all without a server round-trip.

Features

On-Device AI

Transformer runs entirely in your browser. No data leaves your machine — not even embeddings.

Privacy-First

No accounts, no cookies, no tracking, no server processing. Just you and your browser.

Open Source

Fully transparent MIT license. Inspect the code, fork it, extend it. Built for the community.

No LLMs

Deterministic, explainable responses. No hallucinations, no API costs, no vendor lock-in.

LaTeX Support

Mathematical notation rendered beautifully with KaTeX. Perfect for game theory, statistics, and ML formulas.

Browser-Based

Works anywhere with a URL. No installs, no dependencies. Desktop, tablet, or mobile.

Game Theory Chat

On-device NLU assistant for Nash equilibrium, Shapley value, auctions, prisoner's dilemma, and more. Ask in natural language — get precise, mathematical answers with LaTeX rendering.

Strategy On-device AI LaTeX Mathematics

Launch Chat

Game Theory Chat

How do I find the Nash equilibrium?

For a 2x2 game, check each player's best response. If both play best responses to each other, that's a Nash equilibrium.

$u_i(s_i^*, s_{-i}^*) \ge u_i(s_i, s_{-i}^*)$

Can you compute the Shapley value?

Golden Age Inquiry

Explore the scientific and philosophical discoveries of the Islamic Golden Age. Ask about Al-Khwarizmi's algebra, Ibn al-Haytham's optics, the House of Wisdom, and the scholars who shaped modern science.

History of Science Philosophy On-device AI Mathematics

Launch Chat

Golden Age Inquiry

Who was Al-Khwarizmi?

Al-Khwarizmi (c. 780–850) founded algebra and introduced algorithms. His name gave us "algorithm" and his book gave us "algebra."

He worked at the House of Wisdom in Baghdad, synthesizing Greek, Indian, and Persian mathematics.

What is the Tusi couple?

Data Science Chat

On-device NLU assistant for data science and machine learning. Ask about pandas, NumPy, statistics, classification, regression, clustering, feature engineering, model evaluation, and more — all running locally in your browser.

Data Science On-device AI Statistics Machine Learning

Launch Chat

Data Science Chat

What is logistic regression?

Logistic regression models the probability of a binary outcome using the logistic function $\sigma(z)=1/(1+e^{-z})$, where $z=\beta_0+\beta_1x_1+\cdots+\beta_px_p$.

It's a linear model for classification — despite the name, it's used for predicting classes, not continuous values.

Explain cross-validation

About

ReLU.chat is an open-source experiment by Yunus Emre Vurgun to discover simpler, faster ways to build chatbots — without creating an LLM or relying on pre-LLM era chatbot logic.

The goal is to combine sentence transformers, BM25 sparse retrieval, reinforcement-learned policy networks, and fragment-based composition into a system that runs entirely in the browser. No servers, no API keys, no data collection. The power stays on your device, achieving absolute data privacy for anyone who uses it.

yunusemrevurgun.com Source Code