# Krexel

> Krexel is a private, on-device AI assistant for Android that integrates LLMs locally across your keyboard, notes, document search, translation, and local network server.

## Core Features

- **Dynamic GGUF & LiteRT Context Window Mapping**: Industry-first architecture for Android offline AI. Parses GGUF binary headers to dynamically extract context length limits (up to 32k+ tokens) with automated context reloading and fallback handling for LiteRT models, preventing token clipping or OOM crashes.
- **On-Device RAG & OCR Document Intelligence**: Indexes local files, PDF text, and visual OCR scans on-device using ML Kit and PDFBox-Android. Delivers grounded answers with local previews without cloud vector databases.
- **Shareable Local AI Server Endpoint**: Turns your Android device into a private LAN API server for desktop computers, scripts, and smart home tools with API key authentication and rate limiting.
- **Keyboard AI**: System keyboard integration providing zero-latency baseline predictions and optional AI-boosted text rewrites, 100% offline with zero telemetry.
- **Notes AI**: In-place text rephrasing, formatting, summarizing, and translation inside markdown note workflows.
- **On-Device Chat & Translate**: Conversational AI and text translation with zero cloud calls, network delays, or subscription paywalls.
- **Single Shared RAM Model**: All features (Chat, Keyboard, Notes, Translation, Search) share a single loaded model in memory with dynamic context mapping to optimize battery and performance.

## Privacy & Safety

- **100% On-Device Processing**: Runs quantized GGUF models locally via llama.cpp and task models via LiteRT. Zero data sent to cloud servers.
- **Biometric Security Gate**: Sensitive extracted data (identity numbers, credentials, document tags) is encrypted via Keystore AES-256-GCM and requires fingerprint/face unlock to view.
- **Child Safe & Content Filtering**: Configurable Child Safe and Adult safety modes built directly into local inference.

## Pricing

- **Free Forever**: Core features (Chat, Keyboard AI, Notes, Document Search, Local LAN Server) are 100% free with no subscriptions or paywalls. Hardware inference costs are borne by the user's phone.

## Supported Models

- **quantized GGUF & LiteRT Models**: Gemma 4 E2B, Liquid LFM2.5, Qwen 3.5, MiniCPM5, and custom local GGUF imports via app UI.

## Links

- Homepage: https://www.krexel.app/
- Features: https://www.krexel.app/#features
- Document AI: https://www.krexel.app/#document-ai
- Local Server: https://www.krexel.app/#local-server
- Privacy Policy: https://www.krexel.app/privacy.html
- Terms of Service: https://www.krexel.app/terms.html
- Roadmap: https://www.krexel.app/#roadmap