Practical software built on open source

Kakiokoshi (書き起こし)

Real-Time Speech Transcription for Hearing Assistance

Installable PWAMIT

An elderly-friendly real-time speech-to-text Progressive Web App crafted for individuals with hearing difficulties. It transforms live group conversations, family gatherings, and doctor visits into high-contrast, color-coded visual dialogue.

• ✓Real-time speaker diarization separating multiple speakers into color-coded speech bubbles.
• ✓Tap-to-mute noise sources to instantly silence background TV or side chatter.
• ✓Acoustic Voice Fingerprint (pitch & ONNX neural profile) to automatically highlight your own voice.
• ✓Companion 90-day encrypted History Reader Web UI with one-click .txt transcript export.

Visor de Tarifa Eléctrica

Spain Electricity Prices (PVPC) & Generation Mix

Installable PWAMIT

Interactive Web UI and installable Progressive Web App (PWA) to consult, compare, and visualize Spain's hourly electricity costs and power generation sources using official real-time data from Red Eléctrica de España (REE).

• ✓Hourly electricity tariff breakdown comparing regulated PVPC and spot market prices in interactive charts or tables.
• ✓Track daily power generation split among wind, solar PV, nuclear, hydro, combined cycle and other sources.
• ✓Renewable vs. non-renewable generation split evolution over monthly periods.
• ✓Regional filtering by Spanish Autonomous Communities (CCAA) with persistent local preferences.

Self-Hosted PlatformGPL-3.0

An open-source, containerized multiplayer quiz platform designed for schools, academies and organizations. Built as a simple self-hostable alternative to Kahoot and Quizups that maximizes student engagement while preserving strict student privacy.

• ✓Mobile-first Pupil client with Framer Motion gamification (confetti, screen shake, streak multipliers) and zero student accounts (6-digit PIN join).
• ✓Professor Dashboard featuring a reusable Quiz Library, Theme Studio (custom colors, fonts & school logos), and Classroom Projector Host mode.
• ✓Millisecond speed scoring and granular session analytics stored in Redis and PostgreSQL.
• ✓Cloud-native Docker Swarm stack with Traefik v3 automatic TLS and ultra-lightweight Garage S3 multimedia streaming (images, audio, video).

Visor de Catastro

Spain Real Estate Properties & Cadastral Parcel Explorer

Live Web AppMIT

Web application to consult and visualize urban and rural real estate properties across Spain using official public services from the Dirección General del Catastro and Instituto Geográfico Nacional (IGN).

• ✓Multimodal search by 14/20-char Cadastral Reference, postal address (with automatic floor/door resolution), GPS coordinates, or direct map click.
• ✓Interactive Leaflet cartographic viewer overlaying high-resolution IGN PNOA satellite orthophotos and real-time INSPIRE cadastral parcel boundaries.
• ✓Detailed breakdown of urban building units, constructed area, and rural agricultural subparcels/crops with AI-ready property summaries.
• ✓Direct Google Maps navigation and step-by-step guide to request the official Property Registry report (Nota Simple).