Inside SpectraLens AI: Architecture for Multi-Engine Browser AI with Zero API Costs
How I designed a Manifest V3 Chrome extension that queries leading AI models simultaneously through signed-in web sessions without token costs.
Crafted by Sourav. ElseSourav is my personal space for the applications I build, the ideas I explore, and the things I learn along the way.




























A curated selection of software, developer tools, games, and systems.
Discover all 19 open-source experiments, production tools, and native software.
Things I write about while building software, learning tools, and solving architectural problems.
Lessons learned writing custom backpropagation matrix routines in C++ and compiling them with Emscripten -msimd128 for real-time handwriting recognition.
How to build a single-board WiFi RC car by serving an embedded web controller and driving an L298N motor controller directly with ESP32-CAM GPIOs.
Building thoughtful software, useful tools, and digital experiences with a focus on usability, performance, accessibility, and engineering quality.

Designed and engineered solo with care for every interaction.
Zero telemetry spyware, zero ads, and zero dark patterns.
Lightweight, snappy response, and minimal resource usage.
Practical tools and games created to solve real daily needs.
Talk directly with the builder—feedback is read and valued.
Actively maintained with modern web standards and care.
Every application, utility, and update is built independently with a focus on craft, performance, and usability.
Browse full collection of software, utilities, and developer tools.
Technical write-ups, architecture breakdowns, and learnings.
Background, engineering evolution, and studio principles.