Karthik Kannaiyan logoKarthik Kannaiyan

Build

Things I build

Beyond consulting and client work, I design and ship practical things — independent products, interactive decision-making tools, and hands-on simulations that make complex systems tangible.

Products

Things I have built

Alongside consulting and client work, I build tools that solve problems I encounter in my own work.

VersionTrail

Live

Never lose a version of your work again.

  • Windows
  • Python
  • Utilities & Tools
  • Microsoft Store

The story

Every developer, writer, and designer knows the moment — you are deep in a presentation, a Photoshop file, or a codebase, and Ctrl+Z runs out. The undo history only goes so far. Getting back to an earlier version means either losing hours of work or spending more time hunting through autosaves than it would have taken to just redo it from scratch. I had this frustration for years. What I always wanted was simple — every time I press Ctrl+S, make a copy. Silently, automatically, with a timestamp. So I always have a trail to go back to. In 2026 I finally built it myself. VersionTrail does exactly that and nothing more.

What it does

Monitors any file or folder in real time. The moment you save, it creates a timestamped backup automatically — no effort required.

Key features

  • Three monitoring modes — single file, folder, subfolders
  • Timestamped backups on every save
  • Smart debouncing — no duplicate backups
  • Live activity log with filters
  • System tray — runs silently in background
  • Lightweight — minimal CPU and memory
Microsoft StoreFree trial

Tools

Decision-making tools

Interactive calculators and estimators built to answer real questions — sized for engineers, analysts, and decision makers evaluating AI, infrastructure, and analytics choices.

Simulations

Learn by playing the system

Interactive simulations that put you inside a system and let you feel how it behaves — then unpack the why. Hands-on models of the ideas that matter in operations, strategy, and systems thinking.

Let's connect and exchange insights. - Always open to discussing the future of digital transformation, local LLM deployment, or data-driven M&A strategy.

Let's Talk Tech