Kaffeine Kanishka Chakraborty

Work

Three things I build and maintain.

SketchPad

Design, engineering, release · 2020 – present

A drawing app for iPhone and Android. The iOS app was written from scratch in Swift rather than ported.

  • 2.8M+lifetime installs
  • 4.5★across all countries
  • 0.00%crash rate, 28-day report dated 2026-09-20
  • 129K+active devices, 28-day report dated 2026-09-20
  • On iOS, a custom raster engine uses transactional history to preserve undo and redo when a stroke is cancelled.
  • On iOS, Fill runs off the main thread from an immutable snapshot.
  • No accounts and no backend. The app contacts no server of mine at all.

Unmessify

Co-built at a hackathon, maintained since · 2022 – present

A hostel app for VIT Chennai students — mess menu, announcements and laundry schedule. Built in under 24 hours with Teesha Saxena, then maintained for years afterwards.

  • 4.8★average rating
  • 5,000+downloads
  • Unofficial and independent, with no university affiliation.
  • Deliberately narrow in scope: it does three things students actually asked for.

M³Colors

Author · 2023 – present

An open-source App Inventor and Kodular extension that gives apps the Material You colors of the phone they run on.

  • Open source under MIT since 2025.
  • Unmessify’s interface is built with it.

Working on something?

If any of this looks useful, I’m easy to reach.

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