01 / 04
The network listened for one tone.
Long-distance trunks in the old analogue phone network used a 2600 Hz tone to mean “idle”. Play it down a connected line and the far switch assumed the call had ended, then waited for new routing digits.
Pranshul Chandhokaka 2600th
Make the uncertain operable.
I lead product and technology for Interior Company at Square Yards. Fourteen years across games, XR, design software and AI, and I still ship code on the side.
- 14+ years building
- GreyKernel co-founder, CTO
- IN 395331 patent co-inventor
SF tone
Locked
Drag off 2600 Hz to break the signal. Turn sound on to hear it.
01 Why 2600th
2600th comes from a tone I learned about in college. It stuck.
I was into computers and gaming from an early age. In college, between 2007 and 2011, I got interested in hacking and its history. Watching a documentary about it, I found the phone phreaks, the Cap’n Crunch whistle, the 2600 Hz hack, Kevin Mitnick’s story and a lot more.
Skip the story, see the work02 / 04
A cereal-box whistle could make it.
A toy whistle given away in boxes of Cap’n Crunch happened to hit 2600 Hz. Blown into a handset, it could seize a long-distance line, and one phreaker took the name Captain Crunch.
03 / 04
Then came the blue box.
Phreakers built boxes that played the network’s own routing tones, two frequencies at a time. Understand the signalling and you could route a call anywhere. Carriers eventually moved signalling out of band, and the trick stopped working.
04 / 04
The weakest link was a person.
Kevin Mitnick started out as a phone phreak and became one of the most wanted hackers in America. Much of his access came from talking people into giving it to him. His story is the reminder that a system includes the people who run it.
The instinct stayed.
Learn how a system actually works, people included, then make it do something new. Today the systems are rendering engines, design tools and AI models, and the job is turning them into products people can operate.
Experience at a glance
14+
Years building Games, XR, design software and AI
2015
Co-founded GreyKernel Six years leading its technology
395331
Indian patent Co-inventor, humanoid robot control
Sep 2026
Still shipping Latest: DLSS 5 Video Player
02 Selected work
Trunk lines
Six systems I led or built, across design software, applied AI and immersive training. Tune a line to preview it.
- L·01BlocksA browser-based interior-design system connecting spatial planning, product choices, pricing, quality checks and production handoffs. I lead its product and technology work.
- L·02DesignestoAn AI design studio for spaces: explore room directions, revise existing rooms, and move from sketches to renders and 360° experiences.
- L·03PropVR AI → CraftI built the initial 22-tool AI MVP across five workflow studios. PropVR’s team developed it into Craft, a public creative platform for AEC.
- L·04SpaceCraft ProPrincipal software architect at HomeLane on a real-time room editor connected to pricing, CAD and manufacturing workflows.
- L·05Enterprise XRAt GreyKernel: helping set up JPMorgan Chase’s Mumbai immersive lab, Anglian Water training software and VR empathy exercises in Singapore.
- L·06IRA VRImmersive classroom learning at GreyKernel: the learner applications and the tools teachers used to run sessions.
03 Call log
Four eras, four signals
How I got here, from shipping mobile games to leading product and technology. Each era sounded different. The longer version
2012–14
Games
Square wave
Game programmer on mobile games, then cross-platform Unity at Merkur. I learned to care about how software feels on the device someone actually owns.
2015–21
GreyKernel
Sine wave
Co-founded GreyKernel and led its technology for six years: immersive learning, enterprise training, games, and a patented humanoid robot control system.
2021–23
HomeLane
Sawtooth
Principal software architect on SpaceCraft Pro. Real-time 3D stopped being a demo and became part of pricing, CAD and manufacturing.
2024–now
Square Yards
Signal from noise
VP Product & Technology, Interior Company. Deciding where generation helps and where a product has to be exact.
04 Side channels
Independent builds
Open source, public and runnable. This is where I learn a technology by shipping something with it.
v0.26.2 · 26 Sep 2026 · Windows · RTX
DLSS 5 Video Player
A free, open-source player that puts any video through NVIDIA’s DLSS 5 neural renderer and checks every frame against the original.
It renders while you watch, then gives you split, wipe, difference and loupe views of what the model changed. Its own documentation includes a frame where the model makes the picture worse.
- Renders while you watch Nearest frames first
- Saves each comparison Images record the frame, view and settings
- Verifiable builds Checksums, plus attestation for the core package
Community project, not an NVIDIA product. The neural runtime is an unsigned community build; the README explains how to verify each file or supply the runtime yourself.
ActiveKinema
A third-person game and its level editor in one browser tab, written in TypeScript with Rapier physics.
- Live demo
Web Ocean 3D
An interactive ocean with weather and a boat to pilot. Sharing it exposed a texture budget I wasn’t measuring.
Live demoSafed Sagar
A fictional MiG-21 reconnaissance flight over procedurally generated Himalayan terrain, built and released in days.
Live productLittle Wonder
A storybook maker that turns a child’s ideas and drawings into an illustrated book, with a cover and a printable PDF.
- Source
Code with AI starter pack
A drop-in operating manual for coding agents: one AGENTS.md that Codex, Claude Code, Cursor and Copilot all follow.
- Standalone deck
Dwarkesh × Jensen
An unofficial reading companion to the interview, with searchable explanations linked to the original timestamps.
- Archived
Ghost Terminal
My earlier portfolio, built as a command line. Still there if you want to type.
05 Writing
Transmissions
Field notes, technical teardowns and essays, written while the work is still fresh.