We want AI that thinks in the grey — that remembers what matters, weighs it, and reconsiders. We're building it as three connected pieces: memory, follow-through and reasoning. Each ships on its own. Together they are the assistant.
01—Thesis
Language models can write, code and explain almost anything. But every conversation starts from zero, and every answer is a first draft. The model doesn't know what you decided last week, and it rarely stops to ask whether it's wrong.
We think the next step isn't only bigger models. It's two missing abilities: memory, so context follows you, and deliberation, so a model can hold a problem, revisit it and change its mind.
An assistant with both could do something today's tools can't: know what you've committed to and help you follow through. That's what we're building — one layer at a time, starting with memory and with personal fitness as the first area it serves.
Grey thinking is the space between a quick yes and a quick no — where you weigh, remember and reconsider. That's the kind of thinking we're trying to give machines.
02—Research agenda
What should an AI know about you, across every tool you use, without you having to repeat yourself — and without giving up your privacy?
How do you give an AI the ability to think — not answer in one pass, but hold a problem, revisit it, and notice when it's wrong?
Exploratory. No ship date — this one stays open until we understand it.
03—Products
macOS · launching Q1 2027
The memory layer. The first product from our memory research.
Murmur is a macOS app. Hold the fn key, speak, and the right moments from your past AI conversations come with you — into Claude, ChatGPT, Cursor, anywhere you type.
Building Murmur is how we test our ideas about memory against real work: what's worth keeping, what to bring back, and what should never be captured at all.
Launching Q1 2027. The early access list is open now.
Should I use Stripe Tax or handle VAT manually?
3 memories attached · ready to send
01
Capture
Hold fn and speak. Audio is held in memory only, and text is read only from apps you've allowed.
02
Transcribe
whisper.cpp runs on your Mac. Audio is discarded as soon as it's transcribed.
03
Organise
Transcripts and AI sessions go into a local database, grouped by project.
04
Retrieve
For what you're asking now, Murmur finds the few past moments that matter — decisions, constraints, numbers.
05
Attach
Those moments are added to your prompt before you send it, in whichever AI tool you're using.
On-device speech. Local-first memory. Capture off by default.
iPhone + Apple Watch · launching late 2026
The follow-through layer. An assistant for the commitments you make to yourself, starting with fitness.
04—Notes
05—About
greythinkinglab is an applied AI lab. We're building a personal AI assistant that remembers what matters to you, helps you follow through on what you set out to do, and reasons before it answers. We build it as three connected pieces, each shipped on its own: Murmur, the memory layer; Gritto, the follow-through layer, starting with fitness; and Deliberation, our research into how an AI can hold a problem and reconsider. We publish what we learn and ship what works.
Founder
Nik G
Senior iOS engineer with eleven years of shipping apps, including medical-device software. I lead the research and build the products, and make videos on tech, life and whatever I'm thinking about.
Also made here: SlotOwl, appointment alerts for US visa, Mexico INM and Schengen portals.