Σ · the sum of everything you know

Let AI work with the sum of
everything you know.

Sig captures what never got written down — the meeting decisions, the verbal commitments, your read on what actually happened — and keeps it on your machine. Every AI tool you already use gets dramatically more useful because it finally has real context to work from.

Get early access See how it works →

macOS 13+ Windows soon works with Claude, ChatGPT, Copilot, Gemini

Bailey pushed the KB rollout to May 1. Told me in the hall — they're worried about the import path. I think it's fine but we should document the escape hatch.

Got it. I updated Bailey's file with the new date and the concern about imports, and filed the escape-hatch note under the KB project. Last time you met (Apr 10), Bailey raised the same import worry — this is the second time this month.

✓ Saved Bailey's file KB rollout This week

What did I say I'd do about it last time?

What you'll do Monday morning

Three things. Everything else is a skill.

Sig has three core actions: capture after a meeting, wrap up at the end of the day, and sync with your team. That loop builds your context and keeps your team's knowledge current. Everything beyond that — 1:1 prep, weekly updates, custom reports — lives in the Skills tab, where you choose what fits your workflow.

Sig — Home

⌘K

Good morning, Jordan.

What do you want to do?

installed skills also appear here — run any workflow from one place

Your files, your format

Your notes stay yours — forever.

Plain markdown files on your machine. Sig builds the context. Every AI tool you already use can read it. Leave tomorrow and your memory is still yours, in a format that's been readable for thirty years.

Plain files you can open in any app

Open them in Notes, Obsidian, or any text editor. Point any AI tool at them. The format has been readable for thirty years and always will be.

Private by default, shared by choice

Nothing leaves your machine until you review it and approve it. The personal layer — your thinking — stays yours, always.

Works with the AI you already have

Claude, ChatGPT, Copilot, Gemini, local models. Sig is the context layer under your AI tools — not another subscription to choose between.

How well Sig knows your work

Week 1

18%

Week 2

34%

Week 4

58%

Week 8

82%

Week 12

96%

By week twelve, your agents know your people, your projects, your patterns. Tribal knowledge no one else has captured — and every agent you run draws from it.

Gets sharper every week

Week 1 is decent.
Week 12 is yours alone.

The AI didn't change. The context did. Responses that used to be generic start being specific and grounded — and keep getting better.

The honest truth about week 1

Closing the mental loop. Two minutes after meetings, talking through what happened in Sig. It isn't a documentation chore — it's a way to empty your head so you don't carry the stress of "what did I forget." The payoff hits in week two, when your AI surfaces a verbal commitment you would have lost.

Privacy

Private by default. Always.

The best operators have always kept a private layer — the real read on what happened, not the official one. Sig is the first tool built to support that honestly, not to index it, summarize it, or ship it off.

What Sig isn't

Clarity about where we belong. Enterprise tools do enterprise jobs well — we fill the gaps they were never designed to reach.

→
Not a note-taking app. Notion and Obsidian ask you to impose structure. Sig asks you to talk about your work.
→
Not enterprise search. Glean and Copilot index what's already documented. Sig captures what never was.
→
Not a chatbot. ChatGPT starts from zero every session. Sig is what makes it start from everything.

Our promise

Three commitments, plain English

We don't have a security page written in the passive voice. We have three sentences a non-lawyer can hold in their head.

Everything you capture lands on your machine as plain markdown. No server copy by default.

Your personal layer — your thinking — is never synced, never trained on, never shared without your explicit approval.

When you do share, it's you reviewing the exact text with AI assistance, then clicking publish. That's the whole mechanism.

From early users

The moment it clicks usually happens in week two.

Sig is in early access. Here's what the first few hundred users have been telling us.

I manage a team of twelve. Before Sig, my 1:1s started with five minutes of figuring out where we left off. Now I ask what's open with each person before I walk in — last three conversations, open commitments, the thread I'd have otherwise lost. My team thinks I have an incredible memory. I don't. I have Sig.

Adam R.

Sr. Director of Engineering

I work across six client engagements at once. The context that falls between them — the offhand comment in a steering call, the thing the VP said after the meeting ended — that's where the real work lives. Sig is where I put it.

Marisa C.

Sr. Innovation Consultant

The moment it clicked was when I described a technical decision in standup and my AI already knew the constraints — because I had talked through it in Sig the week before. I stopped re-explaining my own codebase.

Morit T.

Senior Full Stack Developer

What sold me was seeing the markdown files. My context isn't locked to their app. If Sig disappears tomorrow, my memory is still mine — that matters more than any feature.

Devon K.

Principal Designer

We move fast and the relationships are everything. I used to lose the thread between conversations — what someone needed, what I had committed to. Now it's all there before the next call. That's the whole game in this business.

Andrew K.

Roc Nation Sports

early users at Universal Music Group Blindside GmbH Panora.cx Peninsula.co

Sig is coming soon.

Leave your email and we'll let you know when early access opens.

no account · uninstall leaves your files on disk