Σ · the sum of everything you know
Sig captures everything you feed it — meeting notes, sales calls, Slack threads, your honest read on what happened — and keeps it on your machine. Then ask across all of it: "You've seen my calls this week — what patterns are you noticing? What am I missing?"
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?
The core loop
Capture. End of day. Share.
Three actions, one loop: capture after a meeting, wrap up at the end of the day, share what your team needs to know. That loop builds your context, keeps your team's knowledge current, and compounds over time. Everything beyond that — 1:1 prep, weekly updates, custom reports — lives in the Skills tab.
Good morning, Jordan.
What do you want to do?
installed skills also appear here — run any workflow from one place
Team knowledge
Share once. Everyone's briefed.
One click in Sig sends a piece of knowledge to your team. Git handles the sync in the background — your teammate's Sig has it as context the moment they open it. No Confluence page. No Slack thread. No re-explaining.
Skills travel the same way.
Build a 1:1 prep skill, a weekly update template, a customer call debrief. Share it with your team in one click — they install it in seconds. The methodology travels without the training session. Git handles the rest; your team never sees it.
1:1 prep
from Adam · 34 installs
Installed
Weekly update
from Adam · 28 installs
Installed
Customer debrief
from Jordan · 12 installs
Install
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.
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
Four commitments, plain English
We don't have a security page written in the passive voice. We have four sentences a non-lawyer can hold in their head.
01
Your memory stays on your computer as plain markdown in the folder you pick. There is no Sig server holding your content.
02
When you send a message, your computer talks to your AI provider directly. We don't proxy, log, or intercept it.
03
Optional connections — Slack, team knowledge base, voice — only run when you turn them on, and you can disconnect anytime.
04
Sig sends a small set of anonymous events for crash diagnostics. Never your content, file paths, name, email, prompt text, or conversation text.
From early users
The moment it clicks usually happens in week two.
Sig is in early access. Here's what the first 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.
"
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.
"
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.
"
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.
"
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.
early users at 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