Personal data platform · in private development
Your life isn't
one app at a time.
Sigmastead is building a personal data platform that helps people bring selected information together, discover patterns across sources, set goals, and control what they choose to share.
Every app knows a sliver.
Nothing knows the shape.
Your health app knows how you slept. Your calendar knows what you did that week. Your bank knows what it cost. None of them can tell you how those things move together, because none of them can see past their own edges — and none of them are built to.
The question worth answering isn't inside any single service. It's in the relationships between them.
What we're building
Bring it together
Selected data from different parts of your life, in one place you choose — rather than scattered across the services that happen to hold it.
See across sources
Relationships that individual applications cannot reveal, because they can only see their own slice.
Say what matters
A Vision Board and goals, so the system knows what you are trying to improve rather than guessing at it.
Observations with sources
An AI assistant that produces observations you can trace back to the specific evidence behind them, not unattributed claims.
You choose disclosure
Control over which parts of your data or evidence you share, and with whom.
Minimized by design
The analysis path is designed so that raw records, calendar titles, attendees, locations and device names are stripped before anything is sent for analysis.
The intended shape
This is the architecture as designed. It is not a description of a deployed system — see where things actually stand below.
Where things actually stand
Most pre-launch sites describe the finished thing in the present tense. Here is the real state instead, because a company arguing for data honesty should probably start with its own.
- Ingestion
- A tested local prototype imports one Apple Health export and calendar files, and strips identifying fields at parse time. It is a one-time manual import, not a sync service. No production connectors exist.
- Analysis
- Designed against Amazon Bedrock with a structured response contract. No analysis request has successfully run. The usefulness of the assistant is unvalidated.
- Storage and keys
- Undecided. We are not claiming a private vault per user or user-held encryption keys, because neither has been designed to a standard we would defend.
- Export and deletion
- Designed, not built. We will not describe portability or erasure as available until they work.
- Compliance
- Nothing is audited or certified. No SOC 2, no ISO 27001, no attestation of any kind.
- Users and revenue
- None, and none.
Early, and talking to people.
If you work on personal data, cross-domain analysis, or privacy engineering — or you have a concrete problem here and would try something rough — that's the conversation we want.
Get in touch