# Naetha Human: a private atlas of the family's bodies and health

The health history of a whole family pinned to personal 3D models. On its own hardware, with no vendor account.

## At a glance

- Type: Kol.ski's own product
- For whom: Families, later also clinics
- Scope: Concept, server, web and iPhone applications, AI and 3D worker
- Status: Family version in daily use, concept 1.0

## Challenge

The history of a human body is scattered. A photo of a skin change sits in the camera roll with no record of where on the body it was taken. Test results live in laboratory portals, children's measurements in a health booklet, imaging in hospital systems that do not talk to each other.

> Since when, and has it changed?

The answer to that question from a doctor is usually a guess. And children's health data is the last thing anyone wants to hand to someone else's servers.

## Solution

Every person has their own 3D model, which is a map and an index of their history. A parent holds a finger on the child's model where the change is, takes a photo, saves. Three weeks later the camera shows the previous photo as a ghost to line up the frame, and at the appointment two dated shots sit side by side.

### The body as a map

A place on the model leads to the observations, photos, measurements and examinations of that place.

### Time as a dimension

Every record has the moment it happened and the moment it was recorded. The time machine overlays two versions of the body.

### Data stays with the family

The server, the files and the AI processing run on the family's hardware. The app works offline and syncs in the background.

### AI proposes, a human approves

AI organises and points out differences between photos. Every result is a draft for a human to approve.

## Result

| Number | Meaning |
| --- | --- |
| 93 | stable anatomical regions that survive a model replacement |
| 4 | model layers: skin, muscles, skeleton, organs |
| 0 | photos and data on someone else's servers |
| 1.0 | version of the product and platform concept |

### What works

- The family version in daily use by the founders.
- A body journal operated with one hand, a skin timeline, a time machine and a voice journal.
- The iPhone app works offline and uploads changes in the background.
- Every operation leaves an audit trail, and a whole person can be exported in an open format.

### Ahead

- Encryption at rest and the first real scan with a LiDAR phone.
- Import of medical imaging with a slice viewer.
- A clinic as an organisation with time-limited access to a slice of the history.

Naetha Human does not diagnose and does not replace a doctor.

## Architecture

Three parts, each of which can run on different hardware. None of them needs a vendor's cloud.

| Part | What it does | Technology |
| --- | --- | --- |
| Clients | A native iPhone and iPad application and a web client, with a local cache and an upload queue | SwiftUI, RealityKit, SceneKit, model-viewer |
| Organisation server | HTTP API and CLI on one logic layer, database, files, job queue, audit | Node.js, Fastify, PostgreSQL, OpenAPI, Cloudflare Access |
| AI and 3D worker | Processes photos and scans locally, builds model layers from open anatomy atlases | Python, Ollama, Blender, meshopt |

## Lessons

- Time needs two stamps. When something happened and when it was recorded: without both, the history lies with every late entry.
- An anchor on the body must not depend on the 3D mesh. Stable regions let us replace the model without losing the history.
- API and CLI on one logic layer. Everything the app does can be run from a script and tested without a browser.
- Children are not scaled-down adults. Fitting the model from measurements has separate rules for each age group.

## A similar problem?

We build private, local systems with AI that stay with the owner of the data. Tell us what you want to solve.

[Discuss your project](mailto:hi@kol.ski) · [Book 30 minutes](https://calendar.app.google/CJxZPq3FqabCDMS59) · [Projects](https://kol.ski/en/projects)