How Alison thinks.
Three layers. One continuous loop. Built to do what no health app has done before.
SentNotes detects meaningful change in your personal baseline. It does not diagnose, prescribe, or replace clinical judgment. Every signal helps you route to a qualified human.
Health data is a graph problem.
Your signals don't exist in isolation — they're nodes in a living network, connected by relationships that only a graph database can traverse in real time. SentNotes runs on Memgraph, the in-memory graph database built for millisecond-latency relationship queries at scale.
In-Memory Speed
A pattern connecting your sleep, stress, and heart rate can span thousands of relationships. Memgraph traverses all of them in under a millisecond — so Alison detects what's changing before it becomes a problem.
MATCH (u:User)-[:HAS_SIGNAL]->(s:HRV)
WHERE s.trend < u.baseline * 0.72
RETURN u, s
Relationship-First
Your symptoms don't exist in isolation. Poor sleep connects to elevated HRV connects to skipped meals connects to a stressful week. Memgraph stores those connections — so Alison asks the right question: not what changed, but what it relates to.
RETURN x.type, x.value
ORDER BY correlation DESC
Streaming Ingestion
Every device reading, lab result, and mood log becomes a node in your health graph the instant it arrives. Nothing sits in a queue. Nothing waits for a batch process. Your graph is always current.
type: "HRV_DROP",
ts: timestamp()
})-[:TRIGGERED_BY]->(s)
| domain | type | correlation |
|---|---|---|
| sleep | deep_sleep_min | −0.89 |
| nutrition | carb_timing | −0.71 |
| mood | stress_score | +0.68 |
| labs | ferritin | +0.67 |
Correlation strengths — not causal diagnoses. These relationships surface patterns for human review.
Your health is not data.
It's a connected story.
Every signal connects to every other. Sleep to HRV. Stress to ferritin. Environment to mood. The knowledge graph is how Alison reads the whole story — not just the latest chapter.
The graph stores the relationships.
The loop acts on them.
Memgraph gives Alison a living network of connected health events. The OODA loop is how she traverses it — continuously, in real time, turning relationships into escalations.
The OODA Loop
Observe. Orient. Decide. Act.
The intelligence cycle running continuously inside SentNotes.
Everyone observes.
Only SentNotes completes the loop.
| Platform | Observe | Orient | Decide | Act |
|---|---|---|---|---|
| Apple Health | ✓ | ◑ | ✗ | ✗ |
| Whoop | ✓ | ✓ | ✗ | ✗ |
| Oura | ✓ | ✓ | ✗ | ✗ |
| Most health AI | ✓ | ◑ | ◑ | ✗ |
| SentNotes | ✓ | ✓ | ✓ | ✓ |
The real unlock in health AI isn't better data collection. It's what happens after.