The engine

Signals in. One living picture. Honest outputs.

This page is for the curious: what AXLE actually reads, what it builds from it, and the principles that keep the whole thing honest. No magic claimed. Just the mechanism.

01

Signals in

AXLE listens to the streams you connect, continuously and quietly. Your body: heart-rate variability, sleep, resting heart rate and workouts via Apple Health. Your training: every session you log or import, with sets, paces, loads, and personal records. Your life: calendar, travel, weather, and the equipment you actually have access to today.

HRV Sleep Resting HR Workout history Personal records Calendar & travel Weather Equipment
02

One living context

Every signal lands in a single, versioned picture of you. One context, not a pile of disconnected charts. It holds your baselines, your training load, your preferences and your history, and it is rebuilt the moment something meaningful changes: a hard run this morning, a red-eye tonight, a new PR.

Baselines are yours, not borrowed. AXLE learns what normal looks like for you, then reads every new signal against it.

population range your baseline 90 days ago today resting heart rate
Fig. E1 · Your normal, not the average
03

The day’s outputs

From that context, AXLE writes the day: a workout forged for the body you woke up with, a readiness read with its reasoning attached, a morning briefing in plain language, and, when it genuinely helps, a recommendation for something you’re about to run out of.

Nothing is pulled from a content library. Each output is generated against your context. That is why two users never see the same day.

04

The learning loop

Then AXLE watches what happens. Sessions you finish, sessions you skip, feedback you give, corrections you make: every one of them adjusts the picture. Tell it “never show me creatine again” and that becomes a standing rule, not a suggestion it forgets by Thursday.

The longer you use it, the more specifically it is yours.

Plan Train Observe Adjust the picture of you updated by every session
Fig. E2 · The learning loop
05

Honesty principles

Learning systems guess. AXLE’s rule is that a guess must be labeled as one. Confidence travels with every output, and when the data is thin the engine narrows its claims instead of widening its adjectives.

data gets thin here AXLE narrows its claims, and says so rich data thin data the guess, with its honest width
Fig. E3 · Uncertainty, surfaced
06

Privacy architecture

The engine only works because it sees a lot of you. The handling has to be worthy of that.

P-01

Encrypted at rest. Health metrics are stored with field-level encryption. Your biometrics are never a product we sell.

P-02

Per-field consent for AI. If you connect an external AI assistant to your AXLE data, you choose what it can see, field by field, revocable any time.

P-03

Commission-blind recommendations. The recommender cannot see whether a product pays us. Ranking is driven by your context, and any commission is disclosed.

“No bluffing, ever.”

An unsure engine that admits it beats a confident one that’s wrong.

Next

See what the engine builds.