On-device metabolic intelligence
Your glucose,
minutes ahead.
Spectra forecasts where your glucose is headed — on your device, in real time — and shows it where you actually look: the Live Activity, Dynamic Island, and your wrist.
- Runs on-device
- Confidence you can read
- Not for treatment decisions
GLUCOCAST · ON-DEVICE
Steady near ~110 mg/dL · next 60 min
now+30 min+60 min
Built on the Abbott biowearable thesis — glucose today; ketones, lactate & alcohol next — and surfaced with the discipline of medical-grade mobile software.
See it run
The app, in motion.
A working iOS build, screen-recorded end to end — the GlucoCast forecast in a Live Activity, AI photo food-logging, an agentic coach, live fasting & workout tracking, and insights. No mockups.
A real ~2-minute screen recording — the GlucoCast cone & its Dynamic Island Live Activity, AI photo food-logging, the Abby coach, the live fasting timer & workout impact, and the insights dashboard.
The headline feature
GlucoCast forecasts the next 60 minutes — and renders it where a glance lands.
A continuous, on-device trajectory with an honest confidence cone. Not a single pre-meal score — a live picture of where you’re heading, on the lock screen, the Dynamic Island, and the Watch.
∿
A cone, not a false-precision line
The band widens with time and with your recent volatility. It never pretends to know the exact number — it shows a range you can actually trust.
104 →
→ 110
Glanceable everywhere
Live Activity, Dynamic Island, and the Apple Watch Smart Stack — surfaces Lingo and FreeStyle Libre don’t touch today. Zero taps to know what’s next.
⚠
Stale data fails safe
Past a 20-minute trust horizon the cone desaturates and the headline flips to “data may be out of date.” For a glucose app that’s a safety requirement, not polish.
One step beyond
Where Libre Assist points, GlucoCast goes further.
Same safety posture. Three axes further on the things a mobile org cares about.
Libre AssistSpectra · GlucoCast
Where it runsCloud, per requestOn-device, continuous, offline-capable
What it predictsPre-meal score (green/yellow/orange)60-min trajectory + confidence cone
Where it surfacesIn-app screenLive Activity · Dynamic Island · Watch
Honesty“Not for treatment decisions”Same — plus a stale-data safety state
A platform, not a feature
Glucose today.
Ketones, lactate, alcohol tomorrow.
The data layer is analyte-agnostic by construction. The same forecaster, the same cone, the same Live Activity render any biosignal with a one-line change — the multi-analyte future, built into the type system.
Glucose mg/dL
Ketones mmol/L
Lactate mmol/L
Alcohol g/dL
∿
G
K
L
A
The daily loop
A coach that acts. A fast that ticks. A meal you can photograph.
Abby — agentic coach. Reads your data freely; every write waits for a one-tap confirm.
Fasting — a live timer that counts up through Digesting → Ketosis → Autophagy.
Insights — time-in-range, variability, and a unified metabolic score.
The approach
Built the way medical-grade mobile software ships.
On-device inference
The forecast never leaves the phone. Private, instant, and it works with no signal.
Provable parity
The on-device Swift model is golden-vector tested against the server model — bit-for-bit, not “close enough.”
No black boxes
Every number traces to a documented formula, an authoritative database, or a logged model call.
Honest by default
Estimates ship with confidence and a confirm step. Stale data fails safe. We never claim live medical data when it’s simulated.
See where your metabolism is headed.
Spectra is a working iOS app — SwiftUI, on-device forecasting, a NestJS backend, and a Live Activity that runs today.
No spam. A showcase build, not a shipping product.