Preimage

Your glucose,
actively coached.

Connect your CGM through Apple Health. Preimage watches every reading in real time — flagging highs and lows, suggesting insulin doses, and proposing meals that fit your day.

Coming first to iOS. Needs an iPhone and a CGM that syncs to Apple Health.

Apple Health · CGM
Glucose 11.9 mmol/L ↑↑ — up 2.5 in the last 15 min
Fast rise after lunch. You have 0.5 U still active. Based on your correction factor and 7.0 target, here's a suggested correction — confirm before you take it.
→
Suggested dose
3.0 units
Correction 11.9 → 7.0 target 3.5 U
On board Insulin still active −0.5 U
Note You confirm every dose — the app never injects

How It Works

Three steps. Zero logins.

1

Connect Apple Health

Already wear a Dexcom, Libre, or other CGM? Link it through Apple Health in one tap. No accounts to hand over, no passwords stored anywhere.

2

Preimage watches every reading

New glucose lands every few minutes. Preimage reacts the moment it matters — a low, a high, or a fast swing — even while the app is closed.

3

Get proactive coaching

Insulin dose suggestions, meals sized to your day, and the patterns behind your numbers — surfaced before you have to ask.

Real-Time Monitoring

Every reading,
watched.

Preimage reads your CGM straight from Apple Health and wakes on each new sample — roughly every five minutes, around the clock. Cross a low, a high, or a rapid rise and it reacts immediately, so a bad number never sits unnoticed.

Glucose — 7 Day
MonTueWedThuFriSatSun
Avg 5.6 mmol/L Goal < 7.0
Alert Rapid rise — 11.9 mmol/L ↑↑ now

Insulin Dosing

Dose with
confidence.

Set the parameters your clinician gave you — carb ratio, correction factor, target, and a hard dose cap. When a meal or a high calls for insulin, Preimage computes a suggested dose, subtracts the insulin still working in your body, and shows you the full math. You confirm every dose; nothing is ever automatic.

Decision support, not medical advice. Always confirm doses with your healthcare provider.

Suggested dose — lunch
7.0 units
Meal 60 g carbs ÷ 1:10 6.0 U
Correction 8.4 → 7.0 target 1.0 U
On board No active insulin −0 U
Cap Under your 10 U max — tap to confirm

Calorie-Aware Meals

Meals that fit
your day.

Preimage tracks the calories you've burned from Apple Health — active and resting — and predicts your whole day. When it suggests a meal, it sizes the recipe to the budget you have left and keeps the carbs in line with your glucose goal. Concrete ingredients and steps, not vague advice.

Lemon-herb salmon bowl Lunch
480 kcal 12 g net carbs · 34 g protein
Fits ~620 kcal left in today's budget
Why this
Low-carb to hold your post-lunch curve
A 10-min walk after will flatten it further

Living Record

Your metabolic story,
always current.

Every reading, meal, dose, and lab result synthesizes into one evolving record — never lost in scroll. Preimage surfaces the patterns you'd miss: which dinners spike your fasting glucose, which days your numbers run smooth, what your last HbA1c was trending toward.

Metabolic Health Updated 4m ago
Patterns
Spike Evening carbs → +1.2 next-morning fasting
Smooth Post-dinner walks flatten the curve
Labs
HbA1c 6.1% — down from 6.6% in Feb
Fasting glucose averaging 5.6 mmol/L

Guardrails

Your targets,
never forgotten.

Your glucose goal, carb limits, and clinician-set dosing parameters are encoded as persistent invariants. Every suggestion — a meal, a dose, a nudge — is checked against them. A low is always treated with carbs, never insulin. Your max dose is never exceeded. The boundaries hold no matter how much history accumulates.

March 2026
Week 11
Week 12
Today
Goal: glucose < 7.0 mmol/L
Carb ratio 1:10 · max dose 10 U
Enforced on every suggestion

Everything for your glucose.
Nothing you don't.

Capabilities that work together, around the clock.

Glucose Alerts
Lows, highs, and rapid swings surfaced the instant they happen — even with the app closed, straight from your CGM.
Insulin Log & IOB
Every dose you confirm is logged and decayed over its duration — so suggestions account for what's still working and never stack.
Meal Cards
Concrete recipes with carbs, calories, and prep steps — sized to your remaining budget and your glucose goal.
Apple Health
Glucose, activity, and energy burned read on-device and read-only. The single source of truth — no third-party logins.
Timeline
Every reading, meal, dose, and lab in one chronological view. Star what matters and track how your numbers evolve.
Daily Digests
A morning summary of your glucose and what needs attention. Timezone-aware, urgency-scored, silent when all is well.
Lab & Photo Capture
Snap a lab report or a meal. AI reads it, extracts the numbers, and folds them into your record automatically.
Proactive Follow-Ups
"Recheck in 15 minutes after that low" — and it actually checks back with you, on time, every time.
Unlimited Memory
Months of readings and meals distilled into high-fidelity context — every detail preserved, every suggestion informed.

Coaching for the moments that matter.

Real situations — answered in your pocket, the moment they happen.

Morning high
Correction suggested
Woke up at 9.8 mmol/L.
Above your 7.0 target with no insulin on board. A correction of about 2 U would bring you back in range — tap to confirm if you want to take it.
Before a meal
Bolus that fits
About to eat ~60 g carbs for lunch.
At your 1:10 ratio that's 6 U, plus 1 U to correct your 8.4 — 7 U total. Pre-bolus about 15 minutes before you eat for a flatter curve.
Going low
Carbs, not insulin
Dropping fast — 3.8 and still falling.
That's a low. Treat with ~15 g of fast-acting carbs now — do not take insulin. I'll check back with you in 15 minutes.
Dinner time
Budget-aware
What should I have for dinner?
You've burned ~2,300 kcal today and eaten ~1,500. Here's a 480-kcal, 12 g-net-carb salmon bowl that fits your budget — and won't spike you like last Tuesday's pasta.

Your health data stays yours.

Apple Health read on-device, read-only
No third-party logins or scraping
No training on your data

Preimage provides decision support, not medical advice. Insulin suggestions are built from parameters you and your clinician set, and you confirm every dose. Always consult your healthcare provider about your treatment.

Take control of your glucose.

Join the waitlist. Be first to try it.

Coming first to iOS. Needs an iPhone and a CGM that syncs to Apple Health.