The methods behind every number in Steady.
Steady turns what you log into reminders, an estimated level curve and daily targets. Here is exactly how, where the numbers come from, and where an estimate stops.
The estimated medication level
After an injection, a GLP-1 is absorbed slowly from under the skin and cleared over days. Steady models this with a one-compartment pharmacokinetic model with first-order absorption, the standard textbook model for a drug like this.
For each medication it uses published average values: an elimination half-life (about 7 days for semaglutide, 5 for tirzepatide and dulaglutide, 13 hours for liraglutide), an absorption rate and a bioavailability. Each dose you log adds its own curve; the curves are summed to give the level now and the low point before your next dose.
This is a population average. It is not a blood test, it cannot know your own metabolism, and it never tells you to change a dose.
Your daily targets
Calories: resting energy from the Mifflin-St Jeor equation, multiplied by your activity level, minus a deficit only if your goal is below your current weight, and never below 1,200 kcal (women) or 1,500 kcal (men).
Protein: about 1.8 g per kg of your goal weight (or current weight, if lower), between 50 and 220 g and at most 40% of calories. Fiber scales with calories (20 to 45 g). Water is about 33 ml per kg of current weight (1.8 to 4.2 liters).
These are general targets from your own numbers, not a prescription. A dietitian or your doctor can set different ones.
Medication facts
Schedules, dose lists, missed-dose windows and side effects on this site come from each medication’s US prescribing information, linked on its page.
Your health data
We never sell your data. No measurement of you (weight, dose, shot dates) is sent to analytics, and you can ask us to delete what we hold at any time. The privacy notice has the full detail.
What Steady is
- A tracker for your GLP-1 doses, side effects, weight and daily targets
- A reminder on dose day, with the dose you were prescribed
- An estimate of your medication level, labelled as one
What Steady is not
- A medical device
- A way to choose, raise or change a dose
- A substitute for your prescriber or pharmacist
Questions
Is the level estimate accurate?
It is a population average from published pharmacokinetics. It shows the shape of your week, not a measurement of your body.
Which half-lives does Steady use?
About 7 days for semaglutide, 5 days for tirzepatide and dulaglutide, and 13 hours for liraglutide, from the labels and published studies.
Does Steady change my dose?
Never. It records the dose from your prescription and reminds you to take it.
Where do the medication facts come from?
From each medication’s US prescribing information, linked on its page.
How are my protein, fiber and water targets set?
From your weight, goal and activity, with the formulas on this page. They are general targets, not a prescription.
Who sees my health data?
We never sell it, and no measurement of you is sent to analytics. You can ask us to delete it at any time.
Is Steady a medical device?
No. It is a tracking and calculation tool.
Is Steady on iPhone and Android?
Yes. Steady is on the App Store for iPhone and on Google Play for Android.