Wegovy tracker: the shot is weekly, the week is not flat
Wegovy goes in once a week, and the seven days after it are not all the same. The shot you took on Sunday is still doing most of its work on Tuesday, and by Saturday the estimated level has come down. A tracker earns its place by showing you that shape.
Setva is on its way to the App Store. The curve calculator on this site is free today.
A Wegovy tracker logs each weekly semaglutide injection, the site you used and how you felt, then shows the estimated level in your body across the seven days between shots. Semaglutide has a published half-life of about 7 days, so the level never falls near zero between doses, which is why day 2 and day 6 can feel like different weeks.
Draw the Wegovy curve for free, right in your browser, no signup.
What Wegovy is and how the weekly dose works
Wegovy is semaglutide, a GLP-1 receptor agonist given as a once weekly injection. The FDA approved it in June 2021 for weight management, with later approvals for cardiovascular risk reduction and for MASH with moderate to advanced liver fibrosis.
The label carries weekly doses of 0.25, 0.5, 1, 1.7, 2.4 and 7.2 mg, the last one sold as Wegovy HD and approved only for adults taking it for weight reduction who have already tolerated 2.4 mg for at least 4 weeks. Wegovy also exists as a daily 25 mg tablet, so check which form your prescription is for.
The published elimination half-life of semaglutide is about 7 days. That one number explains most of what follows.
Why day 2 and day 6 do not feel the same
Half of a dose is still in you a week later, as the next one arrives. Semaglutide also takes time to absorb from the injection site, so nothing spikes when the needle comes out. The level climbs for a day or two, peaks, then eases down.
The week has a shape. Early days are the climb, the middle sits near the peak, the end is a descent from a level that never reset. Because doses overlap, the estimate keeps building over your first weeks on a new strength.
Quiet appetite on day 2 and food noise back on day 6 can be the same dose seen at two different points, not you doing something wrong. This is an educational estimate from published half-life data, not a measurement of your blood.
What a Wegovy tracker actually needs to do
Most apps in this category stop at a checkbox on a calendar. That says nothing about the week you are in.
- Log the weekly shot in two taps, from the phone, watch or lock screen
- Record the injection site and show the last one used, so rotation is not guesswork
- Show the estimated semaglutide level today and where it is heading
- Keep the full dose history, including the week the mg strength changed
- Capture how you feel in one tap, not a paragraph
- Show weight as a trend, not a verdict on one morning
Side effects, and the day of the cycle they land on
Nausea, fatigue, constipation, reflux and headache are the complaints people raise most around GLP-1 treatment. What a log adds is timing.
Tag how you feel each day and the pattern surfaces on its own. Some weeks show nothing. Other times it is plain: nausea clusters on day 2, the energy dip lands at the end of the week.
That is something concrete to bring to your prescriber. Setva shows the pattern and stops there. It never suggests changing, splitting or skipping a dose.
The reminder problem with a weekly shot
A weekly injection is easy to forget precisely because it is weekly. There is no daily groove to fall into.
The fix is not a wall of notifications. One time-sensitive reminder on the day of your shot, and one more later that day if you have not logged it. Nothing after that.
No streaks, no guilt, no red marks for the week you were traveling.
Your Wegovy log stays on your iPhone
Dose records, injection sites, symptoms and weight are health data. In Setva they live on your iPhone and in your own private iCloud. No account, no login, no server of ours holding your history.
So there is nothing for us to sell or leak. Change phones and iCloud brings your records back. Weight syncs with Apple Health only if you want it to.
How Setva tracks Wegovy
Setva is an iPhone app built around that week. The curve leads: your estimated semaglutide level now, the phase you are in, and the countdown to your next shot. Under it sits the plain reminder that this is an estimate, not a measurement of your blood.
Setva is not on the App Store yet. Join the waitlist and you will hear from us the day it launches, at 79.99 USD a year or 12.99 USD a week, with no trial. The curve calculator on this site is free today, needs no account and runs in your browser.
- The weekly shot logged in two taps, from the phone, a widget or the Watch
- Injection sites on a body map that remembers the last one used
- One tap symptom chips with an intensity, and the pattern by day of the cycle
- Weight on a 7 day moving average, with Apple Health
- One reminder on shot day, one nudge if you have not logged it, then nothing
Setva is coming to the App Store. Join the waitlist and you will hear from us once, the day it goes live.
Questions people ask
Does a Wegovy tracker measure the drug in my blood?
No. It is an educational estimate from the published half-life of semaglutide, about 7 days, and the doses you logged. Only a lab test measures your blood.
How long does Wegovy stay in your system?
With a half-life of about 7 days, roughly half of a dose is still there when the next one is due, so the estimate never hits zero while you dose weekly.
Can Setva track Wegovy tablets instead of the pen?
Yes. Setva handles weekly injections and daily oral GLP-1 medication, so a daily 25 mg tablet logs as a daily dose. Same molecule, different week.
Can I log the 7.2 mg dose?
Yes. The dose in mg is yours to set, including 0.25, 0.5, 1, 1.7, 2.4 and 7.2 mg. Note that the label approves 7.2 mg only for adults on it for weight reduction who have tolerated 2.4 mg for at least 4 weeks, and not for cardiovascular risk reduction or MASH. A change in strength keeps its own date in your history.
Do I need an account?
No. No sign up, no email, no password. Your history stays on your iPhone and in your private iCloud.
Can I download Setva today?
Not yet. Setva is on its way to the App Store, and the waitlist tells you the day it goes live. The calculator here is free.
What does Setva cost?
79.99 USD per year or 12.99 USD per week. No free trial and no ads. The web calculator stays free.
This is an educational estimate based on published half-life data, not a measurement of your blood. Never change your dose without your prescriber.