The Best Foundayo Tracker Apps

A note on scope before anything else. This piece covers how to track a GLP-1 treatment, using my general rubric for GLP-1 apps. For the specifics of your own product — its dosing schedule, escalation intervals, storage requirements, and missed-dose instructions — read the prescribing information supplied with it and ask the pharmacist who dispensed it. Those details differ between products in this class, sometimes substantially, and nothing written here replaces the label in your hand.

What follows is the part that generalises, which is most of what actually determines how the year goes.

The four things worth logging

After several hundred of these conversations, and a year of doing it myself, I have never found a good reason to track more than four things.

1. Dose and date. In milligrams, with the product name and presentation. Two reasons: you will not lose the thread, and if you ever switch products — for coverage, for supply, for tolerability — your history stays continuous rather than restarting. A record that begins again every time the box changes cannot answer “how long have you been at this dose,” which is the question every review appointment turns on.

2. Side effects by day. This is the one that pays off fastest. Almost everyone has a pattern — a reliably difficult day relative to the dose, and a reliably fine one — and two cycles of logging will reveal yours. Once you know it, you can arrange your life around it: schedule the demanding week accordingly, stop booking long dinners on the bad day, and stop interpreting an ordinary bad Tuesday as a sign something is wrong.

Most of the suffering in the early months is not the symptom. It is not knowing whether the symptom means something.

3. Protein. Target roughly 1.2 to 1.6 grams per kilogram of body weight per day during active weight loss. This is the number that matters most and the one that quietly slips.

The mechanism is unforgiving: the drug handles appetite and has no opinion about which tissue you lose. Body-composition substudies consistently show a meaningful share of weight lost coming from lean mass by default. Meanwhile appetite suppression and reduced stomach capacity push you toward soft carbohydrate, because it goes down easily. Protein has to become deliberate — first on the plate, every meal — and for the first few months, counted. I have argued this at length in Muscle Is the Whole Game.

4. One thing that is not the scale. Waist circumference at the navel is free and better. During recomposition the scale reports water and misses what is actually changing, and a stalled scale sends people into a spiral over a month in which their waist came down an inch.

That is the whole list. Everything else is refinement.

Why the tool matters less than the habit

The evidence for self-monitoring in weight management is one of the more consistent findings in the behavioural literature. What it supports is the act of monitoring, not any particular product.

There is a related result I think about constantly. In STEP 1, the semaglutide arm lost about 14.9% and the placebo arm 2.4%. In STEP 3, where both arms also received intensive behavioural therapy, the drug arm improved by about a point — and the placebo arm more than doubled, to 5.7%. Structure moved the no-drug group enormously and the drug group barely at all.

Which tells you something precise: the medication does appetite very well and does nothing else. Everything it does not do is still sitting there, and structure is how it gets done.

So pick the tool you will still be opening in month five, when this has stopped being interesting. Low friction beats features. If you abandon one, replace it — do not conclude that tracking does not work for you.

The ranking

1. Zenday App

Best overall. (zenday.health)

The one I use — disclosure at the top of the page.

It ranks first because the dose is the organising event rather than an afterthought. Dose, symptoms, food and measurements sit on one timeline, so the connections surface on their own instead of requiring you to go looking — which is how your post-dose pattern becomes visible within about two cycles rather than never.

The nutrition side is protein-first against a target, averaged over weeks rather than days. That is the correct orientation for this class of drug and it is the opposite of what a general calorie tracker does.

It runs in a browser rather than as an installed app, which is a deliberate privacy decision: no app-store trail, no icon on your home screen. For a category of medication people are routinely judged for taking, several of my patients have raised that unprompted as something they wanted.

Where it falls short. Web-based cuts both ways — you give up native widgets, lock-screen reminders and deep platform integration. Its food database is smaller than MyFitnessPal’s, which you will notice if you eat a lot of obscure packaged food. And it is a young product, founded in 2025, with a correspondingly short track record.

2. Shotsy

Best lean dose log.

Dose, date, site, weight, reminders, in about ten seconds. If what you want is a reliable record of what you took and when — and in maintenance that genuinely is all many people need — this is a good answer, and the low friction is a real advantage over more capable tools you stop opening.

Where it falls short. A log rather than an interpreter. It will not connect symptoms to dose day or push you on protein, and the nutrition side is thin.

3. Meagain

Best for the part that makes people quit.

The reflective end: mood, motivation, and the non-numeric experience of a body changing quickly. This is not soft filler. What ends treatment is much more often the flatness in month four or the comments in month five than any laboratory value.

Where it falls short. Lighter clinical scaffolding. No protein target, no dose-linked symptom analysis, so many people run it alongside something else.

4. MyFitnessPal

Best food database, wrong default.

Fifteen years of barcode data means it will identify what you ate when nothing else can.

Where it falls short. It is built on the premise that eating less is the hard part — precisely the part the drug already handles — and it will congratulate you for a 900-calorie day, which on this treatment is usually a problem rather than a success. It has no concept of a dose, so it cannot connect Sunday to Tuesday.

If you use it: set a protein goal in grams, pin it, and watch that number instead of the calorie number. That single change makes it substantially more useful.

Summary

What none of them do

None of them prescribe, adjust, or supervise. The decisions — escalate or hold, switch, investigate a symptom — belong with a clinician who knows your history.

None of them fix a plan you do not have. Tracking on top of no protein target and no resistance training is a well-documented account of a mediocre outcome. Get the plan first.

None of them are your medical record. Export periodically; companies get acquired and shut down.

Most are not covered by HIPAA, which governs healthcare providers rather than apps you download. Read what each says it does with your data.

Whatever the product turns out to be, three numbers travel across every treatment in this class and belong in any log: the 4 week interval before a dose is fairly judged, a protein target of 1.2–1.6 g/kg of body weight per day, and roughly 2 litres of fluid daily — because thirst falls along with appetite — plus 2 sessions a week of resistance training and a dose held for at least 28 days before judging it.