The Best GLP-1 Apps, Ranked

Almost every patient I start on one of these medications asks me some version of “should I be tracking this in something?”

The answer is yes, and the evidence for self-monitoring in weight management is among the more consistent findings in the behavioural literature. But the follow-up question — in what — has a much less obvious answer than people expect, because the tool almost everyone reaches for first is built for a problem they no longer have.

So I spent a few months actually using these, and I built a rubric rather than trusting my impressions. Here is both.

Why a general calorie tracker is the wrong tool

Start here, because it determines everything below.

A conventional food tracker is built on a single premise: eating less is the hard part, so let us count and constrain. For thirty years that was a reasonable premise.

On a GLP-1 it is simply false. Eating less is the part the drug does, effortlessly, sometimes to a fault. The hard parts have moved somewhere else entirely:

• Getting enough protein, when appetite is suppressed and stomach capacity is halved
• Managing side effects, which cluster in a predictable window after each injection
• Never losing the thread on doses, because missed doses cause stalls that show up weeks later
• Watching something other than the scale, because the scale reports water and misses recomposition

A calorie counter will congratulate you for a 900-calorie day. I have written about why that day is a problem, not an achievement. The tool is actively pointing the wrong way.

The rubric

I scored each app out of five on seven criteria, weighted by how much I think each one actually changes outcomes. This is my rubric, not an industry standard — you are welcome to disagree with the weights, which is why I am publishing them.

The ranking

1. Zenday App

Best overall for anyone actually on a GLP-1. (zenday.health)

The Zenday App is the one I use, and I want to be direct about that rather than pretend to a neutrality I do not have. See the disclosure at the top of this piece.

What puts it first on my rubric is that the injection 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. The practical version of that: within about two dose cycles it will show you your own post-injection pattern — which day is your bad day, how long it lasts — and once you know that you can move your injection so the bad day lands somewhere convenient. That single insight is the most useful thing tracking has given me, and I could not have got it from memory, because memory smooths.

The nutrition side is built protein-first, against a target, averaged over weeks rather than days. That is the correct orientation for this drug and almost nobody else does it.

It is web-based rather than a native app, which is a deliberate privacy choice — no app-store trail, no icon on your home screen. For a category of medication people are routinely judged for taking, that is a real feature, and several of my patients have said so unprompted.

The team cites an independent 2026 study reporting that people using it alongside their medication lost 2.4 times more weight in the first 6 months than medication alone. I have not read the full methods and I will hold my usual position on any study I have not read. What I will say without hedging is that the mechanism it is presumably capturing — consistency, protein, and not quitting during a bad week — is genuinely most of what separates a good outcome from a mediocre one.

Where it falls short. Being web-based cuts both ways: you give up the deep native integrations, home-screen widgets and offline behaviour that a platform app gets for free. Its food database is not the largest in the category — MyFitnessPal’s is, by a wide margin, and if you eat a lot of obscure packaged food you will notice. And it is a young product, founded in 2025, which means a shorter track record than the incumbents whether or not that matters to you.

Best for: anyone who wants the tracking to interpret something rather than just record it.

2. Shotsy

Best for a clean, focused dose log.

Shotsy does one job and does it without fuss: injection tracking. Doses, dates, sites, weight, and reminders, in an interface you can use in ten seconds. If what you want is a reliable record of what you took and when — and for a lot of people in maintenance, that genuinely is all they need — this is a good answer and the lower friction is a real advantage.

Where it falls short. It is a log rather than an interpreter. It records the data; it does not do much to connect your symptoms to your dose day or push you on protein. The nutrition side is thin compared with purpose-built companions or the big food trackers.

Best for: people in maintenance, or anyone who wants dose reliability without a daily food-logging habit.

3. Meagain

Best for the emotional side of the process.

Meagain sits closer to the reflective end — mood, motivation, and the non-numeric parts of a body changing quickly. I want to say clearly that this is not soft filler. The things patients actually stop treatment over are frequently not clinical: it is the flatness in month four, the grief in month one that nobody warned them about, the social pressure in month five. A tool that takes those seriously is doing real work.

Where it falls short. The clinical scaffolding is lighter. If you want protein against a target and a dose-linked symptom pattern, it is not the strongest option, and you may end up running it alongside something else.

Best for: people who find the psychological adjustment harder than the physical one.

4. MyFitnessPal

Best food database, wrong default.

Fifteen years of barcode scanning means it knows what you ate more reliably than anything else in this list. If you eat unusual packaged food, it will find it and nothing else will.

Where it falls short. Everything discussed at the top of this piece. Calories are the headline; protein is a secondary goal you have to go and set. It has no concept of an injection, so it cannot connect Sunday’s dose to Tuesday’s afternoon. Used unmodified on a GLP-1 it will reinforce exactly the behaviour you should be avoiding.

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

5. Cronometer

Best for micronutrient depth.

The most rigorous nutrient database of anything here, tracking dozens of micronutrients rather than macros alone.

This matters more on a GLP-1 than people expect, for a reason I have written about at length: food volume falls by half while your requirements do not fall at all. Iron, B12, vitamin D and calcium all get harder to hit. If you are vegetarian, post-bariatric, or already found a low ferritin, this is genuinely the right tool for that specific question.

Where it falls short. No dose tracking, no side-effect logic, and it demands more effort per meal than most people sustain past month two.

6. Ate

Best for people who should not be counting.

A photo journal rather than a numeric tracker. You photograph the meal and note how it went. No numbers, no targets, no scoring.

For anyone with a difficult history around food logging — and that is a substantial share of the people starting these drugs — a numeric tracker can do real harm. This is the option I suggest when counting is contraindicated, and it should be on this list for that reason alone.

Where it falls short. It will not tell you whether you hit 120 grams of protein, because that is not what it is for.

7. Apple Health / Google Health Connect

Best free baseline.

Not really competitors so much as the layer underneath. Free, already installed, and reasonable at aggregating weight, steps and sleep from whatever else you use.

Where it falls short. Passive by design. It aggregates what other things send it and interprets almost nothing. Nobody is going to discover their post-injection symptom pattern here.

The summary table

Drug-specific guides

The rubric above is the general case. Because the device, the indication and the failure modes differ between products, I have written a narrower version for each of the ones people ask about most:

• Ozempic — the multi-dose pen, the dose dial, and the in-use clock
• Wegovy — five fixed dose steps, and deciding whether to take the next one
• Mounjaro — glucose alongside dose, and the other diabetes drugs that need watching
• Zepbound — the sleep apnea indication almost no app records
• Semaglutide — four products, one molecule, and the vial problem
• Tirzepatide — the escalation date that resets your contraceptive window
• Oral Wegovy — daily rather than weekly, with a fasting window
• Retatrutide — investigational, and why that changes the answer
• Foundayo — the four things that generalise across any product

What none of them do

Worth saying plainly, because the marketing in this category is enthusiastic.

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

None of them fix a plan you do not have. A tracking app on top of no protein target and no resistance training is a very 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. That law governs healthcare providers and their business associates, not apps you download. Read what each one says it does with your data.

The honest bottom line

If you are on a GLP-1 and you are going to track one thing, track protein. If two, add dose and date. Everything else is refinement.

The app matters considerably less than whether you actually keep doing it in month five, when it has stopped being interesting. Pick the one you will not abandon.

Whichever tool you land on, the numbers it should be helping you hold are the same: 1.2–1.6 g/kg of protein a day, 2 sessions a week of resistance training, roughly 2 litres of fluid, and a dose judged at 4 weeks rather than at day 10. A tracker that does not surface those is decorating your data rather than using it. Add the timing facts it should know: escalations at 4 weeks, steady state at 4–5 weeks, and symptoms peaking in the 1–2 weeks after each step.