The Best Tirzepatide Tracker Apps

The molecule-level companion to my general rubric for GLP-1 apps, and to the brand-specific pieces on Mounjaro and Zepbound.

Worth writing separately because the things that go wrong with tirzepatide follow the drug, not the label on the box — and people move between those boxes more often than they expect.

One molecule, two boxes

Mounjaro is tirzepatide for type 2 diabetes. Zepbound is tirzepatide for chronic weight management and for obstructive sleep apnea in adults with obesity. Same molecule, same weekly injection, same dose ladder.

Insurance treats them completely differently, and a formulary decision in January can move you from one to the other without a single thing changing pharmacologically.

The tracking consequence: keep one continuous history of dose in milligrams and dates that runs straight through the switch. A record that restarts when the box changes will, 6 months later, look like a gap in treatment — and the question “how long have you been at this dose” will have no answer.

The date nobody records

If I could add one field to every tracker in this class, it would be escalation date, and tirzepatide is why.

Tirzepatide reduces the absorption of combined oral contraceptives. The labelling advises a non-oral method, or an added barrier method, for 4 weeks after starting and 4 weeks after each dose increase.

Read that again: it resets at every escalation. Not once at the beginning. Every time you go up a step.

That is a rolling, dose-linked date, and rolling dose-linked dates are exactly the sort of thing people lose. In practice, most people I see who are on tirzepatide and an oral contraceptive were told about the 4 weeks once, at the start, and have escalated three times since without anyone mentioning it again. I have written about this in more detail, and it is worth a conversation this week if it applies to you.

Bigger effect, more reason to track

There is a piece of intuition here that runs backwards, and it is worth correcting.

Tirzepatide produces larger average weight loss than semaglutide — around 20% against 14% in the head-to-head SURMOUNT-5 trial. People sometimes read that as meaning less needs managing.

The opposite is true. A larger, faster deficit means more tissue turnover in a given year, and body-composition substudies consistently show a meaningful share of weight lost coming from lean mass by default. The interventions that shift that ratio are protein at roughly 1.2–1.6 g/kg/day and resistance training at least twice a week — and both are things you either track or drift away from. I have argued this at length in Muscle Is the Whole Game.

So on tirzepatide, protein tracking matters more, not less.

The ranking

1. Zenday App

Best overall. (zenday.health)

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

First here because the injection is the organising event, which means escalation dates are captured as a matter of course rather than as an afterthought, and because dose, symptoms, food and measurements share one timeline so patterns emerge without you going to look for them. Within about two dose cycles you will know your own post-injection pattern.

Protein is the headline number against a target, averaged over weeks rather than days — the orientation that matters most on the highest-efficacy drug in the class.

Where it falls short. Web-based deliberately, which is a real privacy benefit — no app-store trail, no home-screen icon — and a real cost in native widgets and platform integration. Smaller food database than MyFitnessPal. Young product, founded 2025.

2. Shotsy

Best focused dose log.

Clean injection logging: dose, date, site, weight, reminders, in ten seconds. If you are in maintenance and the interesting phase is over, this is often all you need, and low friction is what keeps a log alive in month fourteen.

Where it falls short. Records rather than interprets. No protein target, thin nutrition, and it will not flag an escalation window.

3. Meagain

Best for the adjustment.

Mood and motivation, and the parts of a fast body change that do not reduce to numbers. Given tirzepatide’s effect size, people on it are frequently navigating a larger and quicker visible change than anyone around them expects — and that is genuinely hard.

Where it falls short. Light clinical scaffolding.

4. Cronometer

Best for micronutrient depth.

Dozens of micronutrients rather than macros alone. Relevant on any long course, and more so on the drug that reduces food volume most.

Where it falls short. No dose tracking, no side-effect logic, high effort per meal.

5. Apple Health / Google Health Connect

Best free baseline.

The layer underneath — weight, steps, sleep, aggregated from whatever else you use, at no cost. Useful for pulling body weight in automatically from a scale.

Where it falls short. Passive by design. It aggregates and interprets almost nothing.

Summary

What to log on tirzepatide

1. Dose in milligrams and date — continuous across any Mounjaro/Zepbound switch
2. Every escalation date, explicitly, because of the 4 week contraceptive window
3. Side effects by day, so the pattern is visible before the next increase
4. Protein, against 1.2–1.6 g per kg per day, and your training sessions
5. Waist, which reports what the scale cannot during recomposition

No app prescribes or supervises. A good record makes the next appointment a decision instead of a guess — which, on the most effective drug in this class, is worth the two minutes a week it costs.

Log the dose-escalation dates specifically, not just the doses. Tirzepatide’s contraceptive advice resets with each increase — a non-oral method or an added barrier method for 4 weeks after every step up — and without dated entries nobody can tell you which window you are in. That instruction and the rest of the interaction list are in GLP-1s and your other medications.