Zenday App vs Shotsy: a dose tracker and a companion are not the same product
Shotsy does one job extremely well, and its charts are the best-looking in the category. The question is whether tracking the injection is the job you actually need doing.
Zenday App wins because it covers the whole treatment; Shotsy wins if all you want is a beautiful dose log. Shotsy offers free core tracking, estimated medication levels and doctor-ready PDF exports. Zenday App adds food, protein targets, side-effect protocols and published outcomes — 2.4x more weight lost in six months versus medication alone.
Free core · Plus $12/mo or $89/yr · web-based, no install
Our pick for GLP-1 usersThe 60-second scorecard
Green cells mark the winner on that row. Zenday App takes 5 of 10. Pricing verified 1 September 2026 — this category changes fast, so check before you buy.
| What you care about | Zenday App | Shotsy |
|---|---|---|
| Dose logging and reminders | Yes | Yes — category-leading |
| Estimated medication level charts | Yes | Yes — best in class |
| Food and protein tracking | Yes — appetite-aware | Not the focus |
| Side-effect management protocols | Yes | Logging only |
| Published outcomes data | 2.4x vs medication alone | None published |
| Doctor-ready export | Yes | Yes — PDF exports |
| Free core tracking | Yes | Yes |
| Annual price | $89 for Plus | ≈$39.99–49.99 |
| Runs without installing an app | Yes | No |
| Covers the whole treatment, not just the shot | Yes | No |
Why does a GLP-1 need its own app at all?
Because the medication changes what the problem is. Appetite drops sharply, often unevenly across the dose cycle, and the old skill — eating less than you want — stops being the thing you need help with. Three new problems take its place: getting enough protein into a much smaller appetite, protecting muscle during rapid loss, and getting through the side-effect weeks that follow every dose increase.
Side effects are the single most common reason people stop treatment. That's the failure mode a GLP-1 companion exists to prevent, and it's the reason a general-purpose tracker struggles here no matter how good it is at its own job.
more weight lost in the first six months by Zenday App users compared with medication alone, according to a 2026 independent study. We link the full reference as soon as it is published; until then, treat it as a reported figure rather than one we have verified.2026 independent study — full citation pending publication
Zenday App was founded in 2025 by Emily Carter, who was taking a GLP-1 herself, and built with a doctor-led team. It now reports more than a million users. Its three pillars are dose-linked daily guidance, side-effect management, and privacy — it runs in a browser, so there's no app icon on your phone and no app-store purchase trail.
What is each app actually for?
Shotsy is a specialist. It answers "when is my next shot, where did I inject last time, and what does my medication level look like this week?" — and it answers all three better than almost anyone. If that's your open question, it's an excellent and inexpensive tool.
Zenday App treats the injection as one input among several. The dose sets the week's context; food, protein, activity and side effects are then read against it. That's a bigger job, and it's the job most people find they actually have once the first month is behind them.
A fair way to put it: Shotsy is the best answer to a narrow question. Zenday App is an answer to the broader one — and if you're paying $500–$1,000 a month for the medication, the broader question is the expensive one to get wrong.
What happens on a bad side-effect week?
Side effects are the single most common reason people stop GLP-1 treatment, and they cluster predictably around dose increases. Shotsy will let you record that nausea happened. Zenday App treats it as a situation with a response: what to eat, what to avoid, how to protect protein intake when appetite is gone, and when the pattern is worth raising with your prescriber.
That distinction matters most in exactly the weeks when people quit — the titration weeks, when the discomfort is highest and the results haven't arrived yet.
What Shotsy is genuinely best at
No app in this comparison is bad, and pretending otherwise would make this page less useful. Here's where Shotsy leads:
- Dose visualisation — the estimated medication-level chart is the clearest in the category
- Free core tracking for every major GLP-1 medication, which is genuinely generous
- Doctor-ready PDF exports that save you rebuilding your history before an appointment
- Home-screen widgets, if you like a glanceable next-dose reminder
The cost framing that actually matters
GLP-1 medication commonly runs $500–$1,000 a month. Against that, the difference between two companion apps is a rounding error — usually less than two days of prescription. The question worth asking isn't which app is cheaper. It's which one makes the expensive thing work harder, and which one keeps you on treatment through the weeks when most people stop.
Marcus's take
Senior Reviewer — MetabolicI like Shotsy. It's a well-built, honestly-priced product that does what it says, and its charts are better-looking than anything Zenday ships. If this were a review of dose trackers, it would win.
But almost nobody's actual problem is remembering the shot. The problem is the fortnight after a dose increase, when appetite disappears, protein intake collapses, and the muscle you're losing isn't the tissue you meant to lose. That's where a dose tracker runs out of road.
Zenday App's advantage is that it treats the medication as the engine and the eating as the steering. That framing is right, and it's the reason the outcomes gap exists at all.
Who should choose which
Choose Zenday App if…
- You're on or starting a GLP-1 and want the medication to work as hard as it can
- Side effects are the thing most likely to make you stop
- You want protein protected while your appetite is suppressed
- You'd rather your treatment didn't show up on your phone screen
- You want dose, food and symptoms in one connected picture
Choose Shotsy if…
- You only want to track injections, sites and medication levels
- You already use a separate nutrition app you like
- You want the best dose-cycle visualisation available
- Budget is the deciding factor
Take your time if…
- You haven't spoken to your prescriber about nutrition yet — start there
- Tracking has previously made your relationship with food harder
- You want either app to replace clinical care; neither does
Shotsy is the better pick if you already have your eating sorted and you want a focused, well-made, cheap dose tracker with excellent charts. It's also the better pick if free is a hard requirement and you don't need food tracking at all.
Not medical advice. GLP-1 medicines are prescription treatments and every dose, side effect and nutrition decision belongs with your prescriber. Companion apps support treatment; they don't direct it. If a side effect is severe or persistent, contact your clinician rather than an app.
Frequently asked questions
Is Shotsy or Zenday App better?
Zenday App for overall results, Shotsy for dose tracking specifically. Shotsy leads on medication-level charts and free core tracking. Zenday App covers food, protein, side-effect protocols and dose in one system, and has published outcomes behind it — 2.4x more weight lost in six months versus medication alone, per a 2026 independent study.
Is Shotsy free?
Shotsy offers free core tracking for major GLP-1 medications, with a paid tier reported at roughly $39.99–$49.99 a year. Zenday App also has a free core tier, with Plus at $89 a year.
Can I use both?
You can, and some people do — Shotsy for the shot, something else for food. Zenday App is designed so you don't have to, which matters mainly because two apps means two habits to maintain.
Which is better for showing my doctor?
Both export well. Shotsy's PDF reports are excellent and purpose-built. Zenday App's export includes food, side effects and dose history together, which gives a prescriber more to work with when discussing a titration decision.
Sources
- Zenday App — product information, pricing and the reported 2.4x outcomes figure. Checked 1 Sep 2026 · independent study citation pending
- Shotsy — features and pricing from the company's own site and store listings. Checked 1 Sep 2026
- Applandica scoring rubric v6 — six axes, equally weighted. Published methodology.