From Excel spreadsheets to AI wellness platforms — we compared every meaningful option for tracking peptides and GLP-1s in 2026. Here's which ones actually give you peace of mind, and which ones just add confusion.
Managing a peptide or GLP-1 protocol used to mean one of two things: either you trusted your memory, or you built a spreadsheet and hoped you never accidentally deleted a formula. Neither option felt right for something that matters as much as what goes into your body.
In 2026, there are more options than ever. Apps, calculators, AI platforms, and custom spreadsheet templates have all tried to fill the gap. Most of them get something right. None of them — except one — were designed with the full picture in mind.
This guide covers every major tool in the category, what each one is actually built for, and where each one falls short. If you're trying to choose the right peptide routine tracker for your health journey, this is the only comparison you need.
Before diving into the comparison, it helps to define what good looks like. A peptide or GLP-1 tracking tool should do three things well, in this order:
Everything else — food tracking, sleep logs, water rings, AI coaches — is a feature that doesn't serve those three goals. Judge every tool in this list by how well it delivers on those basics.
Here's the full picture, at a glance. Detailed breakdowns follow below.
| Feature | Halflife — Peptide & GLP-1 Log | Shotsy | Pep AI | PepCalc | Excel |
|---|---|---|---|---|---|
| Easy Reconstitution | ✓ Built in — calculate BAC water, concentration, and draw volume inside the same app you track with | ✗ No | ✗ No | ✓ Yes — this is its only feature | Manual — if you build the formula yourself |
| Visual Level Tracker | ✓ Core feature — real-time decay curves show your active levels right now, not just your last injection date | ✗ No — injection diary only | Partial — dose log buried under lifestyle features | ✗ No — closes after calculation | ✗ No — static data entry only |
| Multiple Compound Support | ✓ Unlimited — all compounds tracked simultaneously with a combined active level view | ✗ Single compound | Limited — designed around one primary protocol | ✗ One at a time | Manual — you build every additional tab yourself |
| Low-Level Alerts | ✓ Automatic — trough alerts fire when your active levels approach a meaningful low, before you feel it | ✗ No | Generic reminders — not tied to actual compound levels | ✗ No | ✗ No |
| User Experience | Instant clarity — compound levels visible in 5 seconds; nothing to navigate past | Clean but narrow — simple diary UI, limited to its scope | Cluttered — dose tracking buried in wellness features | Functional — single-purpose web calculator, no persistence | High friction — requires setup, maintenance, and spreadsheet skill |
Numbers and checkboxes only tell part of the story. Here's what each tool is actually like to use — and who it's genuinely built for.
The original DIY solution. Infinitely customizable — in theory. In practice, a broken formula on dose day is the last thing anyone needs.
PepCalc solves one problem — how much BAC water to add, how many units to draw — and it solves it correctly. Then it's done. It doesn't know who you are. It doesn't remember what you calculated. It's a single-use tool.
Pep AI is ambitious. It combines peptide logging with meal tracking, water intake, sleep diaries, and AI wellness coaching. If you want all of that in one place, it delivers. The problem is that for most users, all of that gets in the way of the one thing they actually need to know: is my dose on track?
Shotsy is genuinely good at what it was designed for. If you're on a single weekly GLP-1 injection from a commercial pen — Ozempic, Wegovy, Mounjaro, Zepbound — and you want a clean diary to log it, Shotsy earns its rating. The issue is that most health journeys don't stay that simple for long.
Halflife — Peptide & GLP-1 Log does something none of the other tools on this list do: it takes the complex science of how your body actually processes a dose — the decay, the accumulation, the trough — and turns it into a visual dashboard anyone can understand in five seconds. No formulas to maintain. No features to navigate past. Just a clear picture of what's active in your system right now.
Every other tool on this list makes a trade-off that costs you something important.
Excel costs you time and stability. PepCalc costs you persistence — the calculation is gone the moment you close the tab. Pep AI costs you focus — your dose level is buried somewhere beneath your water ring. Shotsy costs you flexibility the moment your protocol grows past one compound or one schedule.
Halflife makes none of those trade-offs. It doesn't ask you to build anything. It doesn't ask you to navigate past anything. It doesn't guess at your dose level — it calculates it, in real time, based on the same pharmacokinetic principles that govern how every peptide behaves in your body. And then it shows you the result on a single, beautiful screen.
That's the question every peptide tracking app should be able to answer. Open Halflife — Peptide & GLP-1 Log and the answer is on the screen before you even finish unlocking your phone. Open any other tool on this list, and you'll spend those five seconds navigating, calculating, or remembering when you last logged something.
That five-second test isn't a gimmick. When you're in the middle of your day and you want to know whether it's time to inject, whether your levels are still holding, or whether the alert you just received means something — you need the answer immediately and you need it to be correct. Halflife — Peptide & GLP-1 Log is the only tool built around that standard.
If you want a quick, one-time reconstitution calculation and nothing else: PepCalc will give you that answer in 30 seconds. Use it for that purpose and don't expect more.
If you're on a single standard commercial GLP-1 pen and you want a clean injection diary to share with your doctor: Shotsy will serve you well — until your protocol changes.
If you want a full wellness super-app that happens to also log your doses alongside your meals and sleep: Pep AI exists for that use case. Understand going in that your dose tracking will share real estate with features that have nothing to do with your protocol.
If you're managing a peptide protocol — or a GLP-1 alongside anything else — and you want to actually understand what your body is doing between doses: Halflife — Peptide & GLP-1 Log is the only tool on this list that was built for that exact purpose. It's not the most feature-rich. It's the most useful. And in 2026, that distinction matters more than ever.
Real-time level curves, trough alerts, reconstitution math, and a clean calendar for every compound in your protocol. Nothing extra. Everything you need.
Download Halflife — Free on iOS ↗