A checkmark tells you that you injected. It says nothing about what's still working inside your body. For anyone running a GLP-1, peptide, or TRT routine, that gap is the whole problem.
Tracking a GLP-1, peptide, or TRT routine should feel empowering — not like homework that never quite adds up. If you've been using Regimen, you already know it's a beautifully designed app for building habits. But here's the problem: your weekly shot isn't a habit like drinking more water or going for a walk.
It's a dose that stays active in your body for days — fading gradually, shaping how you feel the entire time. Checking a box when you inject tells you nothing about what happens next. If you've been searching for a smarter Regimen app alternative that actually understands this, you're in the right place.
Regimen is excellent at what it was built to do: log your habits, build streaks, and keep you consistent. For supplements, hydration, sleep schedules, or workouts, it works beautifully. The problem starts the moment you use it for an injection-based health routine.
When you inject semaglutide, BPC-157, or testosterone, your body doesn't process that dose all at once. It fades slowly over hours or days — and that fade is different for every compound. Regimen has no way to know any of this. Here's what it sees:
It treats your GLP-1 shot the same way it treats "drink a glass of water" — as a box to check off, then forget. But your body doesn't forget. It's still working through that dose for days, and how much is still active directly affects how you feel, how you sleep, and how you perform throughout the week.
This is the fundamental gap between a health routine tracker and a body-aware tracking app. Regimen solves the first problem well. It wasn't designed to solve the second.
Halflife — Peptide & GLP-1 Log was built from the ground up for one specific job: showing you what's actually happening inside your body after every dose. Log what you took, when you took it, and the app handles the rest.
Here's what you get automatically — no manual math, no spreadsheets:
As the best peptide tracker app for people managing real health routines, Halflife gives you the picture your calendar and habit apps can't — the full week, not just injection day.
Here's something almost nobody talks about: the reason you feel amazing on day two and exhausted on day six is because your active dose is declining the entire time. It's not random. It's the predictable shape of every dose, every week.
Without visibility: You feel great Monday, notice a drift by Thursday, hit a wall by Saturday, and chalk it up to stress or sleep. You have no idea your active levels have fallen to under half their peak. With Halflife: You can see that dip coming on Wednesday. You know it's normal. You can plan around it — and work with your prescriber to smooth it out if it's affecting your quality of life.
Here's what each approach sees on a typical Day 5 of a weekly protocol:
That's the difference between a habit tracker and a body-aware tracker. One tells you what you did. The other tells you what's still happening.
Here's a direct, feature-by-feature look at how both apps approach your everyday health routine. This is specifically designed for people running a GLP-1, peptide, or TRT protocol who want to move beyond simple checklists.
| Feature / Benefit | Halflife Labs | Regimen App |
|---|---|---|
| Habit Checklists | ✓ Yes — plus a full visual timeline of what's active in your body after every log | ✓ Yes — clean, beautifully designed habit logging is what Regimen does best |
| Visual Dose Fading | ✓ Real-time active-level curve for every compound — watch your dose fade day by day | ✗ Not available — doses are tracked as one-time events, not active levels |
| Half-Life Math | ✓ Built-in and automatic — works for peptides, GLP-1s, TRT, and more from a full compound library | ✗ Not available — Regimen treats every habit the same regardless of compound |
| Avoids Energy Crashes | ✓ Flags your trough days in advance so you can plan — and have better conversations with your prescriber | ✗ No — without level tracking, the weekly dip arrives unannounced every time |
| Multiple Dose Stacking | ✓ See combined active levels across every compound in your routine in one unified view | ✗ Each habit is tracked separately — no cross-compound awareness |
Download Halflife — Peptide & GLP-1 Log on the App Store and take the guesswork out of your health routine. Log your first dose in seconds. Your active-level curve builds itself.
Download Free on the App Store →Medical Disclaimer. Halflife — Peptide & GLP-1 Log is a mathematical tracking tool that visualises compound activity levels based on documented fade rates. It is not a medical device and does not provide medical advice, diagnosis, or treatment of any kind. All dosing decisions, protocol changes, and health choices should be made in consultation with a qualified healthcare provider. Individual results and compound behaviour vary based on many personal factors.