Regimen vs Shotlee: Which Injection Tracker Is Right for You? (2026)

Regimen and Shotlee both target the same user: someone running an injection-based protocol — whether that's a GLP-1 medication like Ozempic or Wegovy, a peptide stack like BPC-157 and TB-500, TRT, or some combination of all three. Both apps let you log doses, track medication levels, and set reminders. But they make very different bets about what you actually need from a tracker.

Here's an honest breakdown.

At a Glance

Regimen

Regimen is free for one compound with every feature unlocked — PK curves, injection site rotation, health metric correlation, reconstitution calculator, no credit card required. Premium ($4.99/month or $39.99/year) unlocks unlimited compounds for users running complex stacks.

The standout feature is health metric correlation. Regimen connects to Apple Health and Google Health Connect to pull in weight, body fat percentage, blood pressure, sleep quality, HRV, and resting heart rate — then maps those outcomes against your dosing timeline. If you want to know whether your GLP-1 is actually moving the scale, whether splitting your TRT dose stabilized your blood pressure, or whether your peptide stack is improving your sleep, Regimen shows you. That turns passive dose logging into something closer to personal clinical data.

The compound library covers 600+ compounds sourced from published pharmacokinetic studies and FDA prescribing information — GLP-1s, peptides, testosterone esters, HCG, aromatase inhibitors, and performance compounds. The half-life visualizer draws real PK curves showing how each compound's levels rise and fall between doses, which is especially useful for users managing multiple injection frequencies.

Beyond the app, Regimen operates a free web toolkit: 16 calculators including a TRT dose calculator, intranasal peptide calculator, peptide reconstitution calculator, split dose calculator, half-life visualizer, and more. These are accessible without downloading the app, and they drive the educational ecosystem that helps users understand their protocols before they ever log a dose.

Regimen runs on both iOS and Android and holds a 4.9-star rating.

Shotlee

Shotlee positions as a modern injection tracking app with AI-powered insights and clean UX. It covers GLP-1 medications, peptides, and TRT with dose logging, medication level predictions, vial management, and side effect tracking. The app emphasizes simplicity and AI-driven guidance as its core differentiators.

Shotlee also invests in educational website content — dedicated pages for different protocol types that are useful resources for anyone researching injection tracking options, regardless of which app they choose.

Where Shotlee has an edge: The AI-powered insight layer is a genuine differentiator if it delivers as advertised — getting intelligent recommendations within the context of your logged data is compelling. The UI is reported to be clean and modern.

Where Shotlee has gaps: No health metric correlation means the app logs what you do but can't show you what changes as a result. No free web calculators. Progress photos are absent. The Android situation is unconfirmed. Pricing is at a premium tier.

Pricing Comparison

Regimen's free tier is genuinely functional — you can track one compound with every feature including PK curves and health correlation, indefinitely. Premium is for multi-compound stacking.

Shotlee's pricing positions it at roughly twice Regimen's monthly cost. For users who are serious about protocol optimization and plan to track long-term, that difference compounds significantly over a year.

Who Should Choose Which

Bottom Line

Both apps are solid options for injection protocol tracking. The right choice depends on what you actually want from a tracker.

If your goal is to understand the impact of your protocol — to see whether your doses are producing the health outcomes you're aiming for — Regimen's health metric correlation is the feature that separates it from every other app in this category. Paired with PK curves, a 600+ compound library, and 16 free web calculators, it's built for users who take their protocols seriously.

If you want an AI assistant inside your tracker and you're running a simpler protocol on iOS, Shotlee is worth evaluating.

Try Regimen free — one compound, every feature

• PK curves, injection site rotation, health metric correlation
• 600+ compounds covering GLP-1s, peptides, TRT, and more
• Available on iPhone and Android

Get Regimen Free

Frequently Asked Questions