Regimen vs PepTracker: Protocol vs Reminders

Reminder-First vs Protocol-First

PepTracker and Regimen approach peptide tracking from different angles. PepTracker is built around the reminder use case: it makes sure you don't miss a dose. Regimen is built around the protocol use case: it models your full cycling schedule, rotation plan, and dose history as a complete record.

Both start with logging doses. The differences show up when your protocols get more structured.

What PepTracker Does Well

PepTracker's tagline is "Never Miss a Peptide Dose Again" — the positioning tells you exactly what the app prioritizes. Their reminders are the primary feature, with a clean interface for setting injection times and getting notified.

Their syringe visual dose calculator is a distinctive UI element: you set the vial concentration and target dose, and the app shows you how far to draw the syringe. It's a visual representation of the math that makes the dose calculation intuitive for users who are new to peptide injections.

PepTracker also includes weight trend charts, which is useful for GLP-1 users who want to track weight alongside injections. The premium tier ($4.99/month or $47.99/year) includes cloud backup, data export, and offline access. The free tier supports 2 protocols and 5 templates, which is enough to evaluate the app before paying.

PepTracker supports both iOS and Android, which gives it broader platform reach than Regimen.

Where Regimen Goes Further

PepTracker is focused on reminders and basic dose logging. Regimen adds layers on top of that that matter for users running structured multi-compound protocols.

Cycling tracker

Peptide protocols commonly run on-cycle / off-cycle — 5 days on, 2 off; or 8 weeks on, 4 weeks off. Regimen's cycling system models these schedules exactly. Reminders pause automatically during off periods. The dose calendar shows which days are dose days and which are rest days. PepTracker's public site does not mention cycling support.

Injection site rotation with body diagram

Regimen uses a full anatomical front/back body diagram for injection site tracking. You tap the exact site for each injection — deltoid, quad, glutes, abdomen — and the app tracks rotation history. This matters for users managing multiple injection sites across multiple compounds. PepTracker does not advertise injection site rotation on their public site.

AI label scanning

Regimen can read a photo of your provider's protocol sheet or a vial label and extract the protocol automatically using AI. You don't have to manually enter compound names, doses, and schedules. PepTracker has no comparable feature.

Vial supply tracking with reorder alerts

Regimen tracks the vial you are drawing from. Log an open vial and how many doses it holds, and the app counts the supply down as you log doses, projects the date it will run out by walking your dose schedule forward, and raises a Low Supply alert a configurable number of days ahead — so you order a replacement before dose day, not after. PepTracker keeps you from missing a dose; Regimen also keeps you from running out of the compound.

Immutable dose ledger

Every dose log in Regimen is append-only with soft-void undo. Corrections create a voiding event rather than deleting the original record. You get a complete, defensible audit trail. PepTracker's architecture is not described in detail on their public site.

PDF report sharing

Regimen generates formatted dose history as a PDF for provider visits. The PDF now includes an Outcomes Since Starting section that pairs subjective ratings (mood, energy, libido, sleep, focus, joint pain, appetite) with objective Apple Health biometrics (weight, sleep stages, HRV, resting heart rate, glucose) per protocol. PepTracker's premium tier includes "data export and sharing tools" but does not specifically mention a doctor-ready PDF format with outcomes data.

Tracked Outcomes & Reactions Journal

Regimen 1.17 added a system for measuring whether a protocol is actually working. Tap "Rate today" on any protocol to score how you feel across the dimensions that compound is supposed to move. Apple Health fills in the objective metrics. Each outcome lives next to your dose history as a 30-day sparkline. The 1.17.1 Reactions Journal layers side-effect logging on top — curated tags across GI, mood, energy, sleep, sexual, cognitive, and injection-site categories, with severity and notes. PepTracker's public listing covers reminders and weight charts; outcome rating and a reactions journal are not advertised features.

Where PepTracker Has the Advantage

Price. PepTracker is less than half the cost of Regimen's monthly tier. If you need basic dose reminders and simple logging and your protocols don't involve cycling or injection rotation, PepTracker does the job at lower cost.

PepTracker's syringe visual is a polished UI element. Regimen now ships an equivalent. The Built-In Dose Planner is on iOS (inside protocol setup) and on the web at /calculators/dose-planner, so this is no longer a meaningful gap. PepTracker still has the edge on Android availability.

PepTracker has a dedicated standalone weight-loss chart for GLP-1 users. Regimen reads weight from Apple Health and shows it on Today plus a 30-day sparkline on every GLP-1 protocol via Tracked Outcomes — but the GLP-1 progress story isn't packaged as a single dedicated chart the way PepTracker presents it.

Android support. Regimen is iOS-only. PepTracker ships on both platforms.

Who Should Use Which

Choose PepTracker if: You want a straightforward dose reminder app at a lower price, you're new to peptide injection and want the syringe visual calculator, you want Android support, or you're tracking GLP-1 weight trends alongside injections.

Choose Regimen if: Your protocols involve on/off cycling, you want to rotate injection sites with a body diagram, you receive protocols from a provider as a care plan or PDF, you want AI to extract the protocol from a photo, or you need a formatted PDF for your doctor.