PeptideKit Alternative: Why Peptide Users Choose Regimen

Regimen vs PeptideKit: Two Peptide-Focused iOS Apps

Regimen and PeptideKit are both built for peptide users on iOS — but they solve different parts of the problem. PeptideKit is a therapy companion with progress tracking and an AI chat assistant. Regimen is a protocol tracker with AI label scanning and an immutable dose ledger.

What PeptideKit does well

PeptideKit positions itself as a "complete peptide therapy companion," and the feature set reflects that ambition. The app includes multi-metric progress tracking across seven categories: weight loss analytics, muscle growth, anti-aging metrics, hormone balance, injury recovery, energy and performance, and cognitive function. Each metric has its own tracking view with 7-day, 30-day, 90-day, and yearly analytics.

The comprehensive journal is a notable feature — you can associate journal entries with specific doses and log side effects alongside your protocol. For users who want to correlate how they feel with what they are taking, this is genuinely useful.

PeptideKit also includes a built-in AI chat assistant for peptide therapy questions. This is a different application of AI than what Regimen offers, and it serves a different need: education and guidance versus protocol extraction.

The scheduling system supports daily, weekly, bi-weekly, monthly, every X days, and custom intervals with an interactive color-coded calendar. Local notifications keep you on schedule. All data stays on-device — no cloud sync, no accounts, no data collection.

Pricing is flexible: a free base tier with Plus upgrades available weekly ($3.99), monthly ($9.99), yearly ($39.99–$49.99), or as a one-time lifetime purchase ($69.99). The lifetime option is unique in this market.

Where Regimen differs

Regimen's core assumption is different: you are running a structured protocol with specific cycling rules, and you need an auditable record of every dose.

AI label scanning is Regimen's signature feature. Photograph your provider's care plan or a vial label, and AI extracts the compound name, dose, frequency, and cycling schedule. This replaces manual data entry entirely for users whose providers give them written protocols.

The cycling tracker manages on and off weeks automatically — your protocol defines the cycle length and the app handles the rest, including pausing reminders during off weeks. PeptideKit's flexible scheduling handles varied intervals but does not appear to have dedicated cycling logic.

Injection site rotation with a human body diagram gives you a visual record of where you have injected and when. For users running multi-compound stacks who inject at different sites, this prevents doubling up and helps maintain tissue health.

The dose ledger is immutable. Every log is permanent. Corrections are handled by voiding the original entry and creating a new one. This creates a complete audit trail that you can share as a formatted PDF with your provider.

The honest comparison

PeptideKit has features Regimen does not: an AI chat assistant, a color-coded calendar, and a lifetime purchase option. These matter for users who want a "ask my app questions" experience or a one-time payment.

Regimen has features PeptideKit does not: AI label scanning from care plans and vials, dedicated cycling on/off schedules, injection site rotation with a body diagram, an immutable dose ledger, an Apple Health read-only sync that pairs sleep stages, weight, HRV, and glucose with your dose log, and a Tracked Outcomes system that anchors subjective ratings + Apple Health biometrics to each protocol with a 30-day sparkline, and vial inventory tracking that projects when an open vial runs out and alerts you when to reorder. These matter for users who need precision protocol management, want to know whether the protocol is actually working, and need doctor-ready documentation that includes outcomes alongside doses.

Side-effect logging is now table stakes in both apps. Regimen 1.17.1 added the Reactions Journal — a curated tag library across GI, mood, energy, sleep, sexual, cognitive, and injection-site categories, with severity, free-text notes, and 30-day backdating. PeptideKit's journal organizes the same kind of data slightly differently; the underlying capability is comparable.

Both are iOS-only. Both emphasize privacy. Both generate PDFs you can share with your doctor.

Which should you choose?

If you want an AI chat assistant for peptide questions, a color-coded calendar, or a one-time lifetime purchase — PeptideKit. If you want a focused protocol tracker that reads your care plan with AI, manages your cycles, anchors subjective ratings + Apple Health biometrics to each protocol so you can answer "is this working?", logs side effects with curated tags, and keeps a tamper-proof dose record you can hand to a doctor — Regimen. Different tools for different workflows.