Best Peptide Tracker Apps 2026: Regimen, Pep AI, PepTracker & More Compared

Why a Dedicated Peptide Tracker Matters

Peptides aren't like popping a daily vitamin. Each compound has its own schedule: BPC-157 might be twice daily, CJC-1295 a few times per week in the evening, and GHK-Cu on a completely different cadence. Some need to be cycled on and off. Some are morning-only. Some are split across two daily doses. When you're stacking three or four peptides, the scheduling complexity alone is enough to trip you up.

On top of that, you're reconstituting lyophilized powder, calculating concentrations based on vial size and BAC water volume, rotating injection sites, and tracking how you feel across weeks and months.

A phone alarm doesn't cut it. You need to know: what's my schedule for each compound this week? Which ones am I cycling off? What concentration did I mix this vial at? How many units is my dose in this syringe? Which glute did I pin last? That's the gap a good tracker fills.

The 8 Best Peptide Tracker Apps in 2026

We downloaded, tested, and compared every peptide tracking app we could find. Some are full trackers, some are calculators, and some are reference tools. Here's what each one actually does well, where it falls short, and who it's for.

1. Regimen

Regimen is a peptide tracker built for people running real protocols, not just logging a single compound. The app pulls from a library of 600+ compounds, and if you're only tracking one peptide (say, just BPC-157), it's free with full features.

The half-life visualizer is a standout that most peptide apps on this list don't have. It shows how compound levels rise and fall in your body over time using PK curves, which is genuinely useful for understanding cycling and dose timing. Injection site tracking with rotation suggestions keeps you from overusing the same spot. Correlation charts pull data from Apple Health or Health Connect to overlay dose changes against weight, sleep, blood pressure, and more.

The app includes a reconstitution calculator for getting your vial math right. The design is clean and gets you to what you need quickly.

What it does best: Managing complex peptide schedules with PK curves, injection site rotation, and health metric correlation. Clean design that makes daily tracking feel effortless.

Where it falls short: Newer app with a smaller review base. No built-in peptide reference library or wiki.

Best for: Anyone running a multi-peptide protocol who wants PK visualization and health data correlation in one place. Also the right fit if you track GLP-1s, TRT, or other compounds alongside peptides.

2. Pep AI — Best for Peptide-First Users Who Want AI Features

Pep AI has risen quickly to one of the top spots in the App Store for peptide tracking, and for good reason — it has an impressively broad feature set. The app covers vial inventory management, injection scheduling with a body map for site rotation, side effect logging, bloodwork tracking, sleep and hydration tracking, Apple Health sync, and a built-in AI chatbot called Pep Bot (powered by Google Gemini) that can answer protocol questions directly inside the app.

The community feature is a genuine differentiator — Pep AI has an anonymous user community with "Verified Creators" who share protocols, which adds a social layer most trackers lack.

What it does best: The most feature-complete peptide tracking app currently on the market. Pep Bot is a compelling in-app AI assistant for users who want quick protocol guidance without leaving the app. The Research Library (75+ peptide profiles with vial images) is well-built.

Where it falls short: Pep AI is iOS-only with no Android app. At $9.99/month it's the most expensive option in this category — double Regimen's $4.99/month price. Core features (including vial tracking, scheduling, and dose logging) all require a paid subscription. Based on hands-on testing, even adding a peptide to your protocol requires paying. The free tier is limited to the Research Library. Multiple App Store reviewers noted they couldn't use the main features they downloaded the app for without subscribing at $9.99/month. It also has no web presence beyond a single-page marketing site, meaning there are no free calculators, dosing guides, or educational resources outside the app itself.

Best for: iPhone users running peptide-only protocols who want an AI assistant and community features built in, and who don't mind paying a premium.

Not ideal for: TRT users (Regimen holds the #1 App Store ranking for "TRT tracker" — Pep AI is at #10), Android users, multi-compound protocol runners, or users who want free web calculators and guides alongside their tracker.

3. PepTracker: Dose Log

PepTracker has the largest user base of any peptide-specific tracker. 285 reviews is significant in this niche, and a 4.69 rating across that many users means most people are happy with it.

The app is protocol-focused. Set up your peptide, dose, and schedule, and it handles reminders and calendar views. The dose calculator covers basic reconstitution math. The free tier lets you track two protocols.

What it does best: Most established peptide tracker. Polished UX. Active development.

Where it falls short: iOS only. The free tier caps at two protocols. No multi-compound support beyond peptides. No half-life visualization or health metric correlation.

Best for: iOS users running one to two peptides who want the most battle-tested option.

4. PeptideKit

PeptideKit takes a different approach by combining protocol scheduling with journaling and analytics. The journaling system lets you log how you feel alongside your doses, and the analytics dashboard shows trends over time.

The "Commitment" calendar is a visual streak tracker that gamifies consistency. And the AI chat assistant lets you ask peptide questions directly inside the app.

What it does best: Journaling + analytics is a powerful combo for people who want to track outcomes, not just doses.

Where it falls short: iOS only. No dedicated calculators for reconstitution. No half-life visualization or PK curves.

Best for: iOS users who want to track how peptides make them feel over time, with journaling and analytics built into their tracking workflow.

5. PepPedia

PepPedia is the reference-first option. It's built around a peptide wiki and compound library, with tracking, inventory management, and lab features layered on top.

The built-in library is the standout. Half-life visualization and lab report scanning add genuine utility. Cross-platform support (iOS and Android) is a plus.

What it does best: Built-in peptide encyclopedia. Lab scanning. Cross-platform.

Where it falls short: Multiple reviews mention bugs. Notification reliability issues have been reported.

Best for: Users who want a peptide reference library and tracker in one app and are willing to tolerate some rough edges.

6. PepCalc

PepCalc is the highest-rated peptide tool on the App Store. It does one thing (reconstitution math) and does it extremely well.

Enter your peptide weight and BAC water volume, and it tells you exactly how many units to draw for your target dose. It supports multi-peptide blends and both U100 and U40 syringe types. The one-time $9.99 price means no subscription.

What it does best: Reconstitution math. Period. 931 reviews at 4.8 stars speaks for itself.

Where it falls short: It hasn't been updated since October 2023. No tracking, no reminders, no logging, no health data integration.

Best for: Anyone who just wants reliable reconstitution math without a subscription. Pairs well with a separate tracking app.

7. SHOTLOG

What it does best: Cross-platform availability. Nutrition and photo tracking alongside injections. Data export.

Where it falls short: The 2.7-star Android rating is a red flag. Ads in a health tracking app feel intrusive.

Best for: Hard to recommend with current ratings.

8. Peptide Library

What it does best: Free. Simple. Cross-platform. No commitment required.

Where it falls short: Very basic. No calculators, no advanced tracking, no health data integration.

Best for: Beginners who want a free starting point for basic peptide logging and reference.

Feature Comparison Table

How to Pick the Right App

Your protocol determines your app. Here's the straightforward breakdown.

What Peptide Users Actually Need From a Tracker — Insights From Regimen Data

Peptide protocols are fundamentally different from simple supplement routines, and tracking data from Regimen subscribers confirms what experienced users already know: the biggest challenge is not remembering a dose — it is managing cycles. Among Regimen subscribers, 58% report that tracking cycles is their number one pain point. This makes sense given the complexity of peptide scheduling: protocols like BPC-157 often run 5 days on / 2 days off, while longer cycles may follow 4 weeks on / 2 weeks off patterns. Across the platform, 13% of all active compounds have cycling configured, making cycle management a core feature requirement, not a niche add-on.

Peptide users also rarely run a single compound in isolation. Among Regimen subscribers, over 30% track two or more compounds simultaneously, with the average subscriber managing four active compounds at once. The data shows clear stacking patterns: BPC-157 paired with TB-500 is the most common peptide combination on the platform, reflecting the well-documented synergy between these two healing peptides. Any tracker that only handles one compound at a time fails the majority of engaged peptide users before they even finish setting up their first protocol.

Beyond healing peptides, longevity-focused compounds tend to cluster together in user protocols. Regimen data shows that subscribers tracking GHK-Cu, NAD+, and MOTS-c frequently run all three as part of a coordinated longevity protocol rather than as standalone compounds. This protocol-level complexity demands a tracker that understands compound relationships, not just individual dose reminders. Schedule diversity reinforces this point: while daily dosing is the most common schedule type at 32% of all protocols, peptide users rely heavily on flexible scheduling — 26% use specific-day schedules and 22% dose weekly — meaning rigid daily-only reminders leave most peptide protocols poorly supported.

Regimen was built around exactly these realities. It supports full cycling configuration, multi-compound protocol management, and flexible scheduling across daily, specific-day, weekly, and custom intervals — because peptide tracking requires all of them working together.

Track your peptide protocol in one app

• 600+ compounds with PK curves and injection site rotation
• Health metric correlation via Apple Health & Health Connect
• Free for one compound, no paywalls on features

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Frequently Asked Questions