Regimen vs Pep AI: Which Peptide Tracker Is Right for You? (2026)

Pep AI has made a strong impression in the peptide tracking space with a polished interface, broad features, and a visible presence online. Regimen has been building a multi-compound protocol platform for users who want to connect their doses to their actual health outcomes. Both apps want to be your go-to peptide tracker, but they take different approaches to what that means in terms of features, price, and what you get before you pay anything.

Here's an honest comparison.

Quick Verdict

Choose Regimen if: You want to see what your protocol is actually doing to your body (weight, sleep, blood pressure, and resting heart rate tracked against your doses), you use Android, you want a lower monthly price, or you want meaningful free access before committing to a subscription.

Choose Pep AI if: You want an AI chatbot built into your tracker, community and shared protocols matter to you, and you're on iOS comfortable with the $9.99/month price point.

At a Glance

What You Get Before Paying

This is where the two apps diverge most sharply.

Regimen gives you one compound with every feature fully unlocked: vial tracking, injection scheduling, PK curves, injection site rotation, health metric correlation, bloodwork logging. Free, forever. No countdown, no trial, no credit card. If you're starting out with a single peptide protocol, you can run it in Regimen indefinitely at no cost. When your stack grows and you want to add more compounds, that's when premium ($4.99/month) comes in.

Pep AI gives you very little without a subscription. Based on hands-on testing, even adding a peptide to your protocol requires a paid plan. The Research Library of peptide information is accessible for free, but almost everything that makes a tracker actually useful (vial management, scheduling, dose logging) sits behind the $9.99/month paywall. Multiple App Store reviewers noted they couldn't use the core tracking features they downloaded the app for without subscribing.

This is worth knowing upfront, especially if you want to try an app before committing.

Regimen

Regimen is built around a core idea: tracking your protocol should tell you something about your health, not just create a log.

Health metric correlation is the feature that sets Regimen apart from every other tracker in this category. Regimen syncs with Apple Health and Google Health Connect to pull in weight, body fat percentage, blood pressure, sleep quality, and resting heart rate, then maps those outcomes against your dosing timeline. You can see whether your GLP-1 is moving the scale, whether your peptide stack is affecting your sleep, or whether a protocol change is showing up in your body composition. That context turns a dose log into something that actually tells you something.

The compound library covers 600+ compounds with pharmacokinetic data sourced from published clinical studies: GLP-1s, peptides, testosterone esters, HCG, SARMs, and performance compounds. The half-life visualizer draws real PK curves showing how levels rise and fall between doses, which matters when you're managing multiple injection frequencies.

Progress photos with side-by-side comparison and injection site rotation round out the core feature set. Bloodwork tracking is on the roadmap and coming in an upcoming release.

Beyond the app, Regimen operates 16 free web calculators: TRT dose calculator, intranasal peptide calculator, peptide reconstitution calculator, split dose calculator, half-life visualizer, GLP-1 dose calculator, and more. All accessible at helloregimen.com with no account needed. These tools are used by hundreds of thousands of people researching their protocols before they ever download anything.

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

Premium is $4.99/month or $39.99/year, unlocking unlimited compounds for multi-compound stacks.

Pep AI

Pep AI has built a feature-rich app with a clean interface that covers the core peptide tracking use case well, for users who pay for a subscription.

Pep Bot, the built-in AI assistant powered by Google Gemini, is the headline differentiator. Having an AI that can answer protocol questions within the context of your tracking app is a convenient feature. That said, because these are compounds you're injecting into your body, it's worth approaching any AI health guidance thoughtfully. Always verify protocol advice with a qualified professional, regardless of the source.

The community layer (anonymous posts, Verified Creator protocols, shareable progress cards) gives Pep AI a social dimension no other tracker in this space has built. If you're comfortable sharing your protocol publicly and want to see what others are running, this is a genuine differentiator.

The Research Library (75+ peptide profiles) and Pep Learn education system offer structured compound education within the app. This content is available on the free tier, though the information is generally available through other sources as well.

Vial management, scheduling, dose logging, bloodwork tracking, progress photos, and injection site rotation are all present, but all require a paid subscription.

Pep AI is iOS only. There is no Android app.

Pricing is $9.99/month or $44.99/year, roughly double Regimen's monthly price.

Pricing

At $4.99/month, Regimen is half the monthly cost of Pep AI. For users who are serious about tracking long-term, that difference adds up: roughly $60/year vs $120/year at monthly pricing.

The free tier difference is meaningful too. Regimen's free access is genuinely functional. You can run a single-compound protocol with every feature, indefinitely. Pep AI's free access is essentially the Research Library.

Platform Availability

Regimen is available on both iOS and Android. Pep AI is iOS only.

If you're on Android, Regimen is your only option between the two. If you share protocol tracking with training partners, Regimen covers both platforms.

Who Should Choose Which

Bottom Line

Both apps are solid options for peptide tracking, built by teams that are clearly paying attention to what users need.

The differences come down to philosophy and price. Pep AI bets on AI-driven guidance and community as its core value. Regimen bets on data depth (connecting your protocol to your actual health outcomes) and a lower price point that gives you more at every tier.

If you want to understand what your protocol is doing to your body, not just log that you took it, Regimen is built for that. Start with one compound for free and see for yourself.

Try Regimen free, one compound, every feature

• Health metric correlation: weight, sleep, BP, RHR mapped to your doses
• 600+ compounds covering peptides, GLP-1s, TRT, and more
• Available on iPhone and Android, half the price of Pep AI

Get Regimen Free

Frequently Asked Questions