Regimen vs Pep AI
Both apps track peptide protocols and ask the same question: is this actually working? Pep AI answers with an in-app AI chat and a small set of check-in fields. Regimen answers with built-in pattern detection, a purpose-built engine that ties every dose to 50+ daily markers, your bloodwork, and your Apple Health and Google Health Connect data, then learns your patterns over time.
Quick Answer
For knowing whether a protocol is working, Regimen is the stronger pick. Its pattern detection connects your doses with 50+ daily markers, your bloodwork and your weight and health metrics. It learns your history instead of comparing you to a generic baseline. Pep AI leads with an in-app AI chat and meal scanning, with a smaller set of check-in fields. Regimen is cheaper month to month ($7.99 vs $9.99), and free for your first compound where Pep AI’s tracking is subscription-only.
What Regimen shows you that a chat assistant doesn’t
Most trackers stop at logging what you took. Regimen connects your whole protocol to 50+ daily markers, your manual bloodwork, and your Apple Health and Google Health Connect metrics, then surfaces whether a compound is improving your sleep, moving a biomarker, or driving a side effect you’d miss by hand. It is a purpose-built analytical engine, not a chatbot: it does the correlation and learns your history, so a new cycle is measured against your own baseline. Pep AI’s AI chat generates written answers on demand; Regimen does the math underneath them.
Feature Comparison
| Feature | Regimen | Pep AI |
|---|---|---|
| Monthly price | $7.99/mo | $9.99/mo |
| Compound library | 200+ compounds and brands | Peptide-focused catalog |
| Rating | 4.8 stars (742 ratings, App Store and Google Play) | 4.7 stars |
| Check-in markers | 50+ daily markers | ~3 core fields |
| Correlation engine | Built in, purpose-built | AI chat summaries |
| Bloodwork tracking | Manual entry with dose overlay | In-app logging |
| Apple Health | Yes | Yes |
| Google Health Connect | Yes | Apple Health (Health Connect unconfirmed) |
| PK curves / half-life | 150+ compounds | Limited |
| Free tier | 1 compound | None for tracking |
Feature coverage based on publicly available app descriptions as of May 2026. See each app’s App Store listing for current details.
Why Regimen wins for most users
It tells you what’s actually working. Most trackers log a dose and stop. Regimen connects your whole protocol to 50+ daily markers, your bloodwork, and your health metrics, then surfaces whether a compound is improving your sleep, moving a biomarker, or driving a side effect you’d miss by hand. Pep AI’s AI chat answers questions on demand; Regimen does the correlation in the background.
It learns you over time. A new cycle is measured against your own history, not a generic baseline.
More signal in, more insight out. 50+ daily markers vs Pep AI’s ~3 core fields, manual bloodwork with a biomarker overlay on your dose timeline, and a one-way pull from Apple Health and Google Health Connect (weight, body fat %, resting heart rate, sleep, blood pressure).
Google Health Connect support for Android health data (Pep AI syncs Apple Health only).
Price. Month to month, Regimen is $7.99 against Pep AI’s $9.99. The free tier is where they really differ: Regimen gives you one compound with no time limit and no card, where Pep AI’s tracking features are all behind the subscription.
Where Pep AI is strong
In-app AI chat. Pep AI’s headline feature is a built-in chat assistant for quick questions about compounds, dosing, and protocols. If your main wish is to ask a tracker questions in plain English, Pep AI delivers that out of the box. Regimen’s approach is the opposite: a purpose-built engine doing the correlation, not a chatbot writing summaries.
Meal scanning. Photo-based food logging is built in, useful if you want nutrition tracking alongside your protocol without a separate app.
Review volume. Pep AI has more total App Store ratings (636 vs Regimen’s 284). Regimen leads on star rating (4.8 vs 4.7) but Pep AI has been collecting ratings longer.
Why the community is choosing Regimen over Pep AI
In a May 2026 r/Biohacking thread asking “Consensus on best peptide app?”, Regimen drew more independent endorsements than any other app mentioned, including Pep AI. The top community comments are below.
Regimen is in its own league, outperforming every other app
u/Adventurous_Essay518 · r/Biohacking · May 2026
easiest and most organized option I’ve used so far
u/Alainrob- · r/Biohacking · May 2026
Game changer for me
u/Brave-One-8879 · r/Biohacking · May 2026
See the full r/Biohacking discussion →
Pricing Comparison
Regimen
$7.99/mo
Free tier: 1 compound, no time limit. Premium adds unlimited compounds.
Pep AI
$9.99/mo
No free tracking tier. Vial management, scheduling and dose logging are all behind the paywall.
Which app should you use?
Choose Regimen if you want to know what’s actually working in your protocol, you run multiple compounds, you care about Apple Health and Google Health Connect correlation, or you want a free tier for one compound with no time limit.
Consider Pep AI if your top priority is an in-app AI chat assistant, or if photo-based meal logging is a feature you actively want alongside peptide tracking.
Frequently Asked Questions
What's the main difference between Regimen and Pep AI?
Regimen runs purpose-built pattern detection that ties every dose to 50+ daily markers, your bloodwork, Apple Health, and Google Health Connect data, then learns your patterns over time. Pep AI leads with an in-app AI chat and meal scanning, with a smaller set of check-in fields. Monthly, Regimen is $7.99 against Pep AI's $9.99, and Regimen is free for your first compound where Pep AI's tracking features all require a subscription.
Is Regimen cheaper than Pep AI?
Month to month, yes: Regimen is $7.99 against Pep AI's $9.99. Pep AI runs several annual prices at once, so check the App Store for what you are actually offered. The bigger difference is the free tier: Regimen covers one compound with no time limit and no credit card, where Pep AI's tracking features all require a subscription.
Does Pep AI have a free tier?
Not for tracking. Vial management, scheduling and dose logging all require Pep AI's $9.99/month subscription. Regimen's free tier covers one compound with no time limit and no credit card.
Which app has better check-in tracking?
Regimen offers 50+ daily markers covering energy, sleep, recovery, appetite, mood, libido, side effects, and compound-specific signals, and the built-in pattern detection engine correlates them against your dose history, bloodwork, and Apple Health / Health Connect data. Pep AI focuses on roughly 3 core check-in fields and leans on its AI chat for analysis.
Can I import data from Pep AI to Regimen?
Not currently. There is no direct import between the two apps. If you're switching, you'll need to re-enter your active protocol manually. Regimen's onboarding takes about two minutes per compound.
Which app should I choose if I'm running multiple compounds?
Regimen. Multi-compound tracking is the core use case Regimen is built for: separate dose schedules, site rotation, and PK curves for each compound, plus built-in pattern detection correlation across the full stack. Pep AI is better suited if your main need is an AI chat assistant inside your tracker.
Is Pep AI free to use?
Pep AI has no free tracking tier: vial management, scheduling and dose logging all require a paid subscription ($9.99/month). Regimen is free for your first compound, with no subscription required.
How does Regimen's pricing compare to Pep AI?
Regimen is $7.99/month and free for your first compound. Pep AI is $9.99/month with no free tracking tier. Regimen is the cheaper month-to-month option. Verified September 2026; check each App Store listing for current pricing.
Does Pep AI have an Android app?
No. Pep AI is iOS only. Regimen is available on both iOS and Android.
What is Pep Bot?
Pep Bot is Pep AI's built-in AI assistant, powered by Google Gemini. It can answer peptide protocol questions within the app. As with any AI health guidance, especially for substances you're injecting, it's worth verifying information with a qualified professional.
Does Regimen have progress photos?
Yes. Both Regimen and Pep AI support progress photo tracking with side-by-side comparison.
What free tools does Regimen offer?
Regimen operates 16 free web calculators at helloregimen.com, including a peptide reconstitution calculator, TRT dose calculator, intranasal peptide calculator, GLP-1 dose calculator, half-life visualizer, split dose calculator, and more. All are free with no account required.
Get the app
Try Regimen Free
Free for one compound, no time limit; Premium if you track more than one. No credit card required.
Free to download. Free for your first compound.
