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 Signals, 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.
Last updated: May 2026
What Regimen shows you that a chat assistant doesn't
Most trackers stop at logging what you took. Signals connects your whole protocol to 50+ daily check-in 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; Signals does the math underneath them.
Feature Comparison
| Feature | Regimen | Pep AI |
|---|---|---|
| Monthly price | $4.99/mo | $9.99/mo |
| Annual price | $39.99/yr | $39.99/yr |
| Compound library | 150+ compounds | Peptide-focused catalog |
| App Store rating | 4.9 stars (70+ reviews) | 4.7 stars (636 ratings) |
| Check-in markers | 50+ daily markers | ~3 core fields |
| Correlation engine | Signals (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, all features | Limited |
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
Signals tells you what's actually working. Most trackers log a dose and stop. Signals 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; Signals 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 check-in 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. Annual is a tie at $39.99/yr. On monthly, $4.99 vs $9.99 means Regimen is half the cost if you stay flexible.
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 70+). Regimen leads on star rating (4.9 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
Pricing Comparison
Regimen
$4.99/mo
or $39.99/year
Free tier: 1 compound, every feature unlocked. Premium adds unlimited compounds.
Pep AI
$9.99/mo
or $39.99/year
Free tier is limited. Most functionality lives 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 with every feature unlocked for one compound.
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 a purpose-built Signals engine that ties every dose to 50+ daily check-in 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. Both annual plans are $39.99/yr; monthly is $4.99 vs $9.99.
Is Regimen cheaper than Pep AI?
On annual, the two are tied: $39.99/year for both. On monthly, Regimen is $4.99 vs Pep AI's $9.99. Regimen also has a free tier that unlocks every feature for one compound, no trial or credit card required.
Does Pep AI have a free tier?
Pep AI's free experience is limited compared to Regimen's. Regimen's free tier unlocks every feature for one compound (no trial, no credit card). Pep AI gates more functionality behind its $9.99/month subscription.
Which app has better check-in tracking?
Regimen offers 50+ daily check-in markers covering energy, sleep, recovery, appetite, mood, libido, side effects, and compound-specific signals, and the Signals 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 Signals correlation across the full stack. Pep AI is better suited if your main need is an AI chat assistant inside your tracker.
Try Regimen Free
One compound. Every feature unlocked. No credit card required.