Regimen vs Pep AI: Which Peptide Tracker Is Right for You?
Both apps track peptide protocols. Pep AI leads with a ChatGPT-style AI assistant and meal scanning inside the app. Regimen leads with multi-compound depth, 20+ check-in metrics, Apple Health and Health Connect correlation, and a free tier that unlocks every feature for one compound. Here's the full breakdown.
At a Glance
| Regimen | Pep AI | |
|---|---|---|
| Monthly price | $4.99 | $9.99 |
| Annual price | $39.99 | $44.99 |
| Compound library | 600+ | Smaller catalog |
| Check-in metrics | 20+ | Limited set |
| Built-in AI assistant | No | Yes (ChatGPT-style) |
| Apple Health / Health Connect | Yes | Limited |
| PK curves / half-life | Yes | Limited |
| Free tier | 1 compound, all features | Limited |
Where Regimen Wins
- Multi-compound depth: separate dose schedules, site rotation, and PK curves for every compound in your stack.
- 20+ check-in metrics covering energy, sleep, recovery, appetite, mood, and compound-specific markers.
- Free tier unlocks every feature for one compound. No trial, no credit card.
- Apple Health and Health Connect correlation links your dose logs to body composition, sleep, and weight.
- 600+ compound library covering peptides, GLP-1 medications, TRT protocols, and performance compounds.
Where Pep AI Wins
- Built-in AI Q&A: ChatGPT-style chat inside the tracker for quick questions about compounds and protocols.
- Meal scanning: photo-based food logging if you want nutrition tracking alongside your protocol.
If a built-in AI assistant is the feature you care about most, Pep AI delivers that out of the box. Regimen's strength is depth of tracking and correlation, not in-app chat.
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 $44.99/year
Free tier is limited. Most functionality lives behind the paywall.
Who Should Choose Which
Choose Regimen if you're running multiple compounds, you want PK curves and 20+ check-in metrics, you care about Apple Health or Health Connect correlation, or you want a free tier with every feature unlocked.
Choose Pep AI if your top priority is a ChatGPT-style AI assistant inside your tracker, or if photo-based meal logging is a feature you actively want.
Frequently Asked Questions
What's the main difference between Regimen and Pep AI?
Regimen is purpose-built for people running multiple compounds at once, with 20+ check-in metrics, PK curves, and Apple Health / Health Connect correlation. Pep AI's standout feature is ChatGPT-style Q&A and meal scanning inside the app. Regimen is $4.99/mo (or $39.99/yr); Pep AI is $9.99/mo (or $44.99/yr).
Is Regimen cheaper than Pep AI?
Yes. Regimen Premium is $4.99/month or $39.99/year. Pep AI is $9.99/month or $44.99/year. Regimen also has a free tier that tracks one compound with every feature unlocked, including the reconstitution calculator, PK curves, and Health Connect / Apple Health correlation.
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 20+ check-in metrics covering energy, sleep, recovery, appetite, mood, and compound-specific markers, then correlates those metrics against your dose history. Pep AI focuses on a smaller set of check-in fields and leans on AI Q&A 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 Apple Health and Health Connect correlation across the full stack. Pep AI is better suited if your main need is a ChatGPT-style AI assistant inside your tracker.
Try Regimen Free
One compound. Every feature unlocked. No credit card required.