OptiPin vs Regimen

Privacy: on-device vs cloud-by-design

This is the deepest architectural difference between the two apps, and it's not a bug on either side - it's a choice. Regimen is built around a cloud account. That's what makes Android + iOS + iPad sync work, and it means your dose history survives a lost phone without you thinking about backups. The trade is custody: your protocol lives on their servers, and Regimen's App Store privacy label lists email, name, and device/user identifiers as collected and linked to your identity, with identifiers used for third-party advertising.

OptiPin takes the opposite bet. There is no account to create and no cloud database - your doses, labs, photos, and notes are stored on your iPhone, with an optional iCloud backup that you control. If you're logging a peptide stack or an anabolic run, you may reasonably not want that history sitting in anyone's cloud, tied to your email. For a GLP-1 user tracking semaglutide on prescription, this matters less; for most of the people reading this page, it's the first row of the table for a reason.

Forecasting: calibrated vs population-average curves

Both apps draw pharmacokinetic concentration curves, and Regimen's are good - its half-life visualizer covers 40+ compounds with daily, cumulative, and projected views, built on published half-life data. But that's the ceiling of an uncalibrated model: population-average parameters. Real testosterone levels on the same 150 mg/week protocol routinely differ person-to-person by 2× or more, driven by ester absorption, SHBG, body composition, and injection depth. An uncalibrated curve tells you the shape of your levels; it can't tell you the height.

OptiPin starts from the same ester-specific PK models, then recalibrates the curve against your actual lab results - each blood draw pulls the forecast toward your physiology, so the next prediction lands closer than the last. It also models downstream estradiol and DHT from your testosterone protocol, which is where side-effect management actually happens on a multi-compound run. We've documented exactly how this works - models, assumptions, and limitations - in our forecast methodology write-up. The honest caveat applies to both apps equally: these are visualization and education tools. Neither replaces bloodwork, and neither should drive a dosing decision - that's between you and your prescriber.

Multi-compound and anabolic depth

If you're running testosterone plus an AI, a GH peptide, and a healing blend, the question isn't "can the app log six compounds" - both can. It's what the app does with the combination. OptiPin ships 200+ compounds with one-tap blend expansion (GLOW, KLOW, Wolverine stack and more), 40+ mapped injection sites for rotation across that volume of pins, multi-vial inventory with low-stock and reorder alerts, and titration schedules with automatic stepped dose changes. OptiPin then reads across all of it - dosing × Apple Health × logged symptoms × bloodwork - and produces plain-language summaries of what's moving and what to ask your provider about.

Regimen is no slouch here: its 150+ library spans peptides, TRT, PCT ancillaries, and GLP-1s, its cycle management handles on/off protocols, and its Signals engine overlays dose changes on weight, heart-rate, blood-pressure, and sleep charts with 50+ daily check-in markers. The difference in kind is the analysis layer: Signals shows you correlation charts to interpret yourself; OptiPin writes the interpretation. And on the hormone side specifically, Regimen logs estradiol labs but doesn't model your E2 or DHT response - OptiPin does both.

Pricing: identical sticker, different mechanics

This one's easy to verify and surprisingly symmetric: both apps cost $4.99/month or $39.99/year, and both have a genuinely usable free tier - one medication on OptiPin, one compound on Regimen - plus a 14-day trial. So price won't decide this for you. The mechanical difference: OptiPin's 14-day full trial requires no card and no account - install, use everything, decide. Regimen's trial runs as a standard auto-renewing App Store / Play subscription. Since both free tiers are real, the cheapest honest advice is: install both, run your actual protocol in each for a week, and keep the one that fits.

What Regimen does better

Credit where due - these are real advantages, verified on their site in June 2026:

Android, and true cross-device sync. Regimen runs on iOS, Android (Google Play), iPad, and Apple Silicon Macs, with cloud sync across all of them. OptiPin is iPhone-only. If you're on Android or split your life across devices, Regimen isn't just the better fit - it's the only one of the two that works.

A bigger free web catalog. Regimen publishes an extensive set of free browser tools - reconstitution calculator with reverse mode, GLP-1 dose calculator, titration planner - plus a large blog, localized into several languages. OptiPin's free peptide calculator, half-life visualizer, and free testosterone calculator are catching up, but Regimen's catalog is broader today.

More in-app languages. Regimen advertises 18+ in-app languages; OptiPin currently ships four (English, German, Spanish, Portuguese). If neither list covers your language, Regimen's odds are better.

Niche extras. CSV import from other tracking apps, and a GLP-1 clinical-trial comparison that plots your weight trajectory against published trial averages for semaglutide, tirzepatide, and retatrutide - a genuinely clever feature if weight loss is your primary goal.

Frequently asked questions

Is OptiPin or Regimen more private?

OptiPin, by design: no account, data on your iPhone, optional user-controlled iCloud backup. Regimen is account-based with cloud sync - your data lives on its servers, and its App Store privacy label lists email, name, and device/user identifiers collected and linked to identity, with identifiers used for third-party advertising. Cloud sync is genuinely useful; the trade-off is custody of your dosing history.

Does Regimen run on Android?

Yes - iOS and Android (plus iPad and Apple Silicon Macs), with cloud sync across devices. OptiPin is iOS-only. If you're on Android, Regimen is the better choice; OptiPin simply doesn't run there.

Which app forecasts blood levels more accurately?

Both model PK concentration curves. The difference is calibration: Regimen plots estimated curves for 40+ compounds from population-average half-life data, while OptiPin recalibrates its ester-specific models against your own lab results and additionally models downstream estradiol and DHT. Neither replaces bloodwork - both are visualization tools, not clinical instruments. Full details in our forecast methodology.

Do OptiPin and Regimen cost the same?

Yes - identical sticker: $4.99/month or $39.99/year, each with a one-compound free tier and a 14-day trial. OptiPin's trial requires no card and no account; Regimen's runs as an auto-renewing App Store / Play subscription.

Is there a Regimen vs OptiPin comparison from Regimen?

Yes - Regimen publishes its own "Regimen vs OptiPin" page on helloregimen.com. We'd encourage you to read both. This page links to Regimen's website and both store listings (theirs, ours) so every claim can be verified at the source - and we say plainly where Regimen wins. You can also check what real users say in our App Store reviews.