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Best Peptide Tracker App for UK Users in 2026

Updated September 14, 2026

Quick answer

Regimen is the most complete peptide tracker for UK users: injection logging, custom scheduling with cycles and dose titration, reconstitution calculators, half-life tracking, injection site rotation, supply tracking, side effects and 50+ daily markers, bloodwork, weight and health metrics, 200+ compounds, and pattern detection across all of it. Free for your first compound, on iPhone and Android. PeptIQ is the one to look at if you want an AI chat assistant and an interaction checker. PepTracker is the simplest dose log if you are on iPhone and running one compound. Pep AI has an in-app assistant and an active community, iPhone only. PepCalc is not a tracker at all, it is a one-time reconstitution calculator, and a good one.

At a Glance: Peptide Tracker Apps for UK Users

App Best For Platforms Scheduling Calculators Health metrics Injection sites Supply tracking Lab work Pattern detection
Regimen Understanding your whole health picture, not just your doses iOS, Android, web Any schedule, split week with per-day dose and time, cycles, titration 4, incl. reverse, oil-based, nasal Weight, body fat, resting HR, BP, glucose, sleep Advanced: custom spots, per-compound rotation, next site suggested Yes: vials, beyond-use dates, cost, reorder reminders Yes, 25+ markers scanned from your report Correlates your doses with your labs, check-ins and health metrics
PeptIQ AI chat and an interaction checker iOS, Android, web Daily, EOD, weekly, custom Broad set, per its site Apple Health, incl. sleep and workouts Basic Vial depletion and expiry Yes AI chat assistant
PepTracker The simplest iOS dose log iOS only Standard Forward only, no reverse mode Weight, body fat No No No No
Pep AI An in-app assistant and community iOS only Standard Yes Basic Basic No No No
PepCalc Reconstitution math only iOS only Not a tracker Reconstitution only No No No No No

Feature coverage verified against each app's App Store or Google Play listing and official site as of September 2026. Verify current details at the source before purchase.

Methodology

How We Evaluated These Apps

We compared every peptide tracker available to UK users against its own App Store or Google Play listing and official site. Disclosure: we make Regimen, so this is not an independent review. We name plainly where the other apps are better.

Protocol and cycle management

Can it hold every schedule you actually run: daily, specific days, every X days, a split week with its own dose and time per day, cycles with an end date, and a titration plan that moves you up on its own?

Reconstitution and dose math

Does it do the vial math where you log, and does it run in reverse, so you can pick the dose and the syringe and get the water to add?

Health metrics

Weight, body fat, resting heart rate, blood pressure, glucose and sleep alongside your doses, pulled in from Apple Health or Health Connect rather than typed.

How you're responding

How much of your response it can hold beyond the obvious, whether the list is long enough to fit you, and whether a note and a photo sit on the same timeline.

Injection site tracking

Whether it suggests the next site, lets you add your own spots, gives each compound its own rotation, and rests a spot while it heals.

Lab work

Whether you can get bloodwork in by scanning the report, and whether each marker sits on the same timeline as your doses.

Pattern detection

Whether it looks across your doses, metrics, labs and check-ins and tells you what is connected to what, or is just a logbook.

Supply tracking

Whether it knows what you have on hand, when it expires, and when to reorder.

Privacy and your data

No selling or sharing, a full export, account deletion, and import from a spreadsheet or another app.

The Apps Reviewed

1

Regimen

Regimen is built to show you what is actually working in a protocol, which in the UK usually means telling one supplier's batch from another.

Pricing

Free for your first compound, with no time limit and no card. Premium covers a full stack. iOS and Android.

Best for

Anyone running a stack, anyone on Android, and anyone who wants to compare two runs of the same protocol.

Strengths

  • + 200+ compounds and brands, covering the range UK suppliers actually ship: BPC-157, TB-500, GHK-Cu, AOD-9604, Selank, Semax, CJC-1295 and well beyond, plus custom compounds if yours is not listed.
  • + Every compound on its own schedule. Daily, specific days, every X days, a split week with its own dose and time per day, cycles with an end date, and titration plans. Run four at once without them colliding.
  • + Compare two runs of the same protocol. Same compound, same dose, eight weeks apart, with your response metrics overlaid. That comparison is the whole point in a market with no batch consistency requirement.
  • + Four calculators built in, including reverse reconstitution: pick your target dose and syringe, get the water to add.
  • + Injection site tracking that adapts. Custom spots, a separate rotation per compound, the next site suggested, and a spot rested while it heals.
  • + Bloodwork on the dose timeline. 25+ markers scanned straight from the report, plotted against what you were running.

Trade-offs

  • − Multi-compound tracking needs Premium. One compound is free indefinitely.
  • − No AI chatbot, by design. It is built around structured data and pattern detection instead.

Verdict: The only option here that handles a stack, runs on Android, and lets you compare one batch against another with your own data.

2

PeptIQ

PeptIQ is a peptide tracker for iPhone, Android and the web, built around an AI chat assistant and certificate-of-analysis scanning.

Pricing

Subscription, no free app tier per their own pricing page. iOS, Android and web.

Best for

Someone who wants an interaction checker inside the app they already log in.

Strengths

  • + Checks the compounds in your protocol against each other, which nothing else here lists as a feature.
  • + An AI chat assistant for questions about what you are running.
  • + Lab panel import and a provider-ready export.
  • + Runs on the web as well as both phones.

Trade-offs

  • − No free tier at all, so you cannot try the depth before paying.
  • − No reverse mode in the calculator.

Verdict: The interaction checker is a genuinely useful idea for UK buyers. Worth a look if a conversational interface suits you.

3

PepTracker

PepTracker is a clean, focused dose logger for iPhone.

Pricing

Free for a few protocols, paid tier beyond that. iOS only.

Best for

A first protocol, logged simply.

Strengths

  • + Fast to set up. Name a compound, set a schedule, start logging.
  • + A clear dose history and calendar view.

Trade-offs

  • − iPhone only, so Android users are out.
  • − Forward-only calculator, no reverse mode.
  • − No lab tracking and no correlation across compounds.

Verdict: Fine for one compound. Most people outgrow it once they add a second.

4

Pep AI

Pep AI is a peptide tracker for iPhone with a built-in assistant and community.

Pricing

Subscription. iOS only.

Best for

Someone new to peptides who wants questions answered next to their log.

Strengths

  • + An in-app assistant for protocol questions.
  • + An active community of people running similar protocols.

Trade-offs

  • − iPhone only. On Android in the UK, this is not an option.
  • − No lab work.

Verdict: The assistant is the draw. The tracking underneath is standard.

5

PepCalc

PepCalc is not a tracker. It is a reconstitution calculator, and the best dedicated one.

Pricing

One-time purchase in GBP. iOS only.

Best for

Getting the vial math right if you would rather not do it in your head.

Strengths

  • + Tells you how much bacteriostatic water to add, your resulting concentration, and the units to draw.
  • + One payment, no subscription.

Trade-offs

  • − Logs nothing. No doses, no response, no history.
  • − iPhone only.

Verdict: A good companion to a tracker, not a replacement for one. Regimen has the same math built in, so you would only buy this if you want a standalone tool.

Which one is right for you?

You are on Android

Regimen. Most peptide trackers are iPhone-only, which decides it before anything else.

You run more than one compound

Regimen. Each compound keeps its own schedule, cycle and rotation.

You want to compare two batches

Regimen. Overlay two runs of the same protocol and look at the response curves.

You want an interaction checker in the app

PeptIQ.

You are logging one compound on iPhone and want it simple

PepTracker.

You want the vial math and nothing else

PepCalc, alongside a tracker.

Get the app

Track your protocol in Regimen.

Free for your first compound. Dose reminders, reconstitution math, and your results in one place.

Download on the App Store Get it on Google Play
Regimen HRT tracker app dashboard

Frequently Asked Questions

Are peptide tracker apps legal to use in the UK?

Yes. Using a tracking app is legal regardless of what you are tracking. The legal question in the UK is about buying and possessing peptides, not about recording their use. Research chemicals are legal to buy in the UK as "not for human use" compounds.

Which peptide tracker apps work on Android in the UK?

Regimen is the fully featured option on Android. Most of the category is iPhone-only, including PepTracker, Pep AI and PepCalc. PeptIQ runs on Android and the web as well. If you are on Android, that narrows the list before you compare a single feature.

Can Regimen track peptide stacks with multiple compounds?

Yes. Each compound gets its own schedule, its own cycle, its own injection-site rotation and its own response curve. Most UK protocols involve at least two, BPC-157 with TB-500 being the common pair, so this is the normal case rather than an edge one. The free tier covers one compound.

How do I tell whether a bad run is the batch or my protocol?

Log the same compound, at the same dose, on the same schedule, twice. If the first run moved your response metrics and the second is flat, the protocol was not the variable. Regimen overlays the two runs so the comparison is visible rather than remembered, which is the only practical way to do this in a market with no batch consistency requirement.

Does Pep AI work on Android?

No, Pep AI is iPhone only. On Android in the UK your fully featured option is Regimen; PeptIQ also runs on Android and the web. PepTracker and PepCalc are iPhone only too.

How does Regimen help me identify batch quality issues?

By letting you compare two runs of the same protocol side by side. Log the same compound at the same dose on the same schedule, eight weeks apart, and Regimen overlays your response metrics from both. If the first run moved them and the second is flat, the protocol was not the variable.

Is PepCalc worth buying if I already have a tracker?

Only if you want a standalone calculator. It does the reconstitution math well and costs one payment, but it logs nothing. Regimen has the same math built in, including reverse mode, so most people do not need both. Regimen is a tracking tool, not a medical service. We do not provide medical advice. Always consult your healthcare professional before starting, changing, or stopping any medication protocol.

This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before starting any peptide protocol.