Peptide Library

App comparison • 2026

Peptide Library vs PepTracker: AI Protocols or Research and Vendor Comparison?

Protocol management, AI summaries, calendar sync and research tools compared, with where each app is ahead.

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Last verified · Published by Peptide Library, which has a commercial interest in this comparison. How we compare

Peptide Library app icon

Peptide Library

By Superfime LLC

A peptide research platform: cited research profiles, vendor and price comparison, tracking and inventory on iPhone, Android and the web.

PepTracker app icon

PepTracker

iPhone app (peptracker.app)

An iPhone protocol tracker with stacked and cycling schedules, calendar sync, two-way Apple Health and AI that builds protocols and summarises your week.

Quick verdict

Peptide Library or PepTracker?

PepTracker is an iPhone protocol manager: stacked and cycling protocols, due, upcoming and missed reminders, Apple and Google Calendar sync, two-way Apple Health, and AI (PepGuide and PepPulse) that builds a protocol from a sentence and sums up your week. Peptide Library goes further on research and buying, with cited profiles, publication data and vendor price comparison, and it also runs on Android and the web.

Peptide Library app icon

Peptide Library

Choose Peptide Library if…

  • You use Android or want a web app; PepTracker is on iPhone.
  • You want profiles that cite their studies, plus publication and trial statistics per peptide.
  • You compare vendor listings and price per mg.
  • You want progress photos and injection-site rotation, which PepTracker's listing doesn't mention.
PepTracker app icon

PepTracker

Choose PepTracker if…

  • You want AI to set up protocols and summarise your consistency, mood and energy.
  • You want reminders in Apple Calendar or Google Calendar.
  • You want weight, body fat and waist synced both ways with Apple Health.
  • You want stacked protocols with starter and advanced templates.

At a glance

Feature comparison: Peptide Library vs PepTracker

Every cell comes from a cited source; numbers link to the source list at the end of the page. "Not advertised" means no source we checked mentions the feature, not that the app lacks it.

  • Verified
  • Verified, with limits
  • Verified absent or removed
  • Not advertised by the developer
  • Not verified (sources disagree or unclear)
Research4 features
Research: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Compound library
200+ profiles7
Yes (no count published)14
Cited research references
Yes7

PubMed, ClinicalTrials.gov, DailyMed and EMA references on profiles.

Not advertised
Publication and trial data
Yes8

Research Intelligence Center: publication and trial statistics.

Not advertised
Community research trends
Yes (full view with Pro)91
Not advertised
Vendor discovery4 features
Vendor discovery: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Vendor directory
Yes10
Not advertised
Vendor price comparison
Yes11
Not advertised
Price per mg
Yes111
Not advertised
Vendor reviews
Yes10
Not advertised
Availability4 features
Availability: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
iPhone app
Yes3
Yes14
Android app
Yes4
Not advertised

The website shows a Google Play badge with no link.

Web app
Yes, installable5

Library, calculators and vendor prices need no account; tracking needs a free account.

Not advertised
Free plan
Yes (inventory: 1 peptide)1
Up to 3 protocols14
Inventory4 features
Inventory: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Vial inventory
Yes (free: 1 peptide)1
Supply tracking14

Doses and days left per vial.

Low-stock or run-out alerts
Yes4

Run-out and reorder dates with stock alerts.

Yes14

Refill reminder before you run out.

Expiry dates
Yes4
Not advertised
Stock deducted on logging
Yes4
Not advertised
Tracking2 features
Tracking: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Dose logging
Yes14
Yes14
History and calendar
Yes4
Yes14

Month and hour-by-hour week views; Premium for the full calendar.

Scheduling3 features
Scheduling: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Recurring schedules
Yes1
Yes14
Reminders
Yes16

App notifications; web push reminders on the website.

Yes14

Due, upcoming and missed-dose reminders; Apple and Google Calendar sync.

Cycles and titration
Yes4

On/off cycles, every-N-days, several times a day and titration.

Yes14

Cycling, every-other-day and every-X-days schedules; stacked protocols.

Calculations2 features
Calculations: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Reconstitution calculator
Android and web124
Removed from the app14

The release notes say the Calculator tab was removed to meet App Store guidelines; the website still links a web dose calculator.

Estimated level charts
No1

Profiles list half-lives; there is no modelled level chart.

Not advertised
Metrics and progress4 features
Metrics and progress: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Weight and body metrics
Yes1
Yes14

Weight, body fat, lean mass and six body measurements; some are Premium.

Progress photos
Yes (free: up to 2)1
Not advertised
Journal or symptom check-ins
Yes1

Journal check-ins with mood, energy, sleep and symptoms.

Yes14

Effects with each dose; mood and energy check-ins with Premium.

Injection-site rotation
In the apps, not on the web4
Not advertised
Nutrition and wellness1 feature
Nutrition and wellness: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Nutrition tracking
No1
Not advertised
Community1 feature
Community: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Community
Discussions free; Q&A with Pro131
Not advertised
Integrations4 features
Integrations: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Apple Health
Yes6

Reads weight and body fat; never writes.

Two-way sync (Premium)14
Health Connect (Android)
Yes6

Reads weight and body fat; never writes.

Not advertised
Wearables
No1

No Oura, WHOOP or Apple Watch app.

Not advertised
Home Screen widgets
iPhone only4

Home Screen and Lock Screen widgets ship in the iPhone app; Android has none yet.

Not advertised
AI1 feature
AI: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
AI assistant
No1

No AI in the app. A public, read-only MCP server lets AI assistants look up library profiles.

PepGuide and PepPulse (Premium)14
Data, sync and privacy3 features
Data, sync and privacy: Peptide Library compared with PepTracker
FeaturePeptide LibraryPepTracker
Multi-device sync
Pro (free Android accounts sync most data)1
Premium15
On-device storage
Yes46

The apps keep data on the device; account sync is optional.

Not advertised
Data export
Pro1
CSV (full history with Premium)14

Want research, vendor prices and tracking in one place? Peptide Library has a free plan.

Try Peptide Library freeExplore the research library

The difference

What makes Peptide Library different?

  • AI-assisted protocols, or none

    PepGuide builds protocols and reminders from a sentence or a photo of your plan, and PepPulse summarises your week; both are Premium. Peptide Library has no in-app AI.

  • Platforms

    PepTracker is an iPhone app; its website shows a Google Play badge with no link. Peptide Library has iPhone and Android apps and a web app.

  • Research and vendors

    PepTracker includes a peptide library without a published count. Peptide Library adds cited references, research statistics and vendor price comparison.

  • Progress tools

    PepTracker tracks weight, body fat, lean mass and six body measurements, with goals. Peptide Library tracks body metrics too and adds progress photos, journal check-ins and injection-site rotation.

These pieces work together: read a profile, compare vendors on price per mg, add what you bought to inventory, and every logged dose updates your stock, calendar and journal.

Research

Research library: a reference platform or a tracking companion?

PepTracker ships a built-in peptide library, and PepGuide answers general questions about peptides by text or photo. The listing doesn't describe research references or a profile count.

Peptide Library's 200+ profiles cite PubMed, ClinicalTrials.gov, DailyMed and EMA sources, with studies labelled by evidence type. Its Research Intelligence Center adds publication and trial statistics, and Compare puts two or three peptides side by side.

Browse the 200+ research profiles · See the Research Intelligence Center

Tracking

Tracking, scheduling and inventory workflows

PepTracker schedules daily, twice-daily, weekly, twice-weekly, monthly, cycling, every-other-day and every-X-days doses, runs several compounds in one stacked protocol, and keeps protocol history you can restore. Its calendar has month and hour-by-hour week views, and reminders can appear in Apple or Google Calendar.

Peptide Library's schedules cover every day, chosen weekdays, every N days, on/off cycles, several times a day and titration; past days keep the schedule they had when you edit one. Its calendar shows taken, missed and skipped doses by month or week.

For supplies, PepTracker shows doses and days left per vial with a refill reminder. Peptide Library deducts stock when you log and adds run-out and reorder-by dates and low-stock and expiry alerts.

Vendors

Vendor and pricing research

PepTracker doesn't advertise vendor listings or price comparison. Peptide Library's Shop compares vendor listings by compound and product form, shows price per mg after any coupon code, and links to vendor profiles with reviews.

  • Compare listings

    Offers grouped by compound and product form, never mixed across forms.

  • Price per mg

    Unit prices after any vendor coupon code, from what the listing shows.

  • Vendor profiles

    Reviews, coupons and the shipping details a source supports.

About vendor listings. Vendor listings, prices, reviews, coupon codes and commercial partnerships are not independent proof of a product's purity, safety, legitimacy or suitability for human use, and a listing is not an endorsement. Peptide Library does not sell peptides. Some vendor links are affiliate links; affiliate status never changes the order vendors appear in.

Compare vendor prices · Browse the vendor directory

Screens

Inside Peptide Library

Screens from Peptide Library on the web and in the app. We don't show PepTracker's screens; see its store listing for those.

  • Peptide Library body metrics on iPhone: weight, body fat, fat mass and lean mass with 90-day trends
    Body metrics with trends, next to your logs.
  • The Peptide Library calendar on iPhone with every scheduled entry this month logged
    A calendar of what was logged and what is next.
  • Peptide Library inventory on iPhone with low-stock and reorder alerts and run-out dates
    Inventory with uses left, run-out dates and reorder alerts.
  • Peptide Library tracker on iPhone with today’s scheduled entries and a 31-day streak
    Schedules, reminders and a daily log with streaks.

Pricing

Pricing: Peptide Library vs PepTracker

PepTracker's free plan covers up to 3 protocols, logging, reminders, supply tracking, calendar sync, the library and 30 days of weight history (its website says 2 protocols). The App Store lists Premium at $7.99 a month, $47.99 a year and $79.99 to $99.00 for lifetime, with a 7-day trial on the annual plan. Peptide Library Pro is $4.99 a month, $39.99 a year or $89.99 once.

Pricing in US dollars, checked October 25, 2026
PlanPeptide LibraryPepTracker
Free accessFree1

Library, vendor prices, logging, schedules, journal and metrics are free. Inventory is limited to 1 peptide.

Free14

Up to 3 protocols, logging, reminders, supply tracking, calendar sync, the library and 30 days of weight history (listing; the website says 2 protocols).

Monthly$4.9921$7.9914

The website shows $4.99/month as a discounted price.

Annual$39.9921$47.9914
Lifetime$89.9921$79.99–$99.0014
Free trialNot stated7-day free trial with the annual plan
ModelFree plan; Pro subscription or lifetime purchaseFree plan; Premium subscription or lifetime
  • US prices, checked October 25, 2026. Store prices vary by country and change; the price shown in each app before purchase is the one that applies. Check official pricing before you subscribe.
  • Peptide Library: US prices. App Store and Google Play prices are set per country and shown in the app before purchase.
  • PepTracker: Small, Standard and Power User purchases ($2.99–$14.99) are also listed; the listing mentions optional AI top-ups.

Fair is fair

Where PepTracker wins

  • AI that builds and reviews protocols

    Describe a protocol in one message, ask about your own logs, and get a weekly recap of consistency, mood and energy.

  • Calendar sync

    Doses appear in Apple Calendar or Google Calendar, alongside the rest of your day.

  • Two-way Apple Health

    Weight, body fat and waist sync both ways. Peptide Library reads weight and body fat and never writes.

  • Templates and stacks

    Starter and advanced protocol templates, with several compounds in one stacked protocol.

Who it suits

Who should use which app?

  • You want AI to manage your protocol

    PepTracker

    PepGuide and PepPulse are built for it.

  • You use Android or a laptop browser

    Peptide Library

    One account across Android, iPhone and the browser.

  • You live in your calendar

    PepTracker

    Apple and Google Calendar sync.

  • You research compounds and compare vendors

    Peptide Library

    Cited profiles, research data and vendor prices.

  • You track progress with photos

    Peptide Library

    Progress photos with side-by-side compare and a guided camera.

Final verdict

The verdict on Peptide Library vs PepTracker

PepTracker is a strong protocol manager for iPhone users who like AI help and calendar integration. Peptide Library is the better choice when you need Android or the web, or when research and vendor comparison sit alongside your tracking.

Both offer a free tier and a lifetime purchase, so you can try each before committing.

Get the Peptide Library app, or start on the web without an account.

Try Peptide Library freeBrowse vendor prices

FAQ

PepTracker vs Peptide Library: common questions

Does PepTracker have a calculator?

Not in the app any more. Its release notes say the Calculator tab was removed to meet App Store guidelines, and the listing says it doesn't calculate doses. Its website still links a web dose calculator. Peptide Library's calculator is on Android and the web.

Is PepTracker available on Android?

Not as of October 2026: its website shows a Google Play badge with no link, and we found no Play listing. Peptide Library is on iPhone, Android and the web.

How much is PepTracker Premium?

The App Store lists $7.99 a month, $47.99 a year, and $79.99 to $99.00 for lifetime, with a 7-day trial on the annual plan (US, checked October 2026). Its website shows $4.99 a month as a discounted price.

What are PepGuide and PepPulse?

PepTracker's Premium AI features. PepGuide builds protocols and answers questions about your logs; PepPulse summarises consistency, mood and energy trends, with Apple Health vitals.

Does PepTracker compare vendor prices?

Not according to its listing or website. Peptide Library's Shop compares vendor listings and price per mg within each product form.

Which app works with Apple Health?

Both. PepTracker syncs weight, body fat and waist both ways with Premium. Peptide Library reads weight and body fat from Apple Health or Health Connect and never writes to them.

Explore More Than Peptide Tracking

Research peptides, organize your tracking, manage inventory, and compare vendors in one place.

Get Peptide Library for iOSGet Peptide Library for AndroidExplore Peptide Library on the Web

Free plan available. Pro adds unlimited inventory, sync on every device, export and more; see Free vs Pro.

Peptide Library app icon

Peptide Library

By Superfime LLC

PepTracker app icon

PepTracker

iPhone app (peptracker.app)

PepTracker: Peptide Tracker is developed by Jayven Alan Villagomez Peredo (peptracker.app).

Sources

Store listings and developer websites as read on the date shown. Competitor details can change after that date.

  1. 1.Peptide Library Free vs Pro (Peptide Library, read )
  2. 2.Peptide Library pricing (Peptide Library, read )
  3. 3.Peptide Library and Tracker on the App Store (Apple App Store, read )
  4. 4.Peptide Library and Tracker on Google Play (Google Play, read )
  5. 5.Install the Peptide Library web app (Peptide Library, read )
  6. 6.Peptide Library privacy policy (Peptide Library, read )
  7. 7.Peptide Library research profiles (Peptide Library, read )
  8. 8.Research Intelligence Center (Peptide Library, read )
  9. 9.Peptide Trends (Peptide Library, read )
  10. 10.Peptide vendor directory (Peptide Library, read )
  11. 11.Compare peptide prices and vendors (Peptide Library, read )
  12. 12.Peptide calculator (Peptide Library, read )
  13. 13.Peptide Library community discussions (Peptide Library, read )
  14. 14.PepTracker: Peptide Tracker on the App Store (Apple App Store, read )
  15. 15.peptracker.app (PepTracker, read )

Disclosure and method

Peptide Library publishes this comparison and has a commercial interest in helping you evaluate its platform. Competitor features and pricing are reviewed using publicly available information: App Store and Google Play listings and each developer's own website, read on . We identify situations where another app may be a better fit.

We did not install or test competitor apps for these pages, and we don't score or rank them. A feature no source mentions is shown as "Not advertised", never as missing. App names and icons are trademarks of their respective owners, used only to identify the apps; Peptide Library is not affiliated with or endorsed by them.

Spotted something out of date? Tell us and we'll check it against the developer's sources. Corrections follow our editorial policy.

Research and educational use only. Not medical advice. Peptide Library does not sell peptides.