Best peptides apps, independently ranked.

Wrong units and missed reminders are clinical-grade risks. This list scores peptide calculators and trackers on six methodology pillars—functionality and privacy first, then reliability, cross-platform UX, honest pricing, and harm-reduction content. Every entrant completes the same 30-day notification protocol and the same reconstitution reference battery we publish in full.

Last updated: May 2026
Apps reviewed: 19
Test window: 30+ days
Sponsored placements: None

PeptIQ

iOS · Android · Web

Free reconstitution + dosingHalf-life decay vizApple Health sync

Overall score

4.1/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

Free reconstitution + dosingHalf-life decay vizApple Health sync

PeptIQ is the most complete peptide platform we found — calculators, blend support, half-life curves, interaction checker, vial scanner, and a 12-template protocol library across native iOS, Android, and a web app. The catch is the AI Protocol Builder layer: it adds value but also expands the privacy and "medical-advice posture" surface you would need to audit carefully.

What works

Rare full iOS, Android, and web parity
Free tier: calc, reminders, interaction checker
Active updates; citations on peptide profiles
Apple Health links metrics to dosing

What doesn't

AI protocol builder needs safety posture review
Cloud/AI widens telemetry and SDK audit scope
Premium locks half-life tracker and reminders
Subscription-only; no one-time purchase

Runner-up

Smart Peptide Tracker

Android (Google Play)

PIN + encryptionOne-time purchaseNo account required

Overall score

4.1/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

PIN + encryptionOne-time purchaseNo account required

The privacy-first counterweight to PeptIQ. PIN-locked encrypted storage, no account required to start, full import/export so you are never locked in, and a one-time purchase Premium that unlocks Stack Analyzer, Dosing Guide, and Progress Analytics. Functionality is genuinely deep — 200+ compounds, blend tracking, multi-step titration, biomarker correlation, partner profiles.

What works

Strong privacy posture on stated architecture
One-time purchase, no subscription
Stack Analyzer scores protocols on six axes
Body-map rotation plus biomarker tracking

What doesn't

Android-only caps UX score (3/5 in rubric)
No independent audit backing privacy claims
Planner and analytics skew power-user
Some features still maturing

Third place

PeptideCalc.io

iOS (iPhone & iPad)

Offline-firstOptional iCloud syncNo account required

Overall score

3.8/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

Offline-firstOptional iCloud syncNo account required

A native iOS calculator-and-scheduler with on-device defaults, optional iCloud sync, GLP-1 presets, and injection scheduling. No ads, no account requirement for core math, and the company is open about limited analytics/crash reporting. Math depth is solid for routine and most edge cases; protocol modeling is lighter than PeptIQ.

What works

No account for core calculations
Optional iCloud; on-device by default
Polished iPhone/iPad parity with offline core
GLP-1 and blend presets cut typing

What doesn't

iOS-only; no Android or web
Lighter stack/interaction modeling vs top two
Thin published harm-reduction content
Analytics limited but not zero

Fourth

Shotsy

iOS · Android

GLP-1 + retatrutideApple Health syncDrug-level charts

Overall score

3.8/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

GLP-1 + retatrutideApple Health syncDrug-level charts

The most polished tracker in the field, but originally GLP-1 focused — retatrutide and other research peptides are supported via settings rather than as headline features. iCloud sync, Apple Health integration, and estimated medication-level curves are best-in-class. Reconstitution math is shallower than peptide-purpose-built tools.

What works

Strong reliability and notifications in reviews
Privacy-first: on-device data plus iCloud
Native iOS + Android with solid parity
Drug-level charts from published PK data

What doesn't

GLP-1-first; weaker deep peptide-stack workflows
Subscription for the full feature set
Shallower reconstitution math vs calculator apps
Thin peptide-specific safety content

Fifth

PepCalc (by The Pepcalc Project)

iOS (iPhone & iPad)

U100 / U40 syringe presetsMulti-peptide blendsSaved protocols

Overall score

3.45/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

U100 / U40 syringe presetsMulti-peptide blendsSaved protocols

The veteran in the category — referenced on biohacking podcasts years before the current wave. Calculator-first focus, multi-peptide blend support, U100/U40 toggling, saved protocols, and remembered-input convenience. Deliberately narrow: it does not try to be a tracker or scheduler.

What works

Long track record, stable feature set
Blend math with per-peptide breakdown
No account; math with no obvious cloud tie-in
In-vial dose readout plus multi-syringe handling

What doesn't

Calc-only; no scheduling, reminders, or inventory
iOS-only
Little safety context beyond numeric results
No stack-aware features vs newer peers

Sixth

PepTracker: Dose Log

iOS

Peptides + GLP-1 + TRTCalendar viewEncrypted storage

Overall score

3.25/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

Peptides + GLP-1 + TRTCalendar viewEncrypted storage

A focused dose-log and protocol tracker that handles peptides, GLP-1s, and TRT side-by-side. Built-in dose calculator, reminders, and missed-dose notifications added in a recent update. Active developer who replies in store reviews. Some lingering "mark dose taken" bugs noted by users.

What works

Peptide, GLP-1, and TRT in one log
Encrypted storage; stated no data sale
Calendar + Home for quick daily glance
Developer active in store review threads

What doesn't

Users report bugs marking doses complete
iOS-only
Premium free trial unclear in listing
Reverse BAC calc and some tools still roadmap

Seventh

Peptide Library – Peptide Log

Android

200+ compound DBStacking + blendsOffline-first storage

Overall score

3.25/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

200+ compound DBStacking + blendsOffline-first storage

A dense Android-side combination of peptide reference library, dose calculator, lab-protocol tracker, blend handling, and inventory. Frequent updates per reviewers. One quirk worth flagging in your own audit: integrated vendor price indexing and affiliate links sit alongside health logging — a structural conflict the rubric's safety axis cares about.

What works

Large compound DB with mechanism notes
Offline-first secure local storage
Active dev; responsive to requests
mg/mcg/IU conversion plus blend calculator

What doesn't

Vendor pricing and affiliates beside health data
Android-only
Fast shipping brings bug churn per reviews
Safety mostly informational, not contextual

Eighth

SHOTLOG

iOS · Android

Custom protocolsBiolevel chartsTitration support

Overall score

3.15/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

Custom protocolsBiolevel chartsTitration support

Cross-platform biohacker-positioned tracker with mg/mcg/IU calculator, biolevel-in-body chart, titration and rest periods, and a 30-day premium demo. Improving rapidly — early reviews flagged automation gaps that the dev says have since landed. Privacy and audit details are limited in public materials.

What works

Similar feature sets on iOS and Android
30-day premium demo lowers commitment risk
Biolevel chart clarifies peak and trough timing
Titration ramp and taper for protocol changes

What doesn't

Privacy and data handling thinly documented
Early automation complaints; review ages vary
Subscription, not one-time purchase
Safety mostly disclaimer-level

Ninth

PeptideKit

iOS

Custom schedulesWeight + dose trackingFree with IAP

Overall score

3.15/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

Custom schedulesWeight + dose trackingFree with IAP

A no-nonsense iOS peptide companion that pairs injection logging with weight summary in one view — a combo many competing apps split. Active developer responsive in reviews. Editing a custom schedule has a "day-of only" quirk users have learned to work around. Limited public detail on data handling.

What works

Peptide log and weight summary together
Active dev; quick on feature requests
Free core plus IAP vs harsh paywall
Stable per user reports

What doesn't

Schedule edits need a day-of UI workaround
iOS-only
Privacy and architecture thinly documented
Modest calculator depth vs specialist apps

Tenth

Peptide Calculator App (by NextStrand)

iOS · Android

U20–U100 syringesBAC water + blendsPDF export

Overall score

3.05/5

Functionality & Accuracy
Privacy & Data Handling
Reliability
UX & Platform Coverage
Pricing & Code Transparency
Safety & Harm-Reduction Content

U20–U100 syringesBAC water + blendsPDF export

A cross-platform calculator with broad syringe-size coverage (U20/U30/U40/U100), blend calculator, BAC water calculator, peptide library, saved calculations with notes, and PDF export. Some user confusion around the free/paid boundary on Android, but the calculation surface is workable for routine protocols.

What works

iOS + Android coverage
Wide syringe sizes including U20 and U30
PDF export for handoffs
Saved calcs with notes

What doesn't

Android billing: free vs paid unclear
Privacy and telemetry poorly documented
Calculator-first; thin tracking and reminders
Static safety copy, few contextual prompts

Frequently asked, honestly answered.

How is the overall score calculated?

Each criterion gets a 1–5 rating against anchors published in our methodology, then weighted: Functionality 30%, Privacy 25%, Reliability 20%, UX 15%, Pricing 5%, Safety 5%. The weighted sum is the composite. No qualitative tiebreakers — when scores tie, we say so and explain why.

Why can a single-platform app outrank a cross-platform one?

UX & Platform Coverage is 15% of the composite. A polished iOS-only app that nails dosing math, ships reliable notifications, and keeps data local will beat a wide-footprint app that misses on the heavier functionality and privacy axes. Breadth never compensates for math errors.

Are any placements paid or sponsored?

No. We buy every subscription and one-time unlock with our own funds, decline developer promo codes for scored reviews, and refuse paid placement entirely. Affiliate links, where present, never influence ordering and are disclosed at the entry level.

Why are PeptIQ and Smart Peptide Tracker tied?

Both weighted composites round to 4.10 from opposite directions. PeptIQ wins on functionality, UX, and platform reach. Smart Peptide Tracker wins on privacy and pricing transparency. Editor's pick goes to the broader product; the specialist pick goes to the privacy-first one.

What does the 30-day reliability test actually cover?

Each app runs at least 200 scheduled notifications across 30 days, time-zone changes, and intentional offline windows. We log delivery rate, missed doses, sync conflicts, and data persistence. The full per-app log ships alongside each review and is available on request.

An app I use isn't on the list — why?

We review apps that meet a minimum bar: active development, public store presence, and a working calculator or tracker. If you think we missed one worth scoring, send it via the contact form. The list refreshes quarterly and qualifying entrants get folded into the next round.

Should I treat any of these apps as medical advice?

No. Every app on this page — and the rubric itself — is a tracking and calculation tool. Apps that drift into a prescribing posture get capped at 1/5 on Safety. Talk to a clinician about protocol choices, dose changes, and any unexpected reactions.