Peptide Tracker, the app at peptidetracker.ai (seller Flat Six Labs), is a free tracker for iPhone and Android with a per-compound library that includes dosing information; core tracking needs no account, with optional sign-in to sync across devices. Pepti is a paid, iPhone-only tool that publishes no dosing content at all, has no account and no cloud, and keeps everything on the device. They do the same reconstitution arithmetic; they differ mainly on dosing content and price.
By Tessaro Pty Ltd, the maker of Pepti · Reviewed
This comparison is written by the maker of Pepti. The facts about Peptide Tracker below come from its own website (peptidetracker.ai) and its App Store listing, read in October 2026, and are dated and linked in the Sources section. Two points we expected to go one way turned out otherwise on checking, and we have corrected them here rather than repeat a convenient assumption.
| Pepti | Peptide Tracker (peptidetracker.ai) | |
|---|---|---|
| Approach | Measurement & record-keeping only; no dosing content | Tracker with a per-compound library that includes dosing info (Oct 2026) |
| Platforms | iOS 17.2+ | iOS and Android, plus a web calculator (Oct 2026) |
| Price | $16.99/mo or $69.99/yr USD, 14-day free trial on annual; one tier | Free core tracking; optional Founding Member membership; App Store in-app purchases approx. $5 to $80 (Oct 2026) |
| Account & data | No account, no cloud sync; data on-device, apart from optional AI coach chats | Core tracking needs no account (June 2026 launch release); optional accounts + cloud sync via Apple/Google/email, data then in a US-hosted database (privacy page, Oct 2026) |
| Dosing content | None, by design | Yes — per-compound "typical dosing", routes, half-life and storage notes; dosing protocols (Oct 2026) |
| Reconstitution math | Yes; vial + diluent to draw volume and U-100 units | Yes; vial strength + diluent + target to a U-100 draw (Oct 2026) |
| Injection site rotation | Yes, 12-site | Yes; logs and shows your last site (Oct 2026) |
| Cited sources on site | Yes; PubMed/label-linked compound pages | Not assessed (Oct 2026) |
It is free to start and runs on both iPhone and Android, so cost and platform are rarely a barrier. Its per-compound library puts half-life, dosing, routes and storage notes next to the log, which many people want in one place, and it offers reminders and a free web reconstitution calculator (Oct 2026). If you want a no-cost tracker, you are on Android, or you want dosing information built into the app, it is the better fit and Pepti is not the tool for you.
Pepti's difference is what it refuses to do. It carries no dosing content, by design — it converts a figure you already have into a draw volume and U-100 syringe units and never supplies the figure. It keeps everything on the device with no account and no cloud at all; Peptide Tracker, by contrast, offers optional accounts and cloud sync for cross-device use (their privacy page, Oct 2026), while Pepti's only exception is the optional AI coach conversation. Its rotation is a defined 12-site scheme, and its compound reference pages cite their sources. If you specifically do not want dosing guidance on your phone, that is the whole point of it.
The arithmetic is effectively the same: both convert vial strength, diluent and a target into a U-100 draw, and both log and rotate injection sites. If a reconstitution calculator and a site log were your only needs, either would serve. The decision sits above the features, in three choices — whether the app supplies dosing content, how it handles data (on-device only, or with optional cloud sync), and price.
No single winner, only a fit:
For the wider field, see how Pepti compares to other trackers, learn what a peptide tracking app does, or read more about the Pepti peptide tracker.
Not to start. Their June 2026 launch release says core tracking is free with no account required to get started, and their privacy page describes an anonymous on-device identifier by default. They also offer optional accounts and cloud sync - Sign in with Apple, Google or email - with synced data then stored in a US-hosted database (their privacy page, Oct 2026). Pepti has no account and no cloud at all; your data stays on the device apart from optional AI coach chats.
Yes, core tracking is free and requires no subscription, per their site. There is an optional annual Founding Member membership that supports development and adds early access; their App Store listing shows in-app purchases from about $5 (a tip) to $80 (Founding Member), Oct 2026. Pepti is paid: $16.99 per month or $69.99 per year, with a 14-day free trial on the annual plan.
Yes. Their site describes a free peptide tracking app for iPhone and Android, plus a web calculator (Oct 2026). Pepti is iOS only and requires iOS 17.2 or later, so if you are on Android, their app is the option that fits.
They differ by design. Peptide Tracker publishes a per-compound library that, per their site, includes half-life, typical dosing, routes and storage notes, and their App Store listing mentions dosing protocols for specific compounds (Oct 2026). Pepti publishes no dosing content anywhere: you enter a figure you already have and it does the arithmetic, never suggesting what the figure should be.
Both have a reconstitution calculator. Theirs converts vial strength, diluent volume and a target into a draw in U-100 syringe units (Oct 2026); Pepti does the same arithmetic from a figure you already have and adds 12-site rotation and on-device, account-free records. Choose on editorial stance and platform, not on the math, which is equivalent.
Not medical advice. Pepti is a record-keeping and measurement tool, not a medical device. Peptide Tracker details are from its own public pages, October 2026; products change, so verify current details on their own pages.
Get Pepti on the App Store