Alethea vs PepStack: Browser Tracker vs Outcomes OS

*Updated October 5, 2026*

Short answer: Pick PepStack if you want a browser-first protocol tracker with free calculators and a clear Free → Pro path around schedules, inventory, and progress AI. Pick Alethea if the job is “is this working?” — adherence + labs + multi-brand wearables + AI on *your* data.

Alethea Health wrote this page. We disclose that up front. Competitor facts are summarized from public vendor pages as of October 2026 and may change — verify on their site before you buy. This page is about PepStack (pepstack.io), not PepStack Pro (pepstackpro.com) or similarly named apps.

Side-by-side

PepStack — browser-first protocol workspace

PepStack combines a tracker workspace (protocols, dose logs, calendar, inventory on Pro) with a free calculator suite (reconstitution, dosage, syringe, half-life). Free forever covers calculators, protocol creation and dose logging, calendar view, and CSV import/export. Pro (~$4.99/mo per their pricing page) adds inventory, progress tracker, smart injection site suggestions, AI insights, cloud sync, advanced analytics/adherence, and exports.

Honest fit: if you live in the browser and want spreadsheet replacement + math tools without a native install, PepStack is a real competitor for the exact “peptide protocol tracker” query.

Alethea — outcomes correlation on web/PWA

Alethea is a peptide-first personal health OS: schedules and adherence (including skips and unlogged doses), reconstitution math, vial inventory, lab uploads, wearable sync (Apple Health, Fitbit, Withings, Garmin, Oura, WHOOP, and Polar), and AI chat from your numbers.

Honest limits: web / PWA only. Free = no wearable sync. Not HIPAA-covered. No BAA. Not a pharmacy. Not Alethea Medical.

Pricing (matches live pricing): Free $0; Premium $9.99/mo or $99.99/yr; Pro $29.99/mo or $299.99/yr; Clinic $1,990/yr (up to 10 patients, 3 staff; month-to-month $199/mo); Founding Member Pro $9.99/mo locked (first 50, web only).

Pick PepStack if…

• Browser-first tracking + free calculators is enough
• You want Free forever protocol logging before paying for inventory / AI insights
• You’re fine waiting on native apps (planned per their FAQ)

Pick Alethea if…

• You need doses next to multi-brand wearables and labs
• You want AI on *your* longitudinal stack, not only progress correlation
• You’re fine with web / installable PWA

Start tracking free on Alethea →

Related: Best peptide tracker apps · What is a peptide protocol tracker?

*Educational reference only — not medical advice. Alethea reads your data and surfaces patterns; it does not diagnose, prescribe, or replace a clinician. Alethea Health is not a pharmacy, is not HIPAA-covered, does not sign a BAA, and is not affiliated with Alethea Medical (aletheamedical.com).*

Frequently asked questions

What is the difference between Alethea and PepStack?

PepStack (pepstack.io) is a browser-first peptide protocol tracker and calculator suite with free protocol logging and Pro features like inventory, progress tracking, and AI insights. Alethea is also web/PWA but centers whether a protocol is working — schedules and adherence, labs, multi-brand wearables, and AI over your longitudinal stack.

How much does PepStack cost?

Per pepstack.io/pricing as of Oct 2026: Free forever (calculators, protocol creation and dose logging, calendar, CSV import/export). Pro is about $4.99/mo with a yearly option advertised. Verify on their pricing page.

Does PepStack have a native iOS or Android app?

As of Oct 2026, PepStack's FAQ says the Pro tracker is a mobile-optimized web app and that native iOS/Android apps are planned. Prefer their site for current platform status.

Is Alethea HIPAA compliant?

No. Alethea is not HIPAA-covered and does not sign a BAA.

Best peptide tracker apps · Peptide protocol tracker · Free dose calculator · Pricing