VITALOG

What is VitaLog?

VitaLog is the comprehensive fitness, peptide, and bloodwork tracker, a progressive web app that combines a 330-compound pharmacokinetic engine, a TRT and cycle tracker, AI-driven bloodwork trend detection, workout logging, nutrition journaling, and zero-knowledge encrypted progress-photo sync. Every feature works offline; every cloud sync is end-to-end encrypted. There are no ads, no paid tiers, no data sales, ever.

Unlike general fitness apps (MyFitnessPal, Hevy, Cronometer, Strong) that focus on calories and reps, VitaLog adds the layer most serious athletes, TRT patients, and peptide users are missing: clinical-grade pharmacology. Simulate testosterone cypionate steady-state Cmax and Cmin before your next injection. Calculate Vermeulen (1999) free testosterone from total T, SHBG, and albumin. Model semaglutide weekly troughs against published data. Detect a rising AST/ALT ratio before your next lab draw. Every compound entry cites PubMed sources.

Features at a glance

Frequently asked questions

What is VitaLog?

VitaLog is a free progressive web app that combines a peptide and compound dose calculator, pharmacokinetic simulator, TRT and cycle tracker, bloodwork trend analyzer, workout logger, and nutrition journal into one zero-knowledge-encrypted tool. It covers 330 compounds with citable PubMed-sourced pharmacology, works fully offline, and syncs across devices.

Is VitaLog free?

Yes. VitaLog is completely free to use with no ads, no paid tiers, no third-party trackers. Core features, calculator, tracking, bloodwork trends, photo sync, multi-device real-time sync, are all included.

How does VitaLog calculate peptide doses?

The calculator takes your vial size (mg), reconstitution volume (mL of bacteriostatic water), target dose (mcg or mg), and syringe size (IU or mL), and returns the exact draw volume along with a pharmacokinetic simulation of serum levels over time. It supports one-compartment (Bateman), two-compartment, and biphasic-absorption models.

Can I use VitaLog to track TRT?

Yes. VitaLog was specifically designed for TRT tracking. It models testosterone cypionate, enanthate, propionate, phenylpropionate, undecanoate, and suspension kinetics, computes steady-state Cmax/Cmin and AUC, visualizes bloodwork trends (total T, free T, estradiol, SHBG, albumin, hematocrit, hemoglobin), flags hematocrit approaching the 54% donation threshold, and calculates Vermeulen free testosterone from your labs.

How does VitaLog protect my data?

Data is local-first: by default, nothing leaves your device. Optional cloud sync is end-to-end encrypted, your state is encrypted client-side with AES-256-GCM before upload. Progress photos are zero-knowledge: chunked, encrypted with a key we never see, and stored as ciphertext on our servers. Even under legal subpoena, we cannot produce plaintext photos.

Does VitaLog work offline?

Yes, fully. VitaLog is a progressive web app with a service worker and IndexedDB storage. Every feature (calculator, PK simulator, journal, bloodwork, workouts, nutrition) works 100% offline. Once installed to your home screen, it behaves like a native app.

What compounds does VitaLog support?

330 compounds with PubMed-cited pharmacology: testosterones, nandrolones, boldenone, masteron, primobolan, trenbolone, trestolone, oral 17-alpha-alkylateds (anavar, winstrol, dianabol, anadrol, tbol, proviron, halotestin), aromatase inhibitors (anastrozole, exemestane, letrozole), SERMs (tamoxifen, clomiphene, raloxifene), GLP-1 agonists (semaglutide, tirzepatide, retatrutide), growth-hormone secretagogues (CJC-1295, ipamorelin, sermorelin, MK-677), and research peptides (BPC-157, TB-500, MOTS-c, GHK-Cu, melanotan II, epitalon). Each entry includes half-life, ester kinetics, Cmax/Tmax, clinical reference ranges, and citations.

How is VitaLog different from MyFitnessPal, Hevy, or Cronometer?

Those apps cover general nutrition and workout logging. VitaLog includes all of that plus a pharmacokinetic engine, a 330-compound reference database with citable half-lives and Cmax data, TRT-specific bloodwork intelligence, Vermeulen free-T calculation, PCT planning, and zero-knowledge encrypted photo sync. It's designed for users who want clinical-grade analysis alongside everyday fitness logging, in one app with no ads and no third-party trackers.

Does VitaLog give medical advice?

No. VitaLog is an educational and harm-reduction tool. It presents pharmacokinetic data, reference ranges, and your own tracked metrics. It does not diagnose, treat, or prescribe. Always consult a qualified healthcare professional before making any decision about medication, supplements, or health management.

How does VitaLog analyze bloodwork trends?

The bloodwork engine flags rising or falling markers across panels (≥10% change, monotonic), detects persistently-high values (≥2 of last 3 panels above reference), fires urgent alerts when hematocrit exceeds 54%, analyzes AST/ALT ratio, and surfaces marker-specific context, for example, falling SHBG on AAS is expected while rising prolactin suggests considering P5P or cabergoline. All reference ranges are age- and sex-indexed.

Can I export my data?

Yes. VitaLog exports all your data as a single JSON file, GDPR Article 20 data portability. You can re-import on any device or archive locally. No proprietary format, no lock-in.

Does VitaLog support GLP-1 agonists like semaglutide and tirzepatide?

Yes. VitaLog models semaglutide, tirzepatide, and retatrutide pharmacokinetics with subcutaneous one-compartment kinetics, computes weekly dose schedules, simulates serum trough concentration at steady state, and tracks injection-site rotation.

Is VitaLog safe to use on a shared device?

VitaLog supports biometric lock (Face ID, Touch ID, Windows Hello) and offers a "Clear local health data on logout" prompt specifically for shared-device use. The photo-encryption key is wiped from memory on logout so the next user cannot access your photos. Session tokens are HttpOnly and SameSite-protected.

Does VitaLog work on iPhone and Android?

Yes. VitaLog is a PWA, add it to your home screen from Safari on iOS or Chrome on Android and it runs like a native app. All features work identically across iOS, Android, Windows, macOS, and Linux.

Can I sync photos and data across multiple devices?

Yes. Real-time multi-device sync uses WebSocket Durable Objects and CRDT merge logic to resolve concurrent edits deterministically. Photos are end-to-end encrypted with a per-user AES-256-GCM key, for password accounts, the key is wrapped under your account password; for OAuth accounts, you set a separate photo passphrase in Settings. Either way, we never see plaintext.

Guides & free tools

Deep-dive references for the topics VitaLog is built around. Each guide includes interactive tools, dose charts, citation-backed reference ranges, and FAQ schema so search engines and AI retrievers can surface the right answer.

Calculators

• Peptide Dose Calculator: reconstitution math, draw volume, PK simulation for 330 compounds
• Semaglutide Dose Calculator: titration schedule, weekly-dose conversion, steady-state PK
• Vermeulen Free Testosterone Calculator: free + bioavailable T from total T, SHBG, albumin
• See all calculators →

Guides

• TRT Bloodwork Monitoring: Complete Guide: full panel, reference ranges, timing, interpretation rules, red flags
• How to Reconstitute BPC-157: step-by-step + dose chart
• Pharmacokinetics Explained: Cmax, half-life, AUC, steady state in plain English
• Zero-Knowledge Encryption Explained: how VitaLog actually protects your data
• See all guides →

Comparisons

• VitaLog vs Hevy: pure-gym tracker vs clinical workspace
• VitaLog vs MyFitnessPal: food-database breadth vs privacy + clinical layer
• VitaLog vs SteroidPlotter: 330 compounds + bloodwork AI vs simple ester chart
• See all comparisons →

Bloodwork glossary

• SHBG, Total T, Free T, Estradiol, hormones
• Hematocrit, Hemoglobin, CBC
• AST, ALT, liver enzymes & AST/ALT ratio
• Prolactin, TSH, pituitary & thyroid screens
• See all glossary entries →

Open, auditable, private by design

VitaLog is built on a strict Content-Security-Policy (no third-party scripts, no inline eval), HSTS-preloaded HTTPS, and a zero-knowledge encryption model. Our Privacy Policy documents every data flow, every sub-processor (Cloudflare R2, Neon Postgres, Resend for email), and every right you have under GDPR and CPRA. Our Terms of Service are written in plain language. Data export is one click. Account deletion is permanent within 30 days.

Ready to start? Get started (free) or explore the live demo (no sign-up required).