VitaLog vs Hevy: Which Fitness Tracker Is Best for 2026?

Objective side-by-side comparison across workout logging, TRT support, pharmacokinetics, bloodwork tracking, privacy, platform, and pricing. Published by the VitaLog team, we note the opinionated parts clearly.

Last updated: 2026-04-21 · Maintained by the VitaLog team

At a glance

Where Hevy shines

Hevy is a genuinely excellent pure-gym tracker. Strengths:

• Workout UX polish. Set-tracker, rest timer, 1RM estimation, PR detection are all tightly-designed. Entering a workout feels faster and smoother than in any general-purpose app.
• Social graph. Follow friends, see their workouts, like sessions, share routines. For users who enjoy the community-training-log aesthetic, this is among the strongest implementations in the workout-app category.
• Apple Watch integration. Start/stop sets, log reps, view rest timer directly on the watch. True native integration, not a web view wrapper.
• Exercise library. Large, well-curated, includes video demonstrations for many exercises.
• Routines. Pre-built routines for common programs (5/3/1, PPL, Strong Curves, etc.) with easy customization.
• Pro tier pricing. ~$23.99/year (verify at Hevy.com) is competitive with peers for the advanced analytics + custom routines + widget set it unlocks.

If your entire digital-fitness workflow is "log my gym session and watch my lifts trend over months," Hevy is an excellent choice and has likely been recommended to you by someone who lifts seriously.

Where VitaLog shines

VitaLog covers a broader surface by design. Strengths Hevy does not offer:

• Pharmacokinetic engine. 330 compounds (peptides, TRT esters, SERMs, AIs, GLP-1 agonists) with published kinetics, PK simulation (Bateman, two-compartment, biphasic), variability envelopes, and PubMed citations. Useful for anyone on TRT, peptides, or GLP-1 therapy.
• Bloodwork trend intelligence. Import two or more panels; VitaLog detects rising/falling trends, persistently-out-of-range markers, hematocrit alerts at 54%, AST/ALT ratio patterns, with age- and sex-indexed reference ranges. See the TRT bloodwork guide for the full panel coverage.
• Vermeulen free-testosterone calculator. Compute free and bioavailable testosterone from total T + SHBG + albumin using the 1999 quadratic. Standalone calculator.
• Peptide dose + reconstitution calculator. Free tool covering every common research peptide and GLP-1 agonist.
• TRT and cycle tracking. Daily/weekly/monthly schedules with injection-site rotation, dose adherence, and cycle-phase visualization.
• Zero-knowledge progress-photo sync. Photos encrypted client-side with AES-256-GCM before upload; the server never sees plaintext. See the full explainer.
• No ads, no paid tier. Everything is free, and there is no "Pro" upsell. No data shared with advertising networks or data brokers.
• One-file JSON export. GDPR Article 20 data portability as a single click.
• Local-first default. No account required for basic use; everything works offline as a PWA; cloud sync is opt-in.

Detailed feature matrix

Who should use which

Stay with (or switch to) Hevy if:

• Your digital-fitness workflow is 95% pure gym logging.
• You have and use an Apple Watch during workouts.
• You value the social graph (seeing friends' workouts, getting likes).
• You don't track bloodwork, peptides, or TRT.
• You want widgets and the paid-tier analytics that Hevy Pro unlocks.

Use VitaLog if:

• You're on TRT and want integrated bloodwork trend analysis with PK modeling.
• You use peptides or GLP-1 agonists (semaglutide, tirzepatide) and want the dose calculator + cycle tracking.
• You want all your health data (workouts, nutrition, journal, bloodwork, photos) in one private tool rather than scattered across four apps.
• You care about zero-knowledge encryption for progress photos.
• You prefer free-forever over freemium-with-upsell.
• You use multiple platforms (Windows desktop + Android phone, etc.) and want a single PWA that works on all of them.

Use both:

Some users run Hevy for gym sessions (Watch integration, quick rest-timer) and VitaLog for TRT / peptide / bloodwork tracking. Nothing wrong with that, the tools complement rather than conflict. Export workout CSV from Hevy periodically into VitaLog's JSON format for a unified archive if long-term consolidation matters.

Migrating from Hevy to VitaLog

Hevy exports workouts as CSV from Settings → Data. VitaLog imports a single JSON file (Settings → Import). A direct CSV-to-JSON migration tool is not yet built, on the roadmap. Motivated users can manually map columns, or pick a migration cutover date where Hevy handles history and VitaLog handles new sessions.

The honest part

This page is on vitalog.io, so we have a conflict of interest. A few things we try to do honestly:

• Hevy really is better at pure gym UX, polished rest timer, quick entry, strong social features. We don't claim otherwise.
• Apple Watch integration is a legitimate advantage for Hevy, and VitaLog has no immediate plan to match it at native fidelity (PWA limitation). For watch-first gym users, that alone is a reason to prefer Hevy.
• Hevy's social graph is a network-effect asset VitaLog deliberately didn't pursue; this is a feature difference, not a defect.
• If Hevy works for you, there is no reason to switch. This page exists for users whose needs have outgrown a pure gym tracker, not for anyone Hevy serves well.

Frequently asked questions

What's the main difference between VitaLog and Hevy?

Hevy is a workout-focused app with excellent UX for logging sets, reps, and weight, primarily in the gym. VitaLog is a broader health-tracking platform that includes workout logging plus pharmacokinetic simulation for 330 compounds, TRT-specific bloodwork intelligence, a Vermeulen free-testosterone calculator, cycle tracking, nutrition, and zero-knowledge encrypted progress-photo sync. Use Hevy if you want a pure gym tracker with strong social features; use VitaLog if you want a unified workspace for workouts, TRT, peptides, and bloodwork.

Is Hevy better for gym workouts?

Hevy has a more polished rest-timer, better Apple Watch integration, and a larger exercise-social graph (friends, likes, workout sharing). If your workflow is purely gym-logging and you value social features, Hevy is well-designed. VitaLog's workout tab covers the same set-rep-weight-RPE-PR primitives but without the social network, which some users prefer for privacy.

Can Hevy track my bloodwork or peptides?

No. Hevy is a workout tracker, it does not include bloodwork analysis, peptide dose calculation, pharmacokinetic simulation, TRT support, or compound-interaction alerts. If any of these workflows matter to you, they would live in a separate app (or be absent). VitaLog covers all of them in one workspace.

How do the pricing models compare?

VitaLog is free. No paid tiers, no ads. Hevy has a free tier with Apple Watch support and workout logging, plus "Hevy Pro" (approximately $23.99/year as of early 2026) that unlocks advanced analytics, unlimited routines, custom widgets, and body-measurement tracking. For a casual gym user the Hevy free tier is sufficient; for a power user the Pro tier is inexpensive. VitaLog offers more capability at the free tier but less polished pure-gym UX. Verify Hevy's current pricing on their site before making a decision.

What about privacy?

VitaLog encrypts progress photos client-side with AES-256-GCM before upload, the server never sees plaintext. Account data is local-first by default; cloud sync is optional and end-to-end encrypted at rest. Hevy stores your workouts on their servers with standard server-side encryption (client-side encryption is not advertised), and uses standard analytics per their public privacy policy. For users who consider progress-photo privacy important, the material difference is that VitaLog's architecture makes plaintext photos subpoena-unreachable, not a claim Hevy makes.

Can I migrate from Hevy to VitaLog?

Partially. Hevy exports workout data as CSV. VitaLog accepts a structured JSON import (single-file format) but does not yet have a one-click Hevy CSV importer. Manually mapping Hevy's CSV columns into VitaLog's workout-log schema is straightforward for motivated users but not a one-click path. This is on the roadmap.

Who should use Hevy?

Users whose workflow is 95% gym logging, who value social features (friends, workout sharing, leaderboards), who have an Apple Watch and want integrated workout control, and who don't track bloodwork, peptides, or TRT. In our view, Hevy is among the most polished apps in pure gym tracking.

Who should use VitaLog?

Users on TRT who want integrated bloodwork trend analysis and PK modeling; peptide or GLP-1 users who want the dose calculator and cycle tracking; users who want all their health data (workouts, nutrition, journal, bloodwork, photos) in a single private tool; users who want clinical-grade pharmacokinetic analysis alongside everyday gym logging; users who care about zero-knowledge encryption for progress photos.

Related resources

• TRT bloodwork monitoring, complete guide
• Peptide dose calculator
• Zero-knowledge encryption explained
• All comparisons