REBUILDRX vs ProStack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
REBUILDRX
Access personalized fitness programs, track workouts, nutrition, and habits, and connect with coaches. Achieve your health goals with guided support and detailed progress metrics.
- Personalized training plans
- Exercise demonstration videos
- Meal and nutrition tracking
- Daily habit tracking
- Progress metrics and goal setting
- Direct coach messaging
- Integration with health devices
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With the REBUILDRX App, you’ll have access to programs designed to help you lose fat, build lean muscle, and become the happiest, healthiest version of yourself. Whether you’re part of The Metabolic Rebuild Method, Bootcamp, or any of my signature coaching experiences, you’ll have everything you need right at your fingertips. Inside the app, you can follow and track your workouts, nutrition, habits, and results — all with the guidance and support of me and my expert team. FEATURES: Access personalized training plans and track workouts step-by-step Follow along with exercise demonstration videos Track your meals and make better food choices Build consistency by staying on top of daily habits Set goals and track progress with detailed metrics Earn milestone badges for new personal bests and habit streaks Message your coach directly in real time Upload progress photos and track body measurements Get push notification reminders for workouts and activities Connect with Apple Watch to track workouts, steps, and habits right from your wrist Sync with Apple Health, Garmin, Fitbit, MyFitnessPal, Withings, and more to track sleep, nutrition, body stats, and composition Download the Katie Little Fitness App today and start rebuilding your health with a system that actually works for real women in real life.
ProStack
Log your peptide doses, set reminders, and track your progress with photos and measurements. Access a library of peptide information and manage your entire protocol on a calendar. Offers a free 7-day trial.
- Dose logging
- Scheduled reminders
- Protocol calendar
- Progress photos
- Measurement tracking
- Peptide library
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Track your peptides like you track your macros. You log your food. You log your lifts. ProStack logs your protocol — every dose, every reminder, every week of progress — in one place. • Never miss a dose — reminders at your scheduled time • Your whole protocol on one calendar — active, paused, and completed cycles • See it working — weight, measurements and side-by-side progress photos • Peptide library — storage, handling and research references • Try everything free for 7 days — no card needed ProStack Guide is a tracking tool for research and personal record-keeping purposes only. It is not medical advice and does not diagnose, treat, or prescribe. Always consult a qualified healthcare professional before beginning or changing any protocol. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: REBUILDRX at none against ProStack's 2. REBUILDRX also leads on device support (4 vs 1). ProStack's advantage is update cadence (every 5 days vs monthly). On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. ProStack sells 2 in-app purchases, starting at $4.99 per month. REBUILDRX asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for REBUILDRX against 5.0 for ProStack. Both are backed by a comparable volume of ratings — 8 and 3 respectively.
REBUILDRX ships an update monthly, ProStack every 5 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.
| Parameter | REBUILDRX | ProStack |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (8 ratings) | 5.0 (3 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 8 — better | 3 |
| Update frequency | Monthly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone |
| Requires iOS | 15.5 — better | 16.4 |
| Further details — not scored | ||
| Size | 164 MB | 65 MB |
| Age rating | 4+ | 17+ |
| Developer | Avant All Things Health and Wellness, LLC | JESSIE GRACE CHRISTIE |
Customer experience
REBUILDRX
ProStack
In-app purchases
REBUILDRX
No in-app purchases
ProStack
- Premium Monthly7 Days trial$4.991 Month
- Premium Annual7 Days trial$49.991 Year









