RetroFit! vs PepKit
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RetroFit!
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I was 75 pounds overweight with a BMI of 32 (in the obese category). To address this, I began going to the gym and realized the need to track my calories. Given my familiarity with software development, I decided to create an app for this purpose. Over the following months, I used an iterative design process to develop the app, focusing on supporting my weight loss journey. I added buttons to track food and workout calories, and included settings to calculate my basal metabolic rate (BMR) to monitor my total daily calorie expenditure. The addition of BMR settings allowed me to understand the significant impact of activity level on daily calorie needs. While calories burned during a workout contribute to weight loss, the increase in metabolism from higher activity levels, as shown in the BMR calculations, played a substantial role in my overall weight loss. Initially developed for personal use, the app underwent multiple design iterations to assist me in my weight loss efforts. As a result, I am no longer obese or even overweight, but at a normal optimal weight according to BMI calculations (BMI is calculated in the app in the passive view). Although my primary goal was personal, I am now publishing RetroFit in the hope that it will help others interested in weight loss and calorie management to better understand their calorie consumption. Notes: In addition to calorie tracking, I followed a whole foods plant-based diet. My favorite music genre to listen to while working out is 80s rock and roll, which inspired the app's 80s-style design, resembling a calculator from that time period, but for calories.
PepKit
Precisely track your peptide protocols with a structured system. Log doses, calculate them accurately, and stay consistent with smart reminders and a clean interface. Designed for serious tracking.
- Precision dose logging
- Built-in dose calculator
- Structured scheduling
- Smart reminders
- Clean interface
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Keep your peptide tracking organized. PepKit brings your logs, schedules, reminders, and history together in one place. Record your entries, organize your routine, and review your past activity through a clean, simple interface. EASY LOGGING Log your entries quickly and maintain a clear record of your personal routine. FLEXIBLE SCHEDULING Create daily or weekly schedules that fit your routine. HELPFUL REMINDERS Set notifications to remind you when it’s time to log an entry or check your schedule. TRACKING HISTORY Review previous entries and keep your records organized in one place. CLEAN, SIMPLE DESIGN Access your logs and schedules through an interface designed for straightforward everyday use. PepKit is intended for personal tracking and organization. It does not provide medical advice, diagnosis, or treatment recommendations. Consult a qualified healthcare professional for medical guidance. SUBSCRIPTION TERMS PepKit offers auto-renewing subscriptions for premium features. A subscription is required for full access. A 7-day free trial is available to eligible new subscribers. Payment will be charged to your Apple ID account at confirmation of purchase or after your free trial ends, if applicable. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. To avoid being charged after a free trial, cancel at least 24 hours before the trial ends. You can manage and cancel your subscription in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.pepkit.ai/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: RetroFit! at none against PepKit's 2. RetroFit! also leads on iOS requirement (17.2 vs 26.0). PepKit's advantage is update cadence (every 6 weeks vs every 4 months). On price, ads and device support 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. PepKit sells 2 in-app purchases, starting at $5.99 per 7 days. RetroFit! asks for nothing beyond the download.
RetroFit! ships an update every 4 months, PepKit every 6 weeks. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.
| Parameter | RetroFit! | PepKit |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.8 (163 ratings) — better |
| Positive reviews | — | 87.5% of reviews |
| Number of ratings | — | 163 — better |
| Update frequency | Every 4 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone | iPhone |
| Requires iOS | 17.2 — better | 26.0 |
| Further details — not scored | ||
| Size | 1 MB | 17 MB |
| Age rating | 17+ | 4+ |
| Developer | Nicholas Pompea | Loona LLC |
In-app purchases
RetroFit!
No in-app purchases
PepKit
- Weekly7 Days trial$5.997 Days
- Annual7 Days trial$44.991 Year









