Principle Guy vs Flow Gym
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Principle Guy
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Methods are many, principles are few. Principle Guy is an app and a community for movement you will enjoy for life. Everyone with a body is an athlete. Whether you start from zero or have trained for years, the training adapts to you. WHAT YOU GET Home and gym workouts. Ready-made templates for strength, cardio, pilates, yoga and mobility, or build your own. Erik's voice in your ear. He guides you through every exercise, counts you down and reminds you of the technique. A ladder for every movement. Master a level and the app moves you up. No guessing. Progress and records. Workout history, personal records and your daily streak. Nutrition. Calories and macros, a food database, recipes with photos, and food from MyFitnessPal and other apps through Apple Health. Journal. Sleep, weight, steps, water and more, also synced from Apple Health. Principle Check-in. A weekly overview of your training, metrics and nutrition. Challenges. Challenge a friend and train together. Community. Chat with people on the same path, and with Erik himself. WHO IS ERIK Master's degree in sports science, European Jiu-Jitsu champion, WFF PRO bodybuilder and head coach at Epix Gym. He combined football, bodybuilding, calisthenics and science into the Fitness Level system. Repeat and enjoy.
Flow Gym
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Vitajte v našej inovatívnej mobilnej aplikácii, ktorá vám umožní ešte pohodlnejšie a efektívnejšie využívať všetky výhody nášho fitness centra. S touto aplikáciou môžete jednoducho a rýchlo nakupovať permanentky priamo z pohodlia vášho smartfónu. Či ste doma, v práci alebo na cestách, stačí niekoľko dotykov a máte svoju permanentku k dispozícii kedykoľvek a kdekoľvek.
Screenshots
Verdict
The clearest difference is update cadence: Principle Guy at every 2 days against Flow Gym's monthly. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Principle Guy ships an update every 2 days, Flow Gym monthly. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.
| Parameter | Principle Guy | Flow Gym |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.5 | 14.0 — better |
| Further details — not scored | ||
| Size | 90 MB | 108 MB |
| Age rating | 4+ | 4+ |
| Developer | ERIK GARAJ | OnGym s.r.o. |
In-app purchases
Principle Guy
No in-app purchases
Flow Gym
No in-app purchases









