RUNology vs Principle Guy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RUNology
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Prvá bežecká aplikácia, ktorá analyzuje vašu bežeckú formu a vytvorí komplexný tréningový plán, ktorý vyhodnotí riziká vášho bežeckého štýlu, navrhne cvičenia na jeho nápravu a nastaví bežecké tréningy s takou intenzitou, akú vaše telo zvládne. Runológia bude: 1. pozri sa, ako beháš a povedz si, čo potrebuješ zlepšiť 2. nastavte si tréningový systém rešpektujúci váš životný štýl a čas 3. sprevádzať vás na ceste za vašimi bežeckými snami spôsobom, ktorý vás bude baviť, tešiť a motivovať Terms of Use: https://www.runology.app/storage/app/media/ENG_terms-of-use-20230501-1.pdf
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.
Screenshots
Verdict
The clearest difference is in-app purchases: Principle Guy at none against RUNology's 2. Principle Guy also leads on update cadence (every 2 days vs fortnightly). On price, ads, device support and iOS requirement 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. RUNology sells 2 in-app purchases, starting at $8.99 per month. Principle Guy asks for nothing beyond the download.
RUNology ships an update fortnightly, Principle Guy every 2 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.
| Parameter | RUNology | Principle Guy |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 — better | 15.5 |
| Further details — not scored | ||
| Size | 106 MB | 92 MB |
| Age rating | 17+ | 4+ |
| Developer | SHEmoves | ERIK GARAJ |
In-app purchases
RUNology
- MAX$8.991 Month
- LEVEL UP$8.991 Month
Principle Guy
No in-app purchases









