Feynn vs GymBook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Feynn
This app helps you plan and track your gym workouts with a customizable interface. Organize exercises by muscle group, add descriptions and images, and log previous performance to motivate improvement. Live workout tracking is available from the lock screen.
- Customizable workout planner
- Exercise cataloging
- Organize by muscle group
- Add exercise details and images
- Log previous marks
- Visual data representations
- Live workout tracking on lock screen
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Feynn is a fully customizable workout planner and tracker that lets you take control of your workouts. Feynn allows you to catalog your existing workout routines and activities so that you don't have to commit to new plannings. You can organize your exercises by muscle group and add details like description or images. Adding your previous marks to your exercises is also possible, helping you migrate from your current notebook. Feynn's interface is designed with simplicity in mind to help you focus on what's more important during your workouts: keeping track of them. Working out with Feynn motivates you to improve your previous marks with visual data representations. The live activities also allow you to glance at your ongoing workouts from the lock screen. Let Feynn replace your notebook for keeping track of your progress at the gym
GymBook
Log workouts, track body measurements, and visualize your fitness progress over time. This app focuses on monitoring your efforts and celebrating achievements to keep you motivated and consistent.
- Weekly workout tracking (weights, reps, sets)
- Body measurements and progress photos
- Progress visualization with charts and lists
- Data stays on device for privacy
- Simple, distraction-free interface
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GymBook is a simple workout tracker for people who already know how they want to train. If you already have a training program, know your exercises, and want a clean way to track progress, GymBook is built for you. Most fitness apps are overloaded with features you do not need. GymBook keeps things simple and focused: - Log your workouts quickly - Track weights, reps, and sets - Follow your own training program - Monitor body measurements over time - See your progress clearly GymBook is made for lifters who do not want unnecessary exercise videos, confusing AI-generated plans, or bloated interfaces. Use GymBook to: - Build and organize your workout program - Track exercise performance - Record training data without distractions - Monitor strength progress over time - Log body measurements in one place - Stay consistent with a clean, functional experience Whether your goal is building muscle, getting stronger, or simply training consistently, GymBook helps you stay focused on what matters. Simple. Functional. Useful.
Screenshots
Verdict
The clearest difference is update cadence: GymBook at every 2 weeks against Feynn's every 4 months. On price, ads, in-app purchases and monetization model 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.
Feynn ships an update every 4 months, GymBook every 2 weeks. Both last shipped on November 4, 2026.
| Parameter | Feynn | GymBook |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 7 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Emilio Cortina Labra | Metehan CANPOLAT |
Customer experience
Feynn
GymBook
In-app purchases
Feynn
No in-app purchases
GymBook
No in-app purchases









